Tileset for HTML5 canvas game

Question

I'm trying to make a game in HTML5 canvas, but instead of uploading a ton of images I want to just upload one image that has all of the tiles on it. The problem is, I don't know how to make only one part of the image show up. Basically I want to do what Google does with this image: http://www.google.com/images/srpr/nav_logo27.png except with fixed height/width tiles. Can someone explain to me how to do this? Also, if it's different in canvas than in a regular html page without canvas, how would I do it in canvas?

Pantheas

Answer 1

You can use the slicing parameters of drawImage

drawImage(image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight)

• sx, sy: left and top offset of the part to be sliced
• sWidth, sHeight: dimensions of the part to be sliced
• dx, dy: left and top offset for the image on the canvas to be rendered at
• dWidth, dHeight: image dimensions on the canvas

More info at: Using images - Slicing (MDC)

Acquah

Answer 2

Take a look at SpriteJS https://github.com/batiste/sprite.js/blob/master/sprite.js there the work is based on offset at the moment of drawing the sprite from a single picture.

Dalury

Answer 3

This is how I do it with GWT: http://code.google.com/p/gwt-examples/wiki/gwt_hmtl5

Markitamarkka