var tests = {};

tests['clearRect()'] = function(ctx){
  ctx.fillRect(25,25,100,100);
  ctx.clearRect(45,45,60,60);
  ctx.fillRect(50,50,50,50);
};

tests['strokeRect()'] = function(ctx){
  ctx.fillRect(25,25,100,100);
  ctx.clearRect(45,45,60,60);
  ctx.strokeRect(50,50,50,50);
};

tests['lineTo()'] = function(ctx){
  // Filled triangle
  ctx.beginPath();
  ctx.moveTo(25.5,25);
  ctx.lineTo(105,25);
  ctx.lineTo(25,105);
  ctx.fill();

  // Stroked triangle
  ctx.beginPath();
  ctx.moveTo(125,125);
  ctx.lineTo(125,45);
  ctx.lineTo(45,125);
  ctx.closePath();
  ctx.stroke();
};

tests['arc()'] = function(ctx){
  ctx.beginPath();
  ctx.arc(75,75,50,0,Math.PI*2,true); // Outer circle
  ctx.moveTo(110,75);
  ctx.arc(75,75,35,0,Math.PI,false);   // Mouth
  ctx.moveTo(65,65);
  ctx.arc(60,65,5,0,Math.PI*2,true);  // Left eye
  ctx.moveTo(95,65);
  ctx.arc(90,65,5,0,Math.PI*2,true);  // Right eye
  ctx.stroke();
};

tests['arc() 2'] = function(ctx){
  for(var i=0;i<4;i++){
    for(var j=0;j<3;j++){
      ctx.beginPath();
      var x              = 25+j*50;               // x coordinate
      var y              = 25+i*50;               // y coordinate
      var radius         = 20;                    // Arc radius
      var startAngle     = 0;                     // Starting point on circle
      var endAngle       = Math.PI+(Math.PI*j)/2; // End point on circle
      var anticlockwise  = i%2==0 ? false : true; // clockwise or anticlockwise

      ctx.arc(x,y,radius,startAngle,endAngle, anticlockwise);

      if (i>1){
        ctx.fill();
      } else {
        ctx.stroke();
      }
    }
  }
};

tests['bezierCurveTo()'] = function(ctx){
  ctx.beginPath();
  ctx.moveTo(75,40);
  ctx.bezierCurveTo(75,37,70,25,50,25);
  ctx.bezierCurveTo(20,25,20,62.5,20,62.5);
  ctx.bezierCurveTo(20,80,40,102,75,120);
  ctx.bezierCurveTo(110,102,130,80,130,62.5);
  ctx.bezierCurveTo(130,62.5,130,25,100,25);
  ctx.bezierCurveTo(85,25,75,37,75,40);
  ctx.fill();
};

tests['quadraticCurveTo()'] = function(ctx){
  ctx.beginPath();
  ctx.moveTo(75,25);
  ctx.quadraticCurveTo(25,25,25,62.5);
  ctx.quadraticCurveTo(25,100,50,100);
  ctx.quadraticCurveTo(50,120,30,125);
  ctx.quadraticCurveTo(60,120,65,100);
  ctx.quadraticCurveTo(125,100,125,62.5);
  ctx.quadraticCurveTo(125,25,75,25);
  ctx.stroke();
};

tests['rotate()'] = function(ctx){
  ctx.rotate(0.4);
  ctx.translate(30,0);
  ctx.rect(0,0,50,50);
  ctx.stroke();
};

tests['rotate() 2'] = function(ctx){
  ctx.translate(75,75);

  for (var i=1;i<6;i++){ // Loop through rings (from inside to out)
    ctx.save();
    ctx.fillStyle = 'rgb('+(51*i)+','+(255-51*i)+',255)';

    for (var j=0;j<i*6;j++){ // draw individual dots
      ctx.rotate(Math.PI*2/(i*6));
      ctx.beginPath();
      ctx.arc(0,i*12.5,5,0,Math.PI*2,true);
      ctx.fill();
    }

    ctx.restore();
  }
};

