Zadatak1

<html>
<head>
</head>
<body>
<canvas id="myCanvas" width="200" height="100">
</canvas>

<script>

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="#FF0000";
ctx.fillRect(0,0,200,100);

</script>

<canvas id="myCanvas1" width="200" height="100" >
</canvas>

<script>
var c=document.getElementById("myCanvas1");
var ctx=c.getContext("2d");

var grd=ctx.createLinearGradient(0,0,200,200);
grd.addColorStop(0,"black");
grd.addColorStop(1,"white");

ctx.fillStyle=grd;
ctx.fillRect(0,0,200,100);
</script>
<canvas id="MyCanvas3" width="200" height="100"></canvas>
<script type="text/javascript">
var canvasId = 'MyCanvas3',
canvas = document.getElementById(canvasId),
ctx = canvas.getContext('2d'),
grd;
grd = ctx.createLinearGradient(0.000, 150.000, 300.000, 150.000);
grd.addColorStop(0.000, 'rgba(255, 0, 0, 1.000)');
grd.addColorStop(0.150, 'rgba(255, 0, 255, 1.000)');
grd.addColorStop(0.330, 'rgba(0, 0, 255, 1.000)');
grd.addColorStop(0.490, 'rgba(0, 255, 255, 1.000)');
grd.addColorStop(0.670, 'rgba(0, 255, 0, 1.000)');
grd.addColorStop(0.840, 'rgba(255, 255, 0, 1.000)');
grd.addColorStop(1.000, 'rgba(255, 0, 0, 1.000)');
ctx.fillStyle = grd;
ctx.fillRect(0,0,200,100);
</script>

<canvas id="myCanvas2" width="200" height="100">
</canvas>
<script>
var c=document.getElementById("myCanvas2");
var ctx=c.getContext("2d");
ctx.font="40px Arial";
ctx.strokeText("Smile!",20,60)
var grd=ctx.createLinearGradient(0,0,200,10);
grd.addColorStop(0,"red");
grd.addColorStop(0.3,"yellow");
grd.addColorStop(0.6,"green");
grd.addColorStop(1,"blue");
ctx.strokeStyle=grd;
ctx.strokeText("Smile!",20,60);
</script>

</body>
</html>