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HTML5 Canvas - Pattern and Shadow
Create Pattern
There is following method required to create a pattern on the canvas −
Sr.No. | Method and Description |
---|---|
1 | createPattern(image, repetition) This method will use image to create the pattern. The second argument could be a string with one of the following values: repeat, repeat-x, repeaty, andno-repeat. If the empty string or null is specified, repeat will. be assumed |
Example
Following is a simple example which makes use of above mentioned method to create a nice pattern.
<!DOCTYPE HTML> <html> <head> <style> #test { width:100px; height:100px; margin: 0px auto; } </style> <script type = "text/javascript"> function drawShape() { // get the canvas element using the DOM var canvas = document.getElementById('mycanvas'); // Make sure we don't execute when canvas isn't supported if (canvas.getContext) { // use getContext to use the canvas for drawing var ctx = canvas.getContext('2d'); // create new image object to use as pattern var img = new Image(); img.src = 'images/pattern.jpg'; img.onload = function() { // create pattern var ptrn = ctx.createPattern(img,'repeat'); ctx.fillStyle = ptrn; ctx.fillRect(0,0,150,150); } } else { alert('You need Safari or Firefox 1.5+ to see this demo.'); } } </script> </head> <body id = "test" onload = "drawShape();"> <canvas id = "mycanvas"></canvas> </body> </html>
Assuming we have following pattern images/pattern.jpg.
The above example would draw following result −
Create Shadows
HTML5 canvas provides capabilities to create nice shadows around the drawings. All drawing operations are affected by the four global shadow attributes.
Sr.No. | Property and Description |
---|---|
1 | shadowColor [ = value ] This property returns the current shadow color and can be set, to change the shadow color. |
2 | shadowOffsetX [ = value ] This property returns the current shadow offset X and can be set, to change the shadow offset X. |
3 | shadowOffsetY [ = value ] This property returns the current shadow offset Y and can be set, change the shadow offset Y. |
4 | shadowBlur [ = value ] This property returns the current level of blur applied to shadows and can be set, to change the blur level. |
Example
Following is a simple example which makes use of above mentioned attributes to draw a shadow.
<!DOCTYPE HTML> <html> <head> <style> #test { width: 100px; height:100px; margin: 0px auto; } </style> <script type = "text/javascript"> function drawShape() { // get the canvas element using the DOM var canvas = document.getElementById('mycanvas'); // Make sure we don't execute when canvas isn't supported if (canvas.getContext) { // use getContext to use the canvas for drawing var ctx = canvas.getContext('2d'); ctx.shadowOffsetX = 2; ctx.shadowOffsetY = 2; ctx.shadowBlur = 2; ctx.shadowColor = "rgba(0, 0, 0, 0.5)"; ctx.font = "20px Times New Roman"; ctx.fillStyle = "Black"; ctx.fillText("This is shadow test", 5, 30); } else { alert('You need Safari or Firefox 1.5+ to see this demo.'); } } </script> </head> <body id = "test" onload = "drawShape();"> <canvas id = "mycanvas"></canvas> </body> </html>
The above example would produce following result −