To create shadow in HTML canvas use the shadowColor property together with the shadowBlur property.
The HTML canvas shadowColor property sets or returns the color to use for shadows.
Syntax:
context.shadowColor=color;The HTML canvas shadowBlur property sets or returns the blur level for shadows.
Syntax:
context.shadowBlur=number;Example:
<!DOCTYPE html>
<html>
<body>
<canvas id="shadow-blur" width="300" height="180" style="border:1px solid #333;">
</canvas>
<script>
var c = document.getElementById("shadow-blur");
var ctx = c.getContext("2d");
ctx.shadowBlur = 30;
ctx.fillStyle = "#2a9d8f";
ctx.shadowColor = "black";
ctx.fillRect(30, 40, 100, 100);
ctx.shadowColor = "#264653";
ctx.fillRect(170, 40, 100, 100);
</script>
</body>
</html>Output:
To adjust the shadow use the shadowOffsetX and shadowOffsetY properties.
The HTML canvas shadowOffsetX property sets or returns the horizontal distance of the shadow from the shape.
Syntax:
context.shadowOffsetX=number;Example:
<!DOCTYPE html>
<html>
<body>
<canvas id="offset-x" width="200" height="200" style="border:1px solid #333;">
</canvas>
<script>
var c = document.getElementById("offset-x");
var ctx = c.getContext("2d");
ctx.shadowBlur = 15;
ctx.shadowOffsetX = 25;
ctx.shadowColor = "black";
ctx.fillStyle= "#2a9d8f";
ctx.fillRect(50, 50, 100, 100);
</script>
</body>
</html>Output:
The HTML canvas shadowOffsetY property sets or returns the vertical distance of the shadow from the shape.
Example:
<!DOCTYPE html>
<html>
<body>
<canvas id="offset-y" width="200" height="200" style="border:1px solid #333;">
</canvas>
<script>
var c = document.getElementById("offset-y");
var ctx = c.getContext("2d");
ctx.shadowBlur = 15;
ctx.shadowOffsetY = 25;
ctx.shadowColor = "black";
ctx.fillStyle= "#2a9d8f";
ctx.fillRect(50, 50, 100, 100);
</script>
</body>
</html>Output:
Enjoy coding!