tests['translate()'] = function(ctx){
  ctx.fillRect(0,0,300,300);
  for (var i=0;i<3;i++) {
    for (var j=0;j<3;j++) {
      ctx.save();
      ctx.strokeStyle = "#9CFF00";
      ctx.translate(50+j*100,50+i*100);
      drawSpirograph(ctx,20*(j+2)/(j+1),-8*(i+3)/(i+1),10);
      ctx.restore();
    }
  }
  function drawSpirograph(ctx,R,r,O){
    var x1 = R-O;
    var y1 = 0;
    var i  = 1;
    ctx.beginPath();
    ctx.moveTo(x1,y1);
    do {
      if (i>20000) break;
      var x2 = (R+r)*Math.cos(i*Math.PI/72) - (r+O)*Math.cos(((R+r)/r)*(i*Math.PI/72))
      var y2 = (R+r)*Math.sin(i*Math.PI/72) - (r+O)*Math.sin(((R+r)/r)*(i*Math.PI/72))
      ctx.lineTo(x2,y2);
      x1 = x2;
      y1 = y2;
      i++;
    } while (x2 != R-O && y2 != 0 );
    ctx.stroke();
  }
};

tests['scale()'] = function(ctx){
  ctx.strokeStyle = "#fc0";
  ctx.lineWidth = 1.5;
  ctx.fillRect(0,0,300,300);

  // Uniform scaling
  ctx.save()
  ctx.translate(50,50);
  drawSpirograph(ctx,22,6,5);  // no scaling

  ctx.translate(100,0);
  ctx.scale(0.75,0.75);
  drawSpirograph(ctx,22,6,5);

  ctx.translate(133.333,0);
  ctx.scale(0.75,0.75);
  drawSpirograph(ctx,22,6,5);
  ctx.restore();

  // Non-uniform scaling (y direction)
  ctx.strokeStyle = "#0cf";
  ctx.save()
  ctx.translate(50,150);
  ctx.scale(1,0.75);
  drawSpirograph(ctx,22,6,5);

  ctx.translate(100,0);
  ctx.scale(1,0.75);
  drawSpirograph(ctx,22,6,5);

  ctx.translate(100,0);
  ctx.scale(1,0.75);
  drawSpirograph(ctx,22,6,5);
  ctx.restore();

  // Non-uniform scaling (x direction)
  ctx.strokeStyle = "#cf0";
  ctx.save()
  ctx.translate(50,250);
  ctx.scale(0.75,1);
  drawSpirograph(ctx,22,6,5);

  ctx.translate(133.333,0);
  ctx.scale(0.75,1);
  drawSpirograph(ctx,22,6,5);

  ctx.translate(177.777,0);
  ctx.scale(0.75,1);
  drawSpirograph(ctx,22,6,5);
  ctx.restore();
  function drawSpirograph(ctx,R,r,O){
    var x1 = R-O;
    var y1 = 0;
    var i  = 1;
    ctx.beginPath();
    ctx.moveTo(x1,y1);
    do {
      if (i>20000) break;
      var x2 = (R+r)*Math.cos(i*Math.PI/72) - (r+O)*Math.cos(((R+r)/r)*(i*Math.PI/72))
      var y2 = (R+r)*Math.sin(i*Math.PI/72) - (r+O)*Math.sin(((R+r)/r)*(i*Math.PI/72))
      ctx.lineTo(x2,y2);
      x1 = x2;
      y1 = y2;
      i++;
    } while (x2 != R-O && y2 != 0 );
    ctx.stroke();
  }
};

tests['rect()'] = function(ctx){
  ctx.rect(5,5,50,50);
  ctx.strokeStyle = 'yellow';
  ctx.fill();
  ctx.stroke();
};

tests['clip()'] = function(ctx){
  ctx.arc(50,50,50,0,Math.PI * 2);
  ctx.stroke();
  ctx.clip();
  ctx.fillStyle = 'rgba(0,0,0,.5)';
  ctx.fillRect(0,0,100,100);
};

tests['createLinearGradient()'] = function(ctx){
  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)');

  ctx.fillStyle = lingrad;
  ctx.strokeStyle = lingrad2;

  ctx.fillRect(10,10,130,130);
  ctx.strokeRect(50,50,50,50);  
};

tests['createRadialGradient()'] = function(ctx){
  // Create gradients
  var radgrad = ctx.createRadialGradient(45,45,10,52,50,30);
  radgrad.addColorStop(0, '#A7D30C');
  radgrad.addColorStop(0.9, '#019F62');
  radgrad.addColorStop(1, 'rgba(1,159,98,0)');

