Using javascript canvas to create a nine-square grid applet_javascript skills

js core code

Copy code The code is as follows:

/*
*canvasid:html canvas tag id
*imageid:html img tag id
*gridcountX: Number of x-axis image divisions
*gridcountY: number of y-axis image divisions
*gridspace:Grid space
*offsetX: x*y grid relative to canvas (0, 0) X coordinate offset
**offsetX: x*y grid relative to canvas (0, 0) Y coordinate offset
*isanimat: Whether to enable animation display
*/
function ImageGrid(canvasid, imageid, gridcountX, gridcountY, gridspace, offsetX, offsetY, isanimat) {
var image = new Image();
var g = document.getElementById(canvasid).getContext("2d");
var img=document.getElementById(imageid);
Image.src=img.getAttribute("src");
g.drawImage(image, 0, 0);
var imagedata = g.getImageData(0, 0, image.width, image.height);
var grid_width = imagedata.width / gridcountX;
var grid_height = imagedata.height / gridcountY;
//Animation
If (isanimat) {
      var x = 0,
          y = 0;
      var inter = setInterval(function() {
g.putImageData(imagedata, gridspace * x offsetX, gridspace * y offsetY, grid_width * x, grid_height * y, grid_width, grid_height);
               x < gridcountX ? x : x = 0;
                  if (x == 0) {
              y < gridcountY ? y : y = 0;
            }
}, 200);
y == gridcountY ? clearInterval(inter) : null;
} else { //Non-animated
for (var y = 0; y < gridcountY; y ) {
for (var x = 0; x < gridcountX; x ) {
g.putImageData(imagedata, gridspace * x offsetX, gridspace * y offsetY, grid_width * x, grid_height * y, grid_width, grid_height);
            }
}
}
}

html code

Copy code The code is as follows:

Canvas demo

How to use:

Copy code The code is as follows:

//eg...
ImageGrid("canvas1", "image1", 3, 3, 2, 220, 0, true); //3*3
ImageGrid("canvas1", "image1", 4, 4, 2, 440, 0, true); //4*4
ImageGrid("canvas1", "image1", 3, 4, 2, 660, 0, false); //3*4

The code is very simple, but the effect is very cool. Have you guys learned it?