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node-canvas
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Cleanup examples

v1.x
Linus Unnebäck 9 years ago
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22 changed files with 758 additions and 924 deletions
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  1. 196
      examples/clock.js
  2. 47
      examples/crop.js
  3. 53
      examples/font.js
  4. 54
      examples/globalAlpha.js
  5. 44
      examples/gradients.js
  6. 28
      examples/grayscale-image.js
  7. 79
      examples/image-src.js
  8. 190
      examples/kraken.js
  9. 124
      examples/live-clock.js
  10. 57
      examples/multi-page-pdf.js
  11. 36
      examples/pango-glyphs.js
  12. 75
      examples/pdf-images.js
  13. 132
      examples/ray.js
  14. 49
      examples/resize.js
  15. 6
      examples/rhill-voronoi-core-min.js
  16. 33
      examples/small-pdf.js
  17. 33
      examples/small-svg.js
  18. 67
      examples/spark.js
  19. 44
      examples/state.js
  20. 66
      examples/text.js
  21. 264
      examples/voronoi.js
  22. 5
      package.json

196
examples/clock.js
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@ -1,113 +1,113 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var Canvas = require('../lib/canvas')
, canvas = new Canvas(320, 320)
, ctx = canvas.getContext('2d')
, fs = require('fs');
function getX(angle) {
return -Math.sin(angle + Math.PI);
function getX (angle) {
return -Math.sin(angle + Math.PI)
}
function getY(angle) {
return Math.cos(angle + Math.PI);
function getY (angle) {
return Math.cos(angle + Math.PI)
}
function clock(ctx){
var now = new Date();
ctx.clearRect(0,0,320,320);
ctx.save();
ctx.translate(160,160);
ctx.beginPath();
ctx.lineWidth = 14;
ctx.strokeStyle = '#325FA2';
ctx.fillStyle = '#eeeeee';
ctx.arc(0,0,142,0,Math.PI*2,true);
ctx.stroke();
ctx.fill();
ctx.strokeStyle = '#000000';
function clock (ctx) {
var x, y, i
var now = new Date()
ctx.clearRect(0, 0, 320, 320)
ctx.save()
ctx.translate(160, 160)
ctx.beginPath()
ctx.lineWidth = 14
ctx.strokeStyle = '#325FA2'
ctx.fillStyle = '#eeeeee'
ctx.arc(0, 0, 142, 0, Math.PI * 2, true)
ctx.stroke()
ctx.fill()
// Hour marks
ctx.lineWidth = 8;
for (var i=0;i<12;i++){
var x = getX(Math.PI/6*i);
var y = getY(Math.PI/6*i);
ctx.beginPath();
ctx.moveTo(x*100,y*100);
ctx.lineTo(x*125,y*125);
ctx.stroke();
ctx.lineWidth = 8
ctx.strokeStyle = '#000000'
for (i = 0; i < 12; i++) {
x = getX(Math.PI / 6 * i)
y = getY(Math.PI / 6 * i)
ctx.beginPath()
ctx.moveTo(x * 100, y * 100)
ctx.lineTo(x * 125, y * 125)
ctx.stroke()
}
// Minute marks
ctx.lineWidth = 5;
for (i=0;i<60;i++){
if (i%5!=0) {
var x = getX(Math.PI/30*i);
var y = getY(Math.PI/30*i);
ctx.beginPath();
ctx.moveTo(x*117,y*117);
ctx.lineTo(x*125,y*125);
ctx.stroke();
ctx.lineWidth = 5
ctx.strokeStyle = '#000000'
for (i = 0; i < 60; i++) {
if (i % 5 !== 0) {
x = getX(Math.PI / 30 * i)
y = getY(Math.PI / 30 * i)
ctx.beginPath()
ctx.moveTo(x * 117, y * 117)
ctx.lineTo(x * 125, y * 125)
ctx.stroke()
}
}
var sec = now.getSeconds();
var min = now.getMinutes();
var hr = now.getHours();
hr = hr>=12 ? hr-12 : hr;
ctx.fillStyle = "black";
// write Hours
var x = getX(hr*(Math.PI/6) + (Math.PI/360)*min + (Math.PI/21600)*sec);
var y = getY(hr*(Math.PI/6) + (Math.PI/360)*min + (Math.PI/21600)*sec);
ctx.lineWidth = 14;
ctx.beginPath();
ctx.moveTo(x*-20,y*-20);
ctx.lineTo(x*80,y*80);
ctx.stroke();
// write Minutes
var x = getX((Math.PI/30)*min + (Math.PI/1800)*sec);
var y = getY((Math.PI/30)*min + (Math.PI/1800)*sec);
ctx.lineWidth = 10;
ctx.beginPath();
ctx.moveTo(x*-28,y*-28);
ctx.lineTo(x*112,y*112);
ctx.stroke();
var sec = now.getSeconds()
var min = now.getMinutes()
var hr = now.getHours() % 12
ctx.fillStyle = 'black'
// Write hours
x = getX(hr * (Math.PI / 6) + (Math.PI / 360) * min + (Math.PI / 21600) * sec)
y = getY(hr * (Math.PI / 6) + (Math.PI / 360) * min + (Math.PI / 21600) * sec)
ctx.lineWidth = 14
ctx.beginPath()
ctx.moveTo(x * -20, y * -20)
ctx.lineTo(x * 80, y * 80)
ctx.stroke()
// Write minutes
x = getX((Math.PI / 30) * min + (Math.PI / 1800) * sec)
y = getY((Math.PI / 30) * min + (Math.PI / 1800) * sec)
ctx.lineWidth = 10
ctx.beginPath()
ctx.moveTo(x * -28, y * -28)
ctx.lineTo(x * 112, y * 112)
ctx.stroke()
// Write seconds
var x = getX(sec * Math.PI/30);
var y = getY(sec * Math.PI/30);
ctx.strokeStyle = "#D40000";
ctx.fillStyle = "#D40000";
ctx.lineWidth = 6;
ctx.beginPath();
ctx.moveTo(x*-30,y*-30);
ctx.lineTo(x*83,y*83);
ctx.stroke();
ctx.beginPath();
ctx.arc(0,0,10,0,Math.PI*2,true);
ctx.fill();
ctx.beginPath();
ctx.arc(x*95,y*95,10,0,Math.PI*2,true);
ctx.stroke();
ctx.fillStyle = "#555";
ctx.arc(0,0,3,0,Math.PI*2,true);
ctx.fill();
ctx.restore();
x = getX(sec * Math.PI / 30)
y = getY(sec * Math.PI / 30)
ctx.strokeStyle = '#D40000'
ctx.fillStyle = '#D40000'
ctx.lineWidth = 6
ctx.beginPath()
ctx.moveTo(x * -30, y * -30)
ctx.lineTo(x * 83, y * 83)
ctx.stroke()
ctx.beginPath()
ctx.arc(0, 0, 10, 0, Math.PI * 2, true)
ctx.fill()
ctx.beginPath()
ctx.arc(x * 95, y * 95, 10, 0, Math.PI * 2, true)
ctx.stroke()
ctx.fillStyle = '#555'
ctx.arc(0, 0, 3, 0, Math.PI * 2, true)
ctx.fill()
ctx.restore()
}
clock(ctx);
module.exports = clock
var out = fs.createWriteStream(__dirname + '/clock.png')
, stream = canvas.createPNGStream();
if (require.main === module) {
var canvas = new Canvas(320, 320)
var ctx = canvas.getContext('2d')
stream.on('data', function(chunk){
out.write(chunk);
});
clock(ctx)
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'clock.png')))
}

