Learn html - html tutorial - Transform method in html5 canvas - html examples - html programs
- The transform() is the method of HTML CANVAS.
- The transform() method is used to transform the current diagram by using the transformation matrix like an identity matrix.
- The transform() method is used to scale, rotate, move, and skew the diagram.
Syntax for transform() Method in HTML5 Canvas:
context.transform(a,b,c,d,e,f);
Parameter values for transform() Method in HTML5 Canvas:
| Parameter |
Description |
| a |
Horizontal scaling |
| b |
Horizontal skewing |
| c |
Vertical skewing |
| d |
Vertical scaling |
| e |
Horizontal moving |
| f |
Vertical moving |
Sample Coding for transform() Method in HTML5 Canvas:
Tryit<!DOCTYPE html>
<html>
<head>
<title>wikitechy-transform() in canvas</title>
</head>
<body>
<h1>wikitechy-transform() in canvas</h1>
<canvas id="wikitechyCanvas" width="300" height="150"
style="border:1px solid #d3d3d3;">
</canvas>
<script>
var canvas = document.getElementById("wikitechyCanvas");
var context = canvas.getContext("2d");
context.fillStyle = "purple";
context.fillRect(0, 0, 250, 200);
context.transform(1, 0.5, -0.5, 1, 30, 10);
context.fillStyle = "pink";
context.fillRect(0, 0, 250, 200);
context.transform(1, 0.5, -0.5, 1, 30, 10);
context.fillStyle = "green";
context.fillRect(0, 0, 250, 100);
</script>
</body>
</html>
Code Explanation for transform() Method in HTML5 Canvas:
- ”wikitechyCanvas” is used to declare the id value of the canvas tag.
- The getElementById() method is used to get the element with the specific id (“wikitechyCanvas”).
- canvas.getContext(“2d”) method returns an object that provides methods and properties for drawing on the canvas.
- The context.fillStyle() method is used to fillStyle of a diagram (purple color rectangular box).
- The context.fillRect() method is used to draws a "filled" rectangle (0,0,250,200) in (x0,y0,x1,y1).
- The context.transform() method is used to “transform” a diagram (1, 0.5, -0.5, 1, 30, 10) in (a,b,c,d,e,f).
- The context.fillstyle() method is used to fillstyle of a diagram (pink color rectangular box).
- The context.fillRect() method is used to draws a "filled" rectangle (0,0,250,200) (x0,y0,x1,y1).
- The context.transform() method is used to “transform” a diagram (1, 0.5, -0.5, 1, 30, 10) (a,b,c,d,e,f).
- The context.fillstyle() method is used to fillstyle of a diagram (green color rectangular box).
- The context.fillRect() method is used to draws a "filled" rectangle (0, 0, 250, 100) in (x0,y0,x1,y1).
Output for transform() Method in HTML5 Canvas:
- <canvas> tag is used to draw a rectangle with gray border.
- The rectangle is drawn with this parameter (0,0,250,200) and filled with purple color
- The rectangle is drawn with this parameter (0,0,250,250)and filled with pink color
-context.transform(1, 0.5, -0.5, 1, 30, 10);
- The rectangle is drawn with this parameter (0,0,250,100)and filled with green color
-context.transform(1, 0.5, -0.5, 1, 30, 10);
Browser Support for transform() Method in HTML5 Canvas:
Tips and Notes
- The setTransform() method does not behave relatively to other transformations.
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