  var radgrad2 = ctx.createRadialGradient(105,105,20,112,120,50);
  radgrad2.addColorStop(0, '#FF5F98');
  radgrad2.addColorStop(0.75, '#FF0188');
  radgrad2.addColorStop(1, 'rgba(255,1,136,0)');

  var radgrad3 = ctx.createRadialGradient(95,15,15,102,20,40);
  radgrad3.addColorStop(0, '#00C9FF');
  radgrad3.addColorStop(0.8, '#00B5E2');
  radgrad3.addColorStop(1, 'rgba(0,201,255,0)');

  var radgrad4 = ctx.createRadialGradient(0,150,50,0,140,90);
  radgrad4.addColorStop(0, '#F4F201');
  radgrad4.addColorStop(0.8, '#E4C700');
  radgrad4.addColorStop(1, 'rgba(228,199,0,0)');

  // draw shapes
  ctx.fillStyle = radgrad4;
  ctx.fillRect(0,0,150,150);
  ctx.fillStyle = radgrad3;
  ctx.fillRect(0,0,150,150);
  ctx.fillStyle = radgrad2;
  ctx.fillRect(0,0,150,150);
  ctx.fillStyle = radgrad;
  ctx.fillRect(0,0,150,150);
};

tests['globalAlpha'] = function(ctx){
  ctx.globalAlpha = 0.5;
  ctx.fillStyle = 'rgba(0,0,0,0.5)';
  ctx.strokeRect(0,0,50,50);

  ctx.globalAlpha = 0.8;
  ctx.fillRect(20,20,20,20);

  ctx.fillStyle = 'black';
  ctx.globalAlpha = 1;
  ctx.fillRect(25,25,10,10);
};

tests['globalAlpha 2'] = function(ctx){
  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';

  ctx.globalAlpha = 0.2;

  for (var i=0;i<7;i++){
      ctx.beginPath();
      ctx.arc(75,75,10+10*i,0,Math.PI*2,true);
      ctx.fill();
  }
};

tests['fillStyle'] = function(ctx){
  for (i=0;i<6;i++){
    for (j=0;j<6;j++){
      ctx.fillStyle = 'rgb(' + Math.floor(255-42.5*i) + ',' + 
                       Math.floor(255-42.5*j) + ',0)';
      ctx.fillRect(j*25,i*25,25,25);
    }
  }
};

tests['strokeStyle'] = function(ctx){
  for (var i=0;i<6;i++){
    for (var j=0;j<6;j++){
      ctx.strokeStyle = 'rgb(0,' + Math.floor(255-42.5*i) + ',' + 
                       Math.floor(255-42.5*j) + ')';
      ctx.beginPath();
      ctx.arc(12.5+j*25,12.5+i*25,10,0,Math.PI*2,true);
      ctx.stroke();
    }
  }
};

tests['fill with stroke'] = function(ctx){
  ctx.beginPath();
  ctx.arc(75,75,50,0,Math.PI*2,true);
  ctx.fill();
  ctx.closePath();
  ctx.beginPath();
  ctx.fillStyle = 'red';
  ctx.strokeStyle = 'yellow';
  ctx.arc(75,75,30,0,Math.PI*2,true);
  ctx.fill();
  ctx.stroke();
};

tests['lineWidth'] = function(ctx){
  for (var i = 0; i < 10; i++){
    ctx.lineWidth = 1+i;
    ctx.beginPath();
    ctx.moveTo(5+i*14,5);
    ctx.lineTo(5+i*14,140);
    ctx.stroke();
  }
};

tests['line caps'] = function(ctx){
  var lineCap = ['butt','round','square'];

  ctx.strokeStyle = '#09f';
  ctx.beginPath();
  ctx.moveTo(10,10);
  ctx.lineTo(140,10);
  ctx.moveTo(10,140);
  ctx.lineTo(140,140);
  ctx.stroke();

  ctx.strokeStyle = 'black';
  for (var i=0;i<lineCap.length;i++){
    ctx.lineWidth = 15;
    ctx.lineCap = lineCap[i];
    ctx.beginPath();
    ctx.moveTo(25+i*50,10);
    ctx.lineTo(25+i*50,140);
    ctx.stroke();
  }
};