47
examples/crop.js
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@ -1,36 +1,29 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var Image = Canvas.Image
var img = new Image()
var Canvas = require('../lib/canvas')
, Image = Canvas.Image
, fs = require('fs');
img.onerror = function (err) {
throw err
}
var img = new Image;
img.onerror = function(err){
throw err;
};
img.onload = function(){
img.onload = function () {
var w = img.width / 2
, h = img.height / 2
, canvas = new Canvas(w, h)
, ctx = canvas.getContext('2d');
ctx.drawImage(img, 0, 0, w, h, 0, 0, w, h);
var h = img.height / 2
var canvas = new Canvas(w, h)
var ctx = canvas.getContext('2d')
var out = fs.createWriteStream(__dirname + '/crop.jpg');
ctx.drawImage(img, 0, 0, w, h, 0, 0, w, h)
var out = fs.createWriteStream(path.join(__dirname, 'crop.png'))
var stream = canvas.createJPEGStream({
bufsize : 2048,
quality : 80
});
stream.pipe(out);
};
img.src = __dirname + '/images/squid.png';
bufsize: 2048,
quality: 80
})
stream.pipe(out)
}
img.src = path.join(__dirname, 'images', 'squid.png')

53
examples/font.js
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@ -1,50 +1,39 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var Canvas = require('../lib/canvas')
, canvas = new Canvas(320, 320)
, Font = Canvas.Font
, ctx = canvas.getContext('2d')
, fs = require('fs')
, path = require("path");
var Font = Canvas.Font
if (!Font) {
throw new Error('Need to compile with font support');
throw new Error('Need to compile with font support')
}
function fontFile(name) {
return path.join(__dirname, '/pfennigFont/', name);
function fontFile (name) {
return path.join(__dirname, '/pfennigFont/', name)
}
var pfennigFont = new Font('pfennigFont', fontFile('Pfennig.ttf'));
pfennigFont.addFace(fontFile('PfennigBold.ttf'), 'bold');
pfennigFont.addFace(fontFile('PfennigItalic.ttf'), 'normal', 'italic');
pfennigFont.addFace(fontFile('PfennigBoldItalic.ttf'), 'bold', 'italic');
var pfennigFont = new Font('pfennigFont', fontFile('Pfennig.ttf'))
pfennigFont.addFace(fontFile('PfennigBold.ttf'), 'bold')
pfennigFont.addFace(fontFile('PfennigItalic.ttf'), 'normal', 'italic')
pfennigFont.addFace(fontFile('PfennigBoldItalic.ttf'), 'bold', 'italic')
var canvas = new Canvas(320, 320)
var ctx = canvas.getContext('2d')
// Tell the ctx to use the font.
ctx.addFont(pfennigFont);
ctx.font = 'normal normal 50px Helvetica';
ctx.addFont(pfennigFont)
ctx.fillText('Quo Vaids?', 0, 70);
ctx.font = 'normal normal 50px Helvetica'
ctx.font = 'bold 50px pfennigFont';
ctx.fillText('Quo Vaids?', 0, 140);
ctx.fillText('Quo Vaids?', 0, 70)
ctx.font = 'italic 50px pfennigFont';
ctx.fillText('Quo Vaids?', 0, 210);
ctx.font = 'bold 50px pfennigFont'
ctx.fillText('Quo Vaids?', 0, 140)
ctx.font = 'bold italic 50px pfennigFont';
ctx.fillText('Quo Vaids?', 0, 280);
ctx.font = 'italic 50px pfennigFont'
ctx.fillText('Quo Vaids?', 0, 210)
var out = fs.createWriteStream(__dirname + '/font.png');
var stream = canvas.createPNGStream();
ctx.font = 'bold italic 50px pfennigFont'
ctx.fillText('Quo Vaids?', 0, 280)
stream.on('data', function(chunk){
out.write(chunk);
});
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'font.png')))

54
examples/globalAlpha.js
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@ -1,36 +1,32 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var Canvas = require('../lib/canvas')
, canvas = new Canvas(150, 150)
, ctx = canvas.getContext('2d')
, fs = require('fs');
ctx.fillStyle = '#FD0';
ctx.fillRect(0,0,75,75);
ctx.fillStyle = '#6C0';
ctx.fillRect(75,0,75,75);
ctx.fillStyle = '#09F)';
ctx.fillRect(0,75,75,75);
ctx.fillStyle = '#F30';
ctx.fillRect(75,75,150,150);
ctx.fillStyle = '#FFF';
var canvas = new Canvas(150, 150)
var ctx = canvas.getContext('2d')
ctx.fillStyle = '#FD0'
ctx.fillRect(0, 0, 75, 75)
ctx.fillStyle = '#6C0'
ctx.fillRect(75, 0, 75, 75)
ctx.fillStyle = '#09F)'
ctx.fillRect(0, 75, 75, 75)
ctx.fillStyle = '#F30'
ctx.fillRect(75, 75, 150, 150)
ctx.fillStyle = '#FFF'
// set transparency value
ctx.globalAlpha = 0.2;
ctx.globalAlpha = 0.2
// Draw semi transparent circles
for (i=0;i<7;i++){
ctx.beginPath();
ctx.arc(75,75,10+10*i,0,Math.PI*2,true);
ctx.fill();
for (var i = 0; i < 7; i++) {
ctx.beginPath()
ctx.arc(75, 75, 10 + 10 * i, 0, Math.PI * 2, true)
ctx.fill()
}
var out = fs.createWriteStream(__dirname + '/globalAlpha.png')
, stream = canvas.createPNGStream();
stream.on('data', function(chunk){
out.write(chunk);
});
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'globalAlpha.png')))

44
examples/gradients.js
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@ -1,35 +1,27 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var Canvas = require('../lib/canvas')
, canvas = new Canvas(320, 320)
, ctx = canvas.getContext('2d')
, fs = require('fs');
var canvas = new Canvas(320, 320)
var ctx = canvas.getContext('2d')
// Create gradients
var lingrad = ctx.createLinearGradient(0,0,0,150);
lingrad.addColorStop(0, '#00ABEB');
lingrad.addColorStop(0.5, '#fff');
lingrad.addColorStop(0.5, '#26C000');
lingrad.addColorStop(1, '#fff');
var lingrad = ctx.createLinearGradient(0, 0, 0, 150)
lingrad.addColorStop(0, '#00ABEB')
lingrad.addColorStop(0.5, '#fff')
lingrad.addColorStop(0.5, '#26C000')
lingrad.addColorStop(1, '#fff')
var lingrad2 = ctx.createLinearGradient(0,50,0,95);
lingrad2.addColorStop(0.5, '#000');
lingrad2.addColorStop(1, 'rgba(0,0,0,0)');
var lingrad2 = ctx.createLinearGradient(0, 50, 0, 95)
lingrad2.addColorStop(0.5, '#000')
lingrad2.addColorStop(1, 'rgba(0,0,0,0)')
// assign gradients to fill and stroke styles
ctx.fillStyle = lingrad;
ctx.strokeStyle = lingrad2;
ctx.fillStyle = lingrad
ctx.strokeStyle = lingrad2
// draw shapes
ctx.fillRect(10,10,130,130);
ctx.strokeRect(50,50,50,50);
var out = fs.createWriteStream(__dirname + '/gradients.png')
, stream = canvas.createPNGStream();
ctx.fillRect(10, 10, 130, 130)
ctx.strokeRect(50, 50, 50, 50)
stream.on('data', function(chunk){
out.write(chunk);
});
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'gradients.png')))

