使用html或javascript从sprite表中提取单个帧

Question

I have a sprite sheet consisting of 12 frames. 我有一个由12帧组成的Sprite工作表。

在此处输入图片说明

I want to extract each individual frame from it and want to show it in different canvas like below. 我想从中提取每个单独的框架，并希望将其显示在如下所示的不同画布中。 在此处输入图片说明

what i have tried so far is posted below 我到目前为止已经尝试过的东西发布在下面

//HTML code for define the canvas area . 

   <body onload="image_render();">

      <div id="image_area">  <canvas id="image"></canvas></div>
        <script src="sprite_demo.js"></script>
    </body> 


 // javascript to slice the image and assign to the canvas

var canvasImage = new Image();
canvasImage.src = "image/sprite_xxdpi.jpg";
var can= document.getElementById("image");
can.width = 500;
can.height = 300;


function image_render()
{

coin.render();
}

var coin = sprite({
    context: can.getContext("2d"),
    width: 500,
    height: 300,
    image: coinImage

});

function sprite (options) { 
    var that = {};              
    that.context = options.context;
    that.width = options.width;
    that.height = options.height;
    that.image = options.image; 

    that.render = function () {

        // Draw the animation
        that.context.drawImage(
           that.image,
           0,          //X-axis starting position from where slicing begins
           0,          //y-axis starting position from where slicing begins
           that.width, //width of slicing image
           that.height,//height of slicing image
           0,          //X-axis starting position where image will be drawn
           0,          //y-axis starting position where image will be drawn
           150,        // width of the resulting image
           150);      //height of the resulting image

    };


    return that;

}

I am only able to get a single image ,But I want to get all the images to show in a grid.And also i want to get the image to show any where I want. 我只能得到一个图像，但是我想使所有图像显示在网格中。我也想使图像显示在我想要的任何位置。 I also want to scale down big size images to show in a grid and while taping on it I want to show the original image. 我还想按比例缩小大尺寸图像以显示在网格中，同时点击它，我想显示原始图像。

Note: I don't want to animate my frames, I just want to show in grid. 注意：我不想设置帧动画，我只想显示在网格中。 There are mostly examples of sprite animation available on internet. Internet上主要有Sprite动画的示例。

Answer 1

You have the correct version of drawImage to clip individual sprites from the spritesheet, but you must alter the values in drawImage for each sprite. 您具有正确的drawImage版本，可以从spritesheet剪切单个sprite，但是必须为每个sprite更改drawImage中的值。

The "faces" example spritesheet you show appear to have equal sized individual sprites (75px by 75px). 您显示的“面孔”示例精灵表格似乎具有相等大小的单独精灵（75px x 75px）。

Assuming all your sprites are the same size, you would alter the 2nd & 3rd drawImage parameters which tell canvas the top-left x/y coordinate to begin clipping on the spritesheet. 假设所有精灵大小相同，则可以更改第二和第三drawImage参数，这些参数告诉画布左上角的x / y坐标开始在精灵板上进行裁剪。

Here's example code and a Demo: http://jsfiddle.net/m1erickson/tVD2K/ 这是示例代码和演示： http : //jsfiddle.net/m1erickson/tVD2K/

<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
    body{ background-color: ivory; }
    canvas{border:1px solid red;}
</style>
<script>
$(function(){

    var canvas=document.getElementById("canvas");
    var ctx=canvas.getContext("2d");

    var spriteWidth=75;
    var spriteHeight=75;
    var spriteCols=4;
    var spriteRows=3;
    var y=20-sprightHeight;

    var img=new Image();
    img.onload=start;
    img.src="https://dl.dropboxusercontent.com/u/139992952/multple/spritesheet1.jpg";
    function start(){
        var canvasY=0;
        for(var col=0;col<spriteCols;col++){
        for(var row=0;row<spriteRows;row++){
            var sourceX=col*spriteWidth;
            var sourceY=row*spriteHeight;
            // testing: calc a random position to draw this sprite
            // on the canvas
            var canvasX=Math.random()*150+20;
            canvasY+=spriteHeight+5;
            // drawImage with changing source and canvas x/y positions
            ctx.drawImage(img,
                sourceX,sourceY,spriteWidth,spriteHeight,
                canvasX,canvasY,spriteWidth,spriteHeight
            );
        }}
    }

}); // end $(function(){});
</script>
</head>
<body>
    <h4>Draw individual sprites from a spritesheet</h4>
    <canvas id="canvas" width=300 height=1000></canvas>
</body>
</html>

在此处输入图片说明

使用html或javascript从sprite表中提取单个帧

问题描述

1 个解决方案

解决方案1
3 已采纳 2014-06-04 16:23:28

使用html或javascript从sprite表中提取单个帧

问题描述

1 个解决方案

解决方案1 3 已采纳 2014-06-04 16:23:28

解决方案1
3 已采纳 2014-06-04 16:23:28