tests['line join'] = function(ctx){
  var lineJoin = ['round','bevel','miter'];
  ctx.lineWidth = 10;
  for (var i=0;i<lineJoin.length;i++){
    ctx.lineJoin = lineJoin[i];
    ctx.beginPath();
    ctx.moveTo(-5,5+i*40);
    ctx.lineTo(35,45+i*40);
    ctx.lineTo(75,5+i*40);
    ctx.lineTo(115,45+i*40);
    ctx.lineTo(155,5+i*40);
    ctx.stroke();
  }
};

tests['lineCap default'] = function(ctx){
  ctx.beginPath();
  ctx.lineWidth = 10.0;
  ctx.moveTo(50, 50);
  ctx.lineTo(50, 100);
  ctx.lineTo(80, 120);
  ctx.stroke();
};

tests['lineCap'] = function(ctx){
  ctx.beginPath();
  ctx.lineWidth = 10.0;
  ctx.lineCap = 'round';
  ctx.moveTo(50, 50);
  ctx.lineTo(50, 100);
  ctx.lineTo(80, 120);
  ctx.stroke();
};

tests['lineJoin'] = function(ctx){
  ctx.beginPath();
  ctx.lineWidth = 10.0;
  ctx.lineJoin = 'round';
  ctx.moveTo(50, 50);
  ctx.lineTo(50, 100);
  ctx.lineTo(80, 120);
  ctx.stroke();
};

tests['states'] = function(ctx){
  ctx.save();
  ctx.rect(50, 50, 100, 100);
  ctx.stroke();

  ctx.restore();
  ctx.save();
  ctx.translate(50,50);
  ctx.scale(.5,.5);
  ctx.strokeRect(51, 51, 100, 100);

  ctx.restore();
  ctx.translate(95,95);
  ctx.fillRect(0,0,10,10);
};

tests['states with stroke/fill/globalAlpha'] = function(ctx){
  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); 
};

tests['invalid stroke/fill styles'] = function(ctx){
  ctx.fillStyle = 'red';
  ctx.strokeStyle = 'yellow';
  ctx.rect(50,50,50,50);
  ctx.fill();
  ctx.stroke();
  ctx.beginPath();
  ctx.fillStyle = 'asdf';
  ctx.strokeStyle = 'asdf';
  ctx.rect(100,80,15,15);
  ctx.fill();
  ctx.stroke();
};

tests['fillText()'] = function(ctx){
  ctx.font = '30px Arial';
  ctx.rotate(.1);
  ctx.lineTo(10,10);
  ctx.fillText("Awesome!", 50, 100);

  var te = ctx.measureText('Awesome!');

  ctx.strokeStyle = 'rgba(0,0,0,0.5)';
  ctx.lineTo(50, 102);
  ctx.lineTo(50 + te.width, 102);
  ctx.stroke();
};

tests['fillText() transformations'] = function(ctx){
  ctx.strokeStyle = '#666';
  ctx.font = 'bold 12px Helvetica';

  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.rotate(0.2);
  ctx.fillText("foo", 150, 100);
  ctx.font = 'normal 30px Arial';
  ctx.fillText("bar", 50, 100);
};

tests['strokeText()'] = function(ctx){
  ctx.strokeStyle = '#666';
  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.strokeStyle = 'red';
  ctx.font = 'normal 50px Arial';
  ctx.strokeText("bar", 100, 100);
};

tests['textAlign right'] = function(ctx){
  ctx.strokeStyle = '#666';
  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.font = 'normal 20px Arial';
  ctx.textAlign = 'right';
  ctx.fillText("right", 100, 100);
};

tests['textAlign left'] = function(ctx){
  ctx.strokeStyle = '#666';
  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.font = 'normal 20px Arial';
  ctx.textAlign = 'left';
  ctx.fillText("left", 100, 100);
};

tests['textAlign center'] = function(ctx){
  ctx.strokeStyle = '#666';
  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.font = 'normal 20px Arial';
  ctx.textAlign = 'center';
  ctx.fillText("center", 100, 100);
};

tests['textBaseline alphabetic'] = function(ctx){
  ctx.strokeStyle = '#666';
  ctx.strokeRect(0,0,200,200);
  ctx.lineTo(0,100);
  ctx.lineTo(200,100);
  ctx.stroke();