28
examples/grayscale-image.js
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@ -1,22 +1,14 @@
/**
* Passing grayscale image through canvas. Image should remain a gray square.
* If image is distorted with lines, then grayscale images are being distorted.
*/
var Canvas = require('../lib/canvas')
, Image = Canvas.Image
, canvas = new Canvas(288, 288)
, ctx = canvas.getContext('2d')
, fs = require('fs');
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
var grayScaleImage = fs.readFileSync(__dirname + '/images/grayscaleImage.jpg');
img = new Image;
img.src = grayScaleImage;
var Image = Canvas.Image
var canvas = new Canvas(288, 288)
var ctx = canvas.getContext('2d')
ctx.drawImage(img, 0, 0);
var img = new Image()
img.src = fs.readFileSync(path.join(__dirname, 'images', 'grayscaleImage.jpg'))
var out = fs.createWriteStream(__dirname + '/passedThroughGrayscale.jpg')
, stream = canvas.createJPEGStream();
ctx.drawImage(img, 0, 0)
stream.on('data', function(chunk){
out.write(chunk);
});
canvas.createJPEGStream().pipe(fs.createWriteStream(path.join(__dirname, 'passedThroughGrayscale.jpg')))

79
examples/image-src.js
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@ -1,45 +1,36 @@
var fs = require('fs')
var path = require(path)
var Canvas = require('..')
/**
* Module dependencies.
*/
var Canvas = require('../lib/canvas')
, Image = Canvas.Image
, canvas = new Canvas(200, 200)
, ctx = canvas.getContext('2d')
, fs = require('fs');
ctx.fillRect(0,0,150,150);
ctx.save();
ctx.fillStyle = '#09F'
ctx.fillRect(15,15,120,120);
ctx.save();
ctx.fillStyle = '#FFF'
ctx.globalAlpha = 0.5;
ctx.fillRect(30,30,90,90);
ctx.restore();
ctx.fillRect(45,45,60,60);
ctx.restore();
ctx.fillRect(60,60,30,30);
var img = new Image;
img.src = canvas.toBuffer();
ctx.drawImage(img, 0, 0, 50, 50);
ctx.drawImage(img, 50, 0, 50, 50);
ctx.drawImage(img, 100, 0, 50, 50);
var squid = fs.readFileSync(__dirname + '/images/squid.png');
img = new Image;
img.src = squid;
ctx.drawImage(img, 30, 50, img.width / 4, img.height / 4);
var out = fs.createWriteStream(__dirname + '/image-src.png')
, stream = canvas.createPNGStream();
stream.on('data', function(chunk){
out.write(chunk);
});
var Image = Canvas.Image
var canvas = new Canvas(200, 200)
var ctx = canvas.getContext('2d')
ctx.fillRect(0, 0, 150, 150)
ctx.save()
ctx.fillStyle = '#09F'
ctx.fillRect(15, 15, 120, 120)
ctx.save()
ctx.fillStyle = '#FFF'
ctx.globalAlpha = 0.5
ctx.fillRect(30, 30, 90, 90)
ctx.restore()
ctx.fillRect(45, 45, 60, 60)
ctx.restore()
ctx.fillRect(60, 60, 30, 30)
var img = new Image()
img.src = canvas.toBuffer()
ctx.drawImage(img, 0, 0, 50, 50)
ctx.drawImage(img, 50, 0, 50, 50)
ctx.drawImage(img, 100, 0, 50, 50)
img = new Image()
img.src = fs.readFileSync(path.join(__dirname, 'images', 'squid.png'))
ctx.drawImage(img, 30, 50, img.width / 4, img.height / 4)
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'image-src.png')))

190
examples/kraken.js
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@ -1,98 +1,104 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var Canvas = require('../lib/canvas')
, Image = Canvas.Image
, canvas = new Canvas(400, 267)
, ctx = canvas.getContext('2d')
, fs = require('fs');
var img = new Image;
img.onload = function(){
ctx.drawImage(img,0,0);
};
img.src = __dirname + '/images/squid.png';
var sigma = 10; // radius
var kernel, kernelSize, kernelSum;
buildKernel();
function buildKernel() {
var ss = sigma * sigma;
var factor = 2 * Math.PI * ss;
kernel = [];
kernel.push([]);
var i = 0, j;
do {
var g = Math.exp(-(i * i) / (2 * ss)) / factor;
if (g < 1e-3) break;
kernel[0].push(g);
++i;
} while (i < 7);
kernelSize = i;
for (j = 1; j < kernelSize; ++j) {
kernel.push([]);
for (i = 0; i < kernelSize; ++i) {
var g = Math.exp(-(i * i + j * j) / (2 * ss)) / factor;
kernel[j].push(g);
}
}
kernelSum = 0;
for (j = 1 - kernelSize; j < kernelSize; ++j) {
for (i = 1 - kernelSize; i < kernelSize; ++i) {
kernelSum += kernel[Math.abs(j)][Math.abs(i)];
}
}
var Image = Canvas.Image
var canvas = new Canvas(400, 267)
var ctx = canvas.getContext('2d')
var img = new Image()
img.onload = function () {
ctx.drawImage(img, 0, 0)
}
img.src = path.join(__dirname, 'images', 'squid.png')
var sigma = 10 // radius
var kernel, kernelSize, kernelSum
function buildKernel () {
var i, j, g
var ss = sigma * sigma
var factor = 2 * Math.PI * ss
kernel = [[]]
i = 0
do {
g = Math.exp(-(i * i) / (2 * ss)) / factor
if (g < 1e-3) break
kernel[0].push(g)
++i
} while (i < 7)
kernelSize = i
for (j = 1; j < kernelSize; ++j) {
kernel.push([])
for (i = 0; i < kernelSize; ++i) {
g = Math.exp(-(i * i + j * j) / (2 * ss)) / factor
kernel[j].push(g)
}
}
kernelSum = 0
for (j = 1 - kernelSize; j < kernelSize; ++j) {
for (i = 1 - kernelSize; i < kernelSize; ++i) {
kernelSum += kernel[Math.abs(j)][Math.abs(i)]
}
}
}
function blurTest() {
console.log('... running');
var imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
var width = imgData.width, height = imgData.height;
var data = imgData.data;
var len = data.length;
var startTime = (new Date()).getTime();
for (var y = 0; y < height; ++y) {
for (var x = 0; x < width; ++x) {
var r = 0, g = 0, b = 0, a = 0;
for (j = 1 - kernelSize; j < kernelSize; ++j) {
if (y + j < 0 || y + j >= height) continue;
for (i = 1 - kernelSize; i < kernelSize; ++i) {
if (x + i < 0 || x + i >= width) continue;
r += data[4 * ((y + j) * width + (x + i)) + 0] * kernel[Math.abs(j)][Math.abs(i)];
g += data[4 * ((y + j) * width + (x + i)) + 1] * kernel[Math.abs(j)][Math.abs(i)];
b += data[4 * ((y + j) * width + (x + i)) + 2] * kernel[Math.abs(j)][Math.abs(i)];
a += data[4 * ((y + j) * width + (x + i)) + 3] * kernel[Math.abs(j)][Math.abs(i)];
}
}
data[4 * (y * width + x) + 0] = r / kernelSum;
data[4 * (y * width + x) + 1] = g / kernelSum;
data[4 * (y * width + x) + 2] = b / kernelSum;
data[4 * (y * width + x) + 3] = a / kernelSum;
}
}
var finishTime = Date.now() - startTime;
for (var i = 0; i < data.length; i++) {
imgData.data[i] = data[i];
}
//imgData.data = data;
ctx.putImageData(imgData, 0, 0);
console.log('... finished in %dms', finishTime);
function blurTest () {
var x, y, i, j
var r, g, b, a
console.log('... running')
var imgData = ctx.getImageData(0, 0, canvas.width, canvas.height)
var data = imgData.data
var width = imgData.width
var height = imgData.height
var startTime = (new Date()).getTime()
for (y = 0; y < height; ++y) {
for (x = 0; x < width; ++x) {
r = 0
g = 0
b = 0
a = 0
for (j = 1 - kernelSize; j < kernelSize; ++j) {
if (y + j < 0 || y + j >= height) continue
for (i = 1 - kernelSize; i < kernelSize; ++i) {
if (x + i < 0 || x + i >= width) continue
r += data[4 * ((y + j) * width + (x + i)) + 0] * kernel[Math.abs(j)][Math.abs(i)]
g += data[4 * ((y + j) * width + (x + i)) + 1] * kernel[Math.abs(j)][Math.abs(i)]
b += data[4 * ((y + j) * width + (x + i)) + 2] * kernel[Math.abs(j)][Math.abs(i)]
a += data[4 * ((y + j) * width + (x + i)) + 3] * kernel[Math.abs(j)][Math.abs(i)]
}
}
data[4 * (y * width + x) + 0] = r / kernelSum
data[4 * (y * width + x) + 1] = g / kernelSum
data[4 * (y * width + x) + 2] = b / kernelSum
data[4 * (y * width + x) + 3] = a / kernelSum
}
}
var finishTime = Date.now() - startTime
for (i = 0; i < data.length; i++) {
imgData.data[i] = data[i]
}
ctx.putImageData(imgData, 0, 0)
console.log('... finished in %dms', finishTime)
}
blurTest();
var out = fs.createWriteStream(__dirname + '/kraken.png')
, stream = canvas.createPNGStream();
buildKernel()
blurTest()
stream.on('data', function(chunk){
out.write(chunk);
});
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'kraken.png')))

