Save a draw state
Description
save() saves the values for the drawing state properties.
Example
The following code draws three shapes, one circle and two rectangles. When drawing the first rectangle it sets the fill style to solid blue. Before drawing the circle it saves the drawing state by calling save() method. After painting the circle it restores back the saved drawing state and paints the second rectangle. We can see that the first and second rectangle share the same drawing style.
<!DOCTYPE HTML>
<html>
<head>
<script>
window.onload = function(){<!--from w w w . j a va2s. com-->
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
// draw rectangle
context.beginPath();
context.rect(150, 30, 130, 130);
context.fillStyle = "blue";
context.fill();
// wrap circle drawing code with save-restore combination
context.save();
context.globalAlpha = 0.5; // set global alpha
context.beginPath();
context.arc(canvas.width / 2, canvas.height / 2, 70, 0, 2 * Math.PI, false);
context.fillStyle = "red";
context.fill();
context.restore();
// draw another rectangle
context.beginPath();
context.rect(canvas.width - (150 + 130), canvas.height - (30 + 130), 130, 130);
context.fill();
};
</script>
</head>
<body>
<canvas id="myCanvas" width="600" height="250" style="border:1px solid black;">
</canvas>
</body>
</html>