Difference between revisions of "WebFund 2014W Lecture 17"
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[http://homeostasis.scs.carleton.ca/~soma/webfund-2014w/adventure-editor-class.zip adventure-editor-class] is also available (without modules, you'll have to run "npm install" or copy node_modules from adventure-editor or similar application). | [http://homeostasis.scs.carleton.ca/~soma/webfund-2014w/adventure-editor-class.zip adventure-editor-class] is also available (without modules, you'll have to run "npm install" or copy node_modules from adventure-editor or similar application). | ||
HTML Canvas Element | |||
* Part of HTML5 | |||
* scriptable rendering of 2D shapes and bitmap images | |||
<canvas id="example" width="200" height="200"> | |||
</canvas> | |||
* We can use Javascript to draw on the canvas. | |||
<script> | |||
// The following code draws a red box on the screen. | |||
var example = document.getElementById('example'); | |||
var context = example.getContext('2d'); | |||
context.fillStyle = 'red'; | |||
context.fillRect(30, 30, 50, 50) | |||
//The following code draws a circle. | |||
context.beginPath(); | |||
context.arc(100, 75, 50, 0, 2 *Math.PI); | |||
context.stroke(); | |||
</script> | |||
* Drawing a arc is similar in languages such as Processing. | |||
* Arcs are defined by a center point, a radius, a starting angle, an ending angle, and the drawing direction (either clockwise or anticlockwise). | |||
Revision as of 21:20, 3 April 2014
The video from the lecture given on March 14, 2014 is available:
adventure-editor-class is also available (without modules, you'll have to run "npm install" or copy node_modules from adventure-editor or similar application).
HTML Canvas Element
- Part of HTML5
- scriptable rendering of 2D shapes and bitmap images
<canvas id="example" width="200" height="200"> </canvas>
- We can use Javascript to draw on the canvas.
<script> // The following code draws a red box on the screen. var example = document.getElementById('example'); var context = example.getContext('2d'); context.fillStyle = 'red'; context.fillRect(30, 30, 50, 50)
//The following code draws a circle. context.beginPath(); context.arc(100, 75, 50, 0, 2 *Math.PI); context.stroke(); </script>
- Drawing a arc is similar in languages such as Processing.
- Arcs are defined by a center point, a radius, a starting angle, an ending angle, and the drawing direction (either clockwise or anticlockwise).