124
examples/live-clock.js
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@ -1,113 +1,19 @@
var http = require('http')
var Canvas = require('..')
/**
* Module dependencies.
*/
var clock = require('./clock')
var Canvas = require('../lib/canvas')
, canvas = new Canvas(320, 320)
, ctx = canvas.getContext('2d')
, http = require('http');
function getX(angle) {
return -Math.sin(angle + Math.PI);
}
function getY(angle) {
return Math.cos(angle + Math.PI);
}
function clock(ctx){
var now = new Date();
ctx.clearRect(0,0,320,320);
ctx.save();
ctx.translate(160,160);
ctx.beginPath();
ctx.lineWidth = 14;
ctx.strokeStyle = '#325FA2';
ctx.fillStyle = '#eeeeee';
ctx.arc(0,0,142,0,Math.PI*2,true);
ctx.stroke();
ctx.fill();
ctx.strokeStyle = '#000000';
// Hour marks
ctx.lineWidth = 8;
for (var i=0;i<12;i++){
var x = getX(Math.PI/6*i);
var y = getY(Math.PI/6*i);
ctx.beginPath();
ctx.moveTo(x*100,y*100);
ctx.lineTo(x*125,y*125);
ctx.stroke();
}
// Minute marks
ctx.lineWidth = 5;
for (i=0;i<60;i++){
if (i%5!=0) {
var x = getX(Math.PI/30*i);
var y = getY(Math.PI/30*i);
ctx.beginPath();
ctx.moveTo(x*117,y*117);
ctx.lineTo(x*125,y*125);
ctx.stroke();
}
}
var sec = now.getSeconds();
var min = now.getMinutes();
var hr = now.getHours();
hr = hr>=12 ? hr-12 : hr;
ctx.fillStyle = "black";
// write Hours
var x = getX(hr*(Math.PI/6) + (Math.PI/360)*min + (Math.PI/21600)*sec);
var y = getY(hr*(Math.PI/6) + (Math.PI/360)*min + (Math.PI/21600)*sec);
ctx.lineWidth = 14;
ctx.beginPath();
ctx.moveTo(x*-20,y*-20);
ctx.lineTo(x*80,y*80);
ctx.stroke();
// write Minutes
var x = getX((Math.PI/30)*min + (Math.PI/1800)*sec);
var y = getY((Math.PI/30)*min + (Math.PI/1800)*sec);
ctx.lineWidth = 10;
ctx.beginPath();
ctx.moveTo(x*-28,y*-28);
ctx.lineTo(x*112,y*112);
ctx.stroke();
// Write seconds
var x = getX(sec * Math.PI/30);
var y = getY(sec * Math.PI/30);
ctx.strokeStyle = "#D40000";
ctx.fillStyle = "#D40000";
ctx.lineWidth = 6;
ctx.beginPath();
ctx.moveTo(x*-30,y*-30);
ctx.lineTo(x*83,y*83);
ctx.stroke();
ctx.beginPath();
ctx.arc(0,0,10,0,Math.PI*2,true);
ctx.fill();
ctx.beginPath();
ctx.arc(x*95,y*95,10,0,Math.PI*2,true);
ctx.stroke();
ctx.fillStyle = "#555";
ctx.arc(0,0,3,0,Math.PI*2,true);
ctx.fill();
ctx.restore();
}
var canvas = new Canvas(320, 320)
var ctx = canvas.getContext('2d')
http.createServer(function (req, res) {
clock(ctx);
res.writeHead(200, { 'Content-Type': 'text/html' });
res.end(''
+ '<meta http-equiv="refresh" content="1;" />'
+ '<img src="' + canvas.toDataURL() + '" />');
}).listen(3000);
console.log('Server started on port 3000');
clock(ctx)
res.writeHead(200, { 'Content-Type': 'text/html' })
res.end(
'<meta http-equiv="refresh" content="1;" />' +
'<img src="' + canvas.toDataURL() + '" />'
)
}).listen(3000, function () {
console.log('Server started on port 3000')
})

