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我的总体目标是制作滑动拼图游戏。使用画布,我设法将图像分成多个部分。为了洗牌,我将这些棋子的坐标写成了一个数组,并对坐标进行了洗牌,并在画布上重新绘制了图像。然而,这个难题最终会被一些重复的片断所覆盖!我不知道为什么?!HTML5画布分解图像
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
var img=document.getElementById("map");
//img,sx,sy,swidth,sheight,x,y,width,height
function recreate_map(){
ctx.drawImage(img,0,0,133,100,0,0,133,100);
ctx.drawImage(img,133,0,133,100,133,0,133,100);
ctx.drawImage(img,266,0,133,100,266,0,133,100);
ctx.drawImage(img,0,100,133,100,0,100,133,100);
ctx.drawImage(img,133,100,133,100,133,100,133,100);
ctx.drawImage(img,266,100,133,100,266,100,133,100);
ctx.drawImage(img,0,200,133,100,0,200,133,100);
ctx.drawImage(img,133,200,133,100,133,200,133,100);
ctx.drawImage(img,266,200,133,100,266,200,133,100);
}
function shuffle_array(arr){
var i = arr.length;
while(--i>0){
var n = Math.floor(Math.random()*(i));
var temp = arr[n];
arr[n] = arr[i];
arr[i] = temp;
}
return arr;
}
function shuffle_tiles(){
var positions_x = [0,133,266,0,133,266,0,133,266];
var positions_y = [0,0,0,100,100,100,200,200,200];
shuffle_array(positions_x);
shuffle_array(positions_y);
ctx.drawImage(img,0,0,133,100,positions_x[0],positions_y[0],133,100);
ctx.drawImage(img,133,0,133,100,positions_x[1],positions_y[1],133,100);
ctx.drawImage(img,266,0,133,100,positions_x[2],positions_y[2],133,100);
ctx.drawImage(img,0,100,133,100,positions_x[3],positions_y[3],133,100);
ctx.drawImage(img,133,100,133,100,positions_x[4],positions_y[4],133,100);
ctx.drawImage(img,266,100,133,100,positions_x[5],positions_y[5],133,100);
ctx.drawImage(img,0,200,133,100,positions_x[6],positions_y[6],133,100);
ctx.drawImage(img,133,200,133,100,positions_x[7],positions_y[7],133,100);
ctx.drawImage(img,266,200,133,100,positions_x[8],positions_y[8],133,100);
}
如果有帮助,我在Firefox上使用JS Bin。谢谢。