javascript canvas九宫格小程序

 

js核心代码

 1 /*

 2  *canvasid:html canvas标签id

 3  *imageid:html img 标签id

 4  *gridcountX:x轴图片分割个数

 5  *gridcountY:y轴图片分割个数

 6  *gridspace:宫格空隙

 7  *offsetX：x*y宫格相对canvas（0，0）X坐标偏移量

 8  **offsetX：x*y宫格相对canvas（0，0）Y坐标偏移量

 9  *isanimat：是否启用动画显示

10  */

11 function ImageGrid(canvasid, imageid, gridcountX, gridcountY, gridspace, offsetX, offsetY, isanimat) {

12     var image = new Image();

13     var g = document.getElementById(canvasid).getContext("2d");

14     var img=document.getElementById(imageid);

15     image.src=img.getAttribute("src");

16     g.drawImage(image, 0, 0);

17     var imagedata = g.getImageData(0, 0, image.width, image.height);

18     var grid_width = imagedata.width / gridcountX;

19     var grid_height = imagedata.height / gridcountY;

20     //动画

21     if (isanimat) {

22         var x = 0,

23             y = 0;

24         var inter = setInterval(function() {

25             g.putImageData(imagedata, gridspace * x + offsetX, gridspace * y + offsetY, grid_width * x, grid_height * y, grid_width, grid_height);

26             x < gridcountX ? x++ : x = 0;

27             if (x == 0) {

28                 y < gridcountY ? y++ : y = 0;

29             }

30         }, 200);

31         y == gridcountY ? clearInterval(inter) : null;

32     } else { //非动画

33         for (var y = 0; y < gridcountY; y++) {

34             for (var x = 0; x < gridcountX; x++) {

35                 g.putImageData(imagedata, gridspace * x + offsetX, gridspace * y + offsetY, grid_width * x, grid_height * y, grid_width, grid_height);

36             }

37         }

38     }

39 }

View Code

 http://files.cnblogs.com/veiny/image_grid.xml

下载该xml文件后缀名改为html，打开浏览器观看。