57
examples/multi-page-pdf.js
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@ -1,39 +1,42 @@
var fs = require('fs')
var Canvas = require('..')
var Canvas = require('../')
, canvas = new Canvas(500, 500, 'pdf')
, ctx = canvas.getContext('2d')
, fs = require('fs');
var canvas = new Canvas(500, 500, 'pdf')
var ctx = canvas.getContext('2d')
var x, y;
var x, y
function reset() {
x = 50;
y = 80;
function reset () {
x = 50
y = 80
}
function h1(str) {
ctx.font = '22px Helvetica';
ctx.fillText(str, x, y);
function h1 (str) {
ctx.font = '22px Helvetica'
ctx.fillText(str, x, y)
}
function p(str) {
ctx.font = '10px Arial';
ctx.fillText(str, x, y += 20);
function p (str) {
ctx.font = '10px Arial'
ctx.fillText(str, x, (y += 20))
}
reset();
h1('PDF demo');
p('Multi-page PDF demonstration');
ctx.addPage();
reset()
h1('PDF demo')
p('Multi-page PDF demonstration')
ctx.addPage()
reset();
h1('Page #2');
p('This is the second page');
ctx.addPage();
reset()
h1('Page #2')
p('This is the second page')
ctx.addPage()
reset();
h1('Page #3');
p('This is the third page');
reset()
h1('Page #3')
p('This is the third page')
fs.writeFile('out.pdf', canvas.toBuffer());
console.log('created out.pdf');
fs.writeFile('out.pdf', canvas.toBuffer(), function (err) {
if (err) throw err
console.log('created out.pdf')
})

36
examples/pango-glyphs.js
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@ -1,30 +1,22 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var canvas = new Canvas(400, 100)
var ctx = canvas.getContext('2d')
var Canvas = require('../lib/canvas')
, canvas = new Canvas(400, 100)
, ctx = canvas.getContext('2d')
, fs = require('fs');
ctx.globalAlpha = 1
ctx.font = 'normal 16px Impact'
ctx.globalAlpha = 1;
ctx.font = 'normal 16px Impact';
ctx.textBaseline = 'top';
ctx.textBaseline = 'top'
// Note this demo depends node-canvas being installed with pango support,
// and your system having installed fonts supporting the glyphs.
ctx.fillStyle = '#000';
ctx.fillText("English: Some text in Impact.", 10, 10);
ctx.fillText("Japanese: 図書館の中では、静かにする。", 10, 30);
ctx.fillText("Arabic: اللغة العربية هي أكثر اللغات تحدثا ضمن", 10, 50);
ctx.fillText("Korean: 모타는사라미 못하는 사람이", 10, 70);
var out = fs.createWriteStream(__dirname + '/pango-glyphs.png')
, stream = canvas.createPNGStream();
ctx.fillStyle = '#000'
ctx.fillText('English: Some text in Impact.', 10, 10)
ctx.fillText('Japanese: 図書館の中では、静かにする。', 10, 30)
ctx.fillText('Arabic: اللغة العربية هي أكثر اللغات تحدثا ضمن', 10, 50)
ctx.fillText('Korean: 모타는사라미 못하는 사람이', 10, 70)
stream.on('data', function(chunk){
out.write(chunk);
});
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'pango-glyphs.png')))

75
examples/pdf-images.js
View File

@ -1,47 +1,50 @@
var fs = require('fs')
var Canvas = require('..')
var Canvas = require('../')
, Image = Canvas.Image
, canvas = new Canvas(500, 500, 'pdf')
, ctx = canvas.getContext('2d')
, fs = require('fs');
var Image = Canvas.Image
var canvas = new Canvas(500, 500, 'pdf')
var ctx = canvas.getContext('2d')
var x, y;
var x, y
function reset() {
x = 50;
y = 80;
function reset () {
x = 50
y = 80
}
function h1(str) {
ctx.font = '22px Helvetica';
ctx.fillText(str, x, y);
function h1 (str) {
ctx.font = '22px Helvetica'
ctx.fillText(str, x, y)
}
function p(str) {
ctx.font = '10px Arial';
ctx.fillText(str, x, y += 20);
function p (str) {
ctx.font = '10px Arial'
ctx.fillText(str, x, (y += 20))
}
function img(src) {
var img = new Image;
img.src = src;
ctx.drawImage(img, x, y += 20);
y += img.height;
function img (src) {
var img = new Image()
img.src = src
ctx.drawImage(img, x, (y += 20))
y += img.height
}
reset();
h1('PDF image demo');
p('This is an image embedded in a PDF');
img('examples/images/squid.png');
p('Figure 1.0 - Some squid thing');
ctx.addPage();
reset();
h1('Lime cat');
p('This is a pretty sweet cat');
img('examples/images/lime-cat.jpg');
p('Figure 1.1 - Lime cat is awesome');
ctx.addPage();
fs.writeFile('out.pdf', canvas.toBuffer());
console.log('created out.pdf');
reset()
h1('PDF image demo')
p('This is an image embedded in a PDF')
img('examples/images/squid.png')
p('Figure 1.0 - Some squid thing')
ctx.addPage()
reset()
h1('Lime cat')
p('This is a pretty sweet cat')
img('examples/images/lime-cat.jpg')
p('Figure 1.1 - Lime cat is awesome')
ctx.addPage()
fs.writeFile('out.pdf', canvas.toBuffer(), function (err) {
if (err) throw err
console.log('created out.pdf')
})

132
examples/ray.js
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@ -1,85 +1,85 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var canvas = new Canvas(243 * 4, 243)
var ctx = canvas.getContext('2d')
var Canvas = require('../lib/canvas')
, canvas = new Canvas(243 * 4, 243)
, ctx = canvas.getContext('2d')
, fs = require('fs');
function render(level){
ctx.fillStyle = getPointColour(122,122);
ctx.fillRect(0,0,240,240);
renderLevel(level,81,0);
function render (level) {
ctx.fillStyle = getPointColour(122, 122)
ctx.fillRect(0, 0, 240, 240)
renderLevel(level, 81, 0)
}
function renderLevel(minimumLevel,level,y){
for (var x=0; x < 243 / level; ++x) {
drawBlock(x,y,level);
function renderLevel (minimumLevel, level, y) {
var x
for (x = 0; x < 243 / level; ++x) {
drawBlock(x, y, level)
}
for (var x=0; x < 243 / level; x+=3){
drawBlock(x,y+1,level);
drawBlock(x+2,y+1,level);
for (x = 0; x < 243 / level; x += 3) {
drawBlock(x, y + 1, level)
drawBlock(x + 2, y + 1, level)
}
for (var x=0; x < 243 / level; ++x){
drawBlock(x,y+2,level);
for (x = 0; x < 243 / level; ++x) {
drawBlock(x, y + 2, level)
}
if ((y += 3) >= 243 / level){
y=0;
level /= 3;
if ((y += 3) >= 243 / level) {
y = 0
level /= 3
}
if (level >= minimumLevel){
renderLevel(minimumLevel, level, y);
if (level >= minimumLevel) {
renderLevel(minimumLevel, level, y)
}
}
function drawBlock(x,y,level){
function drawBlock (x, y, level) {
ctx.fillStyle = getPointColour(
x * level + (level-1) / 2
, y * level + (level-1) / 2);
x * level + (level - 1) / 2,
y * level + (level - 1) / 2
)
ctx.fillRect(
x * level
, y * level
, level
, level
);
x * level,
y * level,
level,
level
)
}
function getPointColour(x,y){
x= x / 121.5 - 1;
y= -y / 121.5 + 1;
var x2y2 = x * x + y * y;
if (x2y2 > 1){
return '#000';
} else {
var root = Math.sqrt(1 - x2y2);
var x3d = x * 0.7071067812 + root / 2 - y / 2;
var y3d = x * 0.7071067812 - root / 2 + y / 2;
var z3d = 0.7071067812 * root + 0.7071067812 * y;
var brightness= -x / 2 + root * 0.7071067812 + y / 2;
if (brightness < 0) brightness = 0;
return ''
+ 'rgb(' + Math.round(brightness * 127.5 * (1 - y3d))
+ ',' + Math.round(brightness * 127.5 * (x3d + 1))
+ ',' + Math.round(brightness * 127.5 * (z3d + 1))
+ ')'
;
}
function getPointColour (x, y) {
x = x / 121.5 - 1
y = -y / 121.5 + 1
var x2y2 = x * x + y * y
if (x2y2 > 1) {
return '#000'
}
var root = Math.sqrt(1 - x2y2)
var x3d = x * 0.7071067812 + root / 2 - y / 2
var y3d = x * 0.7071067812 - root / 2 + y / 2
var z3d = 0.7071067812 * root + 0.7071067812 * y
var brightness = -x / 2 + root * 0.7071067812 + y / 2
if (brightness < 0) brightness = 0
var r = Math.round(brightness * 127.5 * (1 - y3d))
var g = Math.round(brightness * 127.5 * (x3d + 1))
var b = Math.round(brightness * 127.5 * (z3d + 1))
return 'rgb(' + r + ', ' + g + ', ' + b + ')'
}
var start = new Date;
render(10);
ctx.translate(243,0);
render(6);
ctx.translate(243,0);
render(3);
ctx.translate(243,0);
render(1);
console.log('Rendered in %s seconds', (new Date - start) / 1000);
var start = new Date()
render(10)
ctx.translate(243, 0)
render(6)
ctx.translate(243, 0)
render(3)
ctx.translate(243, 0)
render(1)
console.log('Rendered in %s seconds', (new Date() - start) / 1000)
canvas.toBuffer(function(err, buf){
if (err) throw err;
fs.writeFile(__dirname + '/ray.png', buf);
});
canvas.pngStream().pipe(fs.createWriteStream(path.join(__dirname, 'ray.png')))