  ctx.font = 'normal 20px Arial';
  ctx.textBaseline = 'alphabetic';
  ctx.textAlign = 'center';
  ctx.fillText("alphabetic", 100, 100);
};

tests['textBaseline top'] = function(ctx){
  ctx.strokeStyle = '#666';
  ctx.strokeRect(0,0,200,200);
  ctx.lineTo(0,100);
  ctx.lineTo(200,100);
  ctx.stroke();

  ctx.font = 'normal 20px Arial';
  ctx.textBaseline = 'top';
  ctx.textAlign = 'center';
  ctx.fillText("top", 100, 100);
};

tests['textBaseline hanging'] = function(ctx){
  ctx.strokeStyle = '#666';
  ctx.strokeRect(0,0,200,200);
  ctx.lineTo(0,100);
  ctx.lineTo(200,100);
  ctx.stroke();

  ctx.font = 'normal 20px Arial';
  ctx.textBaseline = 'hanging';
  ctx.textAlign = 'center';
  ctx.fillText("hanging", 100, 100);
};

tests['textBaseline bottom'] = function(ctx){
  ctx.strokeStyle = '#666';
  ctx.strokeRect(0,0,200,200);
  ctx.lineTo(0,100);
  ctx.lineTo(200,100);
  ctx.stroke();

  ctx.font = 'normal 20px Arial';
  ctx.textBaseline = 'bottom';
  ctx.textAlign = 'center';
  ctx.fillText("bottom", 100, 100);
};

tests['textBaseline ideographic'] = function(ctx){
  ctx.strokeStyle = '#666';
  ctx.strokeRect(0,0,200,200);
  ctx.lineTo(0,100);
  ctx.lineTo(200,100);
  ctx.stroke();

  ctx.font = 'normal 20px Arial';
  ctx.textBaseline = 'ideographic';
  ctx.textAlign = 'center';
  ctx.fillText("ideographic", 100, 100);
};

tests['globalCompositeOperation source-over'] = function(ctx){
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,100,100);
  ctx.globalCompositeOperation = 'source-over';
  ctx.fillStyle = 'red';
  ctx.arc(80,80,50,0,Math.PI * 2);
  ctx.fill();
};

tests['globalCompositeOperation source-in'] = function(ctx){
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,100,100);
  ctx.globalCompositeOperation = 'source-in';
  ctx.fillStyle = 'red';
  ctx.arc(80,80,50,0,Math.PI * 2);
  ctx.fill();
};

tests['globalCompositeOperation source-out'] = function(ctx){
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,100,100);
  ctx.globalCompositeOperation = 'source-out';
  ctx.fillStyle = 'red';
  ctx.arc(80,80,50,0,Math.PI * 2);
  ctx.fill();
};

tests['globalCompositeOperation destination-in'] = function(ctx){
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,100,100);
  ctx.globalCompositeOperation = 'destination-in';
  ctx.fillStyle = 'red';
  ctx.arc(80,80,50,0,Math.PI * 2);
  ctx.fill();
};

tests['globalCompositeOperation destination-out'] = function(ctx){
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,100,100);
  ctx.globalCompositeOperation = 'destination-out';
  ctx.fillStyle = 'red';
  ctx.arc(80,80,50,0,Math.PI * 2);
  ctx.fill();
};

tests['globalCompositeOperation destination-atop'] = function(ctx){
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,100,100);
  ctx.globalCompositeOperation = 'destination-atop';
  ctx.fillStyle = 'red';
  ctx.arc(80,80,50,0,Math.PI * 2);
  ctx.fill();
};

tests['globalCompositeOperation xor'] = function(ctx){
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,100,100);
  ctx.globalCompositeOperation = 'xor';
  ctx.fillStyle = 'red';
  ctx.arc(80,80,50,0,Math.PI * 2);
  ctx.fill();
};

tests['globalCompositeOperation copy'] = function(ctx){
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,100,100);
  ctx.globalCompositeOperation = 'copy';
  ctx.fillStyle = 'red';
  ctx.arc(80,80,50,0,Math.PI * 2);
  ctx.fill();
};

tests['globalCompositeOperation lighter'] = function(ctx){
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,100,100);
  ctx.globalCompositeOperation = 'lighter';
  ctx.fillStyle = 'red';
  ctx.arc(80,80,50,0,Math.PI * 2);
  ctx.fill();
};