49
examples/resize.js
View File

@ -1,34 +1,31 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var Image = Canvas.Image
var Canvas = require('../lib/canvas')
, Image = Canvas.Image
, fs = require('fs');
var img = new Image()
var start = new Date()
var img = new Image
, start = new Date;
img.onerror = function (err) {
throw err
}
img.onerror = function(err){
throw err;
};
img.onload = function () {
var width = 100
var height = 100
var canvas = new Canvas(width, height)
var ctx = canvas.getContext('2d')
var out = fs.createWriteStream(path.join(__dirname, 'resize.png'))
img.onload = function(){
var width = 100;
var height = 100;
var canvas = new Canvas(width, height);
var ctx = canvas.getContext('2d');
ctx.imageSmoothingEnabled = true
ctx.drawImage(img, 0, 0, width, height)
ctx.imageSmoothingEnabled = true;
ctx.drawImage(img, 0, 0, width, height);
canvas.pngStream().pipe(out)
canvas.toBuffer(function(err, buf){
fs.writeFile(__dirname + '/resize.png', buf, function(){
console.log('Resized and saved in %dms', new Date - start);
});
});
};
img.src = process.argv[2] || __dirname + '/images/squid.png';
out.on('finish', function () {
console.log('Resized and saved in %dms', new Date() - start)
})
}
img.src = (process.argv[2] || path.join(__dirname, 'images', 'squid.png'))

6
examples/rhill-voronoi-core-min.js
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33
examples/small-pdf.js
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@ -1,22 +1,25 @@
var fs = require('fs')
var Canvas = require('..')
var Canvas = require('../')
, canvas = new Canvas(400, 200, 'pdf')
, ctx = canvas.getContext('2d')
, fs = require('fs');
var canvas = new Canvas(400, 200, 'pdf')
var ctx = canvas.getContext('2d')
var y = 80
, x = 50;
var x = 50
ctx.font = '22px Helvetica';
ctx.fillText('node-canvas pdf', x, y);
ctx.font = '22px Helvetica'
ctx.fillText('node-canvas pdf', x, y)
ctx.font = '10px Arial';
ctx.fillText('Just a quick example of PDFs with node-canvas', x, y += 20);
ctx.font = '10px Arial'
ctx.fillText('Just a quick example of PDFs with node-canvas', x, (y += 20))
ctx.globalAlpha = .5;
ctx.fillRect(x, y += 20, 10, 10);
ctx.fillRect(x += 20, y, 10, 10);
ctx.fillRect(x += 20, y, 10, 10);
ctx.globalAlpha = 0.5
ctx.fillRect(x, (y += 20), 10, 10)
ctx.fillRect((x += 20), y, 10, 10)
ctx.fillRect((x += 20), y, 10, 10)
fs.writeFile('out.pdf', canvas.toBuffer());
console.log('created out.pdf');
fs.writeFile('out.pdf', canvas.toBuffer(), function (err) {
if (err) throw err
console.log('created out.pdf')
})

33
examples/small-svg.js
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@ -1,22 +1,25 @@
var fs = require('fs')
var Canvas = require('..')
var Canvas = require('../')
, canvas = new Canvas(400, 200, 'svg')
, ctx = canvas.getContext('2d')
, fs = require('fs');
var canvas = new Canvas(400, 200, 'svg')
var ctx = canvas.getContext('2d')
var y = 80
, x = 50;
var x = 50
ctx.font = '22px Helvetica';
ctx.fillText('node-canvas SVG', x, y);
ctx.font = '22px Helvetica'
ctx.fillText('node-canvas SVG', x, y)
ctx.font = '10px Arial';
ctx.fillText('Just a quick example of SVGs with node-canvas', x, y += 20);
ctx.font = '10px Arial'
ctx.fillText('Just a quick example of SVGs with node-canvas', x, (y += 20))
ctx.globalAlpha = .5;
ctx.fillRect(x, y += 20, 10, 10);
ctx.fillRect(x += 20, y, 10, 10);
ctx.fillRect(x += 20, y, 10, 10);
ctx.globalAlpha = 0.5
ctx.fillRect(x, (y += 20), 10, 10)
ctx.fillRect((x += 20), y, 10, 10)
ctx.fillRect((x += 20), y, 10, 10)
fs.writeFile('out.svg', canvas.toBuffer());
console.log('created out.svg');
fs.writeFile('out.svg', canvas.toBuffer(), function (err) {
if (err) throw err
console.log('created out.svg')
})

67
examples/spark.js
View File

@ -1,46 +1,33 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var Canvas = require('../lib/canvas')
, canvas = new Canvas(40, 15)
, ctx = canvas.getContext('2d')
, fs = require('fs');
Object.defineProperty(Array.prototype, 'max', {
get: function(){
var max = 0;
for (var i = 0, len = this.length; i < len; ++i) {
var n = this[i];
if (n > max) max = n;
}
return max;
}
});
function spark(ctx, data) {
var canvas = new Canvas(40, 15)
var ctx = canvas.getContext('2d')
function spark (ctx, data) {
var len = data.length
, pad = 1
, width = ctx.canvas.width
, height = ctx.canvas.height
, barWidth = width / len
, max = data.max;
ctx.fillStyle = 'rgba(0,0,255,0.5)';
ctx.strokeStyle = 'red';
ctx.lineWidth = 1;
data.forEach(function(n, i){
var pad = 1
var width = ctx.canvas.width
var height = ctx.canvas.height
var barWidth = width / len
var max = Math.max.apply(null, data)
ctx.fillStyle = 'rgba(0,0,255,0.5)'
ctx.strokeStyle = 'red'
ctx.lineWidth = 1
data.forEach(function (n, i) {
var x = i * barWidth + pad
, y = height * (n / max)
ctx.lineTo(x, height - y);
ctx.fillRect(x, height, barWidth - pad, -y);
});
ctx.stroke();
var y = height * (n / max)
ctx.lineTo(x, height - y)
ctx.fillRect(x, height, barWidth - pad, -y)
})
ctx.stroke()
}
spark(ctx, [1,2,4,5,10,4,2,5,4,3,3,2]);
spark(ctx, [1, 2, 4, 5, 10, 4, 2, 5, 4, 3, 3, 2])
canvas.toBuffer(function(err, buf){
if (err) throw err;
fs.writeFile(__dirname + '/spark.png', buf);
});
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'spark.png')))

44
examples/state.js
View File

@ -1,33 +1,25 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var canvas = new Canvas(150, 150)
var ctx = canvas.getContext('2d')
var Canvas = require('../lib/canvas')
, canvas = new Canvas(150, 150)
, ctx = canvas.getContext('2d')
, fs = require('fs');
ctx.fillRect(0, 0, 150, 150) // Draw a rectangle with default settings
ctx.save() // Save the default state
ctx.fillRect(0,0,150,150); // Draw a rectangle with default settings
ctx.save(); // Save the default state
ctx.fillStyle = '#09F' // Make changes to the settings
ctx.fillRect(15, 15, 120, 120) // Draw a rectangle with new settings
ctx.fillStyle = '#09F' // Make changes to the settings
ctx.fillRect(15,15,120,120); // Draw a rectangle with new settings
ctx.save() // Save the current state
ctx.fillStyle = '#FFF' // Make changes to the settings
ctx.globalAlpha = 0.5
ctx.fillRect(30, 30, 90, 90) // Draw a rectangle with new settings
ctx.save(); // Save the current state
ctx.fillStyle = '#FFF' // Make changes to the settings
ctx.globalAlpha = 0.5;
ctx.fillRect(30,30,90,90); // Draw a rectangle with new settings
ctx.restore() // Restore previous state
ctx.fillRect(45, 45, 60, 60) // Draw a rectangle with restored settings
ctx.restore(); // Restore previous state
ctx.fillRect(45,45,60,60); // Draw a rectangle with restored settings
ctx.restore() // Restore original state
ctx.fillRect(60, 60, 30, 30) // Draw a rectangle with restored settings
ctx.restore(); // Restore original state
ctx.fillRect(60,60,30,30); // Draw a rectangle with restored settings
var out = fs.createWriteStream(__dirname + '/state.png')
, stream = canvas.createPNGStream();
stream.on('data', function(chunk){
out.write(chunk);
});
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'state.png')))

66
examples/text.js
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@ -1,50 +1,44 @@
var fs = require('fs')
var path = require('path')
var Canvas = require('..')
/**
* Module dependencies.
*/
var canvas = new Canvas(200, 200)
var ctx = canvas.getContext('2d')
var Canvas = require('../lib/canvas')
, canvas = new Canvas(200, 200)
, ctx = canvas.getContext('2d')
, fs = require('fs');
ctx.globalAlpha = 0.2
ctx.globalAlpha = .2;
ctx.strokeRect(0, 0, 200, 200)
ctx.lineTo(0, 100)
ctx.lineTo(200, 100)
ctx.stroke()
ctx.strokeRect(0,0,200,200);
ctx.lineTo(0,100);
ctx.lineTo(200,100);
ctx.stroke();
ctx.beginPath()
ctx.lineTo(100, 0)
ctx.lineTo(100, 200)
ctx.stroke()
ctx.beginPath();
ctx.lineTo(100,0);
ctx.lineTo(100,200);
ctx.stroke();
ctx.globalAlpha = 1
ctx.font = 'normal 40px Impact, serif'
ctx.globalAlpha = 1;
ctx.font = 'normal 40px Impact, serif';
ctx.rotate(0.5)
ctx.translate(20, -40)
ctx.rotate(.5);
ctx.translate(20,-40);
ctx.lineWidth = 1
ctx.strokeStyle = '#ddd'
ctx.strokeText('Wahoo', 50, 100)
ctx.lineWidth = 1;
ctx.strokeStyle = '#ddd';
ctx.strokeText("Wahoo", 50, 100);
ctx.fillStyle = '#000'
ctx.fillText('Wahoo', 49, 99)
ctx.fillStyle = '#000';
ctx.fillText("Wahoo", 49, 99);
var m = ctx.measureText('Wahoo')
var m = ctx.measureText("Wahoo");
ctx.strokeStyle = '#f00'
ctx.strokeStyle = '#f00';
ctx.strokeRect(49 + m.actualBoundingBoxLeft,
ctx.strokeRect(
49 + m.actualBoundingBoxLeft,
99 - m.actualBoundingBoxAscent,
m.actualBoundingBoxRight - m.actualBoundingBoxLeft,
m.actualBoundingBoxAscent + m.actualBoundingBoxDescent);
var out = fs.createWriteStream(__dirname + '/text.png')
, stream = canvas.createPNGStream();
m.actualBoundingBoxAscent + m.actualBoundingBoxDescent
)
stream.on('data', function(chunk){
out.write(chunk);
});
canvas.createPNGStream().pipe(fs.createWriteStream(path.join(__dirname, 'text.png')))

264
examples/voronoi.js
View File

@ -1,140 +1,134 @@
var http = require('http')
var Canvas = require('..')
/**
* Module dependencies.
*/
var canvas = new Canvas(1920, 1200)
var ctx = canvas.getContext('2d')
var Canvas = require('../lib/canvas')
, canvas = new Canvas(1920, 1200)
, ctx = canvas.getContext('2d')
, http = require('http')
, fs = require('fs');
var voronoiFactory = require('./rhill-voronoi-core-min.js');
var voronoiFactory = require('./rhill-voronoi-core-min')
http.createServer(function (req, res) {
var x, y, v, iHalfedge
var voronoi = voronoiFactory()
, start = new Date;
var bbox = { xl: 0, xr: canvas.width, yt: 0, yb: canvas.height };
for (var i =0 ;i<340;i++)
{
var x = Math.random()*canvas.width;
var y = Math.random()*canvas.height;
voronoi.addSites([{x:x,y:y}]);
};
var diagram = voronoi.compute(bbox);
ctx.beginPath();
ctx.rect(0,0,canvas.width,canvas.height);
ctx.fillStyle = '#fff';
ctx.fill();
ctx.strokeStyle = 'black';
ctx.stroke();
// voronoi
ctx.strokeStyle='rgba(255,255,255,0.5)';
ctx.lineWidth = 4;
// edges
var edges = diagram.edges;
var nEdges = edges.length;
var sites = diagram.sites;
var nSites = sites.length;
for (var iSite=nSites-1; iSite>=0; iSite-=1)
{
site = sites[iSite];
ctx.rect(site.x-0.5,site.y-0.5,1,1);
// ctx.stroke();
var cell = diagram.cells[diagram.sites[iSite].id];
if (cell !== undefined)
{
var halfedges = cell.halfedges;
var nHalfedges = halfedges.length;
if (nHalfedges < 3) {return;}
var minx = canvas.width;
var miny = canvas.height;
var maxx = 0;
var maxy = 0;
var v = halfedges[0].getStartpoint();
ctx.beginPath();
ctx.moveTo(v.x,v.y);
for (var iHalfedge=0; iHalfedge<nHalfedges; iHalfedge++)
{
v = halfedges[iHalfedge].getEndpoint();
ctx.lineTo(v.x,v.y);
if (v.x< minx) minx = v.x;
if (v.y< miny) miny = v.y;
if (v.x> maxx) maxx = v.x;
if (v.y> maxy) maxy = v.y;
}
var C = Math.floor(Math.random()*128 + 127).toString();
var midx = (maxx+minx)/2;
var midy = (maxy+miny)/2;
var R = 0;
for (var iHalfedge=0; iHalfedge<nHalfedges; iHalfedge++)
{
v = halfedges[iHalfedge].getEndpoint();
var dx = v.x - site.x;
var dy = v.y - site.y;
var newR = Math.sqrt(dx*dx + dy*dy);
if (newR >R) R = newR;
}
midx = site.x;
midy = site.y;
var radgrad = ctx.createRadialGradient(midx+R*0.3,midy-R*0.3,0,midx,midy,R);
radgrad.addColorStop(0, "#09760b");
radgrad.addColorStop(1.0, "black");
ctx.fillStyle = radgrad;
ctx.fill();
var radgrad2 = ctx.createRadialGradient(midx-R*0.5,midy+R*0.5,R*0.1,midx,midy,R);
radgrad2.addColorStop(0, "rgba(255,255,255,0.5)");
radgrad2.addColorStop(0.04, "rgba(255,255,255,0.3)");
radgrad2.addColorStop(0.05, "rgba(255,255,255,0)");
ctx.fillStyle = radgrad2;
ctx.fill();
var lingrad = ctx.createLinearGradient(minx, site.y, minx+100, site.y-20);
lingrad.addColorStop(0.0, "rgba(255,255,255,0.5)");
lingrad.addColorStop(0.2, "rgba(255,255,255,0.2)");
lingrad.addColorStop(1.0, "rgba(255,255,255,0)");
ctx.fillStyle = lingrad;
ctx.fill();
}
}
if (nEdges)
{
var edge, v;
ctx.beginPath();
for (var iEdge=nEdges-1; iEdge>=0; iEdge-=1) {
edge = edges[iEdge];
v = edge.va;
ctx.moveTo(v.x,v.y);
v = edge.vb;
ctx.lineTo(v.x,v.y);
}
ctx.stroke();
}
canvas.toBuffer(function(err, buf){
var duration = new Date - start;
console.log('Rendered in %dms', duration);
res.writeHead(200, { 'Content-Type': 'image/png', 'Content-Length': buf.length });
res.end(buf);
});
}).listen(3000);
console.log('Server running on port 3000');
var start = new Date()
var bbox = { xl: 0, xr: canvas.width, yt: 0, yb: canvas.height }
for (var i = 0; i < 340; i++) {
x = Math.random() * canvas.width
y = Math.random() * canvas.height
voronoi.addSites([{ x: x, y: y }])
}
var diagram = voronoi.compute(bbox)
ctx.beginPath()
ctx.rect(0, 0, canvas.width, canvas.height)
ctx.fillStyle = '#fff'
ctx.fill()
ctx.strokeStyle = 'black'
ctx.stroke()
// voronoi
ctx.strokeStyle = 'rgba(255,255,255,0.5)'
ctx.lineWidth = 4
// edges
var edges = diagram.edges
var nEdges = edges.length
var sites = diagram.sites
var nSites = sites.length
for (var iSite = nSites - 1; iSite >= 0; iSite -= 1) {
var site = sites[iSite]
ctx.rect(site.x - 0.5, site.y - 0.5, 1, 1)
var cell = diagram.cells[diagram.sites[iSite].id]
if (cell !== undefined) {
var halfedges = cell.halfedges
var nHalfedges = halfedges.length
if (nHalfedges < 3) return
var minx = canvas.width
var miny = canvas.height
var maxx = 0
var maxy = 0
v = halfedges[0].getStartpoint()
ctx.beginPath()
ctx.moveTo(v.x, v.y)
for (iHalfedge = 0; iHalfedge < nHalfedges; iHalfedge++) {
v = halfedges[iHalfedge].getEndpoint()
ctx.lineTo(v.x, v.y)
if (v.x < minx) minx = v.x
if (v.y < miny) miny = v.y
if (v.x > maxx) maxx = v.x
if (v.y > maxy) maxy = v.y
}
var midx = (maxx + minx) / 2
var midy = (maxy + miny) / 2
var R = 0
for (iHalfedge = 0; iHalfedge < nHalfedges; iHalfedge++) {
v = halfedges[iHalfedge].getEndpoint()
var dx = v.x - site.x
var dy = v.y - site.y
var newR = Math.sqrt(dx * dx + dy * dy)
if (newR > R) R = newR
}
midx = site.x
midy = site.y
var radgrad = ctx.createRadialGradient(midx + R * 0.3, midy - R * 0.3, 0, midx, midy, R)
radgrad.addColorStop(0, '#09760b')
radgrad.addColorStop(1.0, 'black')
ctx.fillStyle = radgrad
ctx.fill()
var radgrad2 = ctx.createRadialGradient(midx - R * 0.5, midy + R * 0.5, R * 0.1, midx, midy, R)
radgrad2.addColorStop(0, 'rgba(255,255,255,0.5)')
radgrad2.addColorStop(0.04, 'rgba(255,255,255,0.3)')
radgrad2.addColorStop(0.05, 'rgba(255,255,255,0)')
ctx.fillStyle = radgrad2
ctx.fill()
var lingrad = ctx.createLinearGradient(minx, site.y, minx + 100, site.y - 20)
lingrad.addColorStop(0.0, 'rgba(255,255,255,0.5)')
lingrad.addColorStop(0.2, 'rgba(255,255,255,0.2)')
lingrad.addColorStop(1.0, 'rgba(255,255,255,0)')
ctx.fillStyle = lingrad
ctx.fill()
}
}
if (nEdges) {
var edge
ctx.beginPath()
for (var iEdge = nEdges - 1; iEdge >= 0; iEdge -= 1) {
edge = edges[iEdge]
v = edge.va
ctx.moveTo(v.x, v.y)
v = edge.vb
ctx.lineTo(v.x, v.y)
}
ctx.stroke()
}
canvas.toBuffer(function (err, buf) {
if (err) throw err
var duration = new Date() - start
console.log('Rendered in %dms', duration)
res.writeHead(200, {
'Content-Type': 'image/png',
'Content-Length': buf.length
})
res.end(buf)
})
}).listen(3000, function () {
console.log('Server running on port 3000')
})

5
package.json
View File

@ -24,7 +24,7 @@
"prebenchmark": "node-gyp build",
"benchmark": "node benchmarks/run.js",
"pretest": "node-gyp build",
"test": "mocha test/*.test.js",
"test": "standard examples/*.js && mocha test/*.test.js",
"pretest-server": "node-gyp build",
"test-server": "node test/server.js"
},
@ -35,7 +35,8 @@
"body-parser": "^1.13.3",
"express": "^4.13.2",
"jade": "^1.11.0",
"mocha": "*"
"mocha": "*",
"standard": "^7.1.1"
},
"engines": {
"node": ">=0.8.0"

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