JavaScript+html5 canvas绘制的小人效果

前端技术 2023/08/09 JavaScript

本文实例讲述了JavaScript+html5 canvas绘制的小人效果。分享给大家供大家参考，具体如下：

运行效果截图如下：

index.html代码如下：

<!DOCTYPE html>
<html>
 <head>
  <meta http-equiv=\"Content-type\" content=\"text/html;charset=UTF-8\" />
  <title>canvas中的缩放</title>
  <style type=\"text/css\">
   #canvas {
    background:black; margin-top:100px; margin-left:200px;
   }
  </style>
 </head>
 <body>
  <canvas id=\"canvas\" width=\"500px\" height=\"500px\" ></canvas>
 </body>
 <script type=\"text/javascript\" src=\"canvas.js\"></script>
 <script type=\"text/javascript\">
  cache = {};
  var offsetX = 50,
   offsetY = 20;
  cache.context = dyl.createContext(\'canvas\');
  dyl.rect(dyl.createColor(), 60 + offsetX, 0 + offsetY, 185, 100);
  dyl.rect(dyl.createColor(), 100 + offsetX, 100 + offsetY, 100, 50);
  dyl.rect(dyl.createColor(), 20 + offsetX, 150 + offsetY, 260, 200);
  dyl.rect(dyl.createColor(), 80 + offsetX, 350 + offsetY, 30, 110);
  dyl.rect(dyl.createColor(), 190 + offsetX, 350 + offsetY, 30, 110);
  dyl.circle(dyl.createColor(), 115 + offsetX, 55, 20);
  dyl.circle(dyl.createColor(), 190 + offsetX, 55, 20);
 </script>
</html>

canvas.js代码如下：

(function() {
  var dyl = {cache: {}};
  dyl.setContext = function(context) {
    dyl.cache._context = context;
    return context;
  }
  dyl.getDom = function(id) {
    return document.getElementById(id);
  }
  dyl._getContext = function() {
    return dyl.cache._context;
  }
  dyl.save = function() {
    var context = dyl._getContext();
    context ? context.save() : void(0);
  }
  dyl.restore = function() {
    var context = dyl._getContext();
    context ? context.restore() : void(0);
  }
  dyl.createContext = function(canvasID) {
    var canvas = this.getDom(canvasID);
    if(!canvas) {
      return null;
    }
    return dyl.setContext(canvas.getContext(\"2d\"));
  }
  dyl.createColor = function() {
    var color = \"rgb(\";
    color += Math.round(Math.random()*255);
    color += \",\";
    color += Math.round(Math.random()*255);
    color += \",\";
    color += Math.round(Math.random()*255);
    color += \")\";
    return color;
  };
  dyl.addImg = function(img, x, y) {
    var context = dyl._getContext();
    if(!img || !context) {
      return;
    }
    if(typeof img === \"string\") {
      var oImg = new Image();
      oImg.src = img;
      oImg.onload = function() {
        context.drawImage(oImg, x, y);
      }
      return;
    } 
    context.drawImage(img, x, y);
  };
  dyl.rect = function(color, x, y, width, height) {
    var context = dyl._getContext();
    if(!context) {
      return;
    }
    context.fillStyle = color;
    context.fillRect(x, y, width, height);
  };
  dyl.circle = function(color, x, y, r) {
    var context = dyl._getContext();
    context.save();
    context.fillStyle = color;
    context.beginPath();
    context.arc(x, y, r, 0, 2*Math.PI);
    context.fill();
    context.stroke();
  };
  dyl.scale = function(x, y) {
    var context = dyl._getContext();
    if(!context) {
      return;
    }
    x = x ? x : 1;
    y = y ? y : 1;
    context.scale(x, y);
  };
  if(!window.dyl) {
    window.dyl = dyl;
  }
})();

更多关于js特效相关内容感兴趣的读者可查看本站专题：《jQuery动画与特效用法总结》、《jQuery常见经典特效汇总》及《JavaScript动画特效与技巧汇总》

希望本文所述对大家JavaScript程序设计有所帮助。

本文地址：https://www.stayed.cn/item/723

转载请注明出处。

本站部分内容来源于网络,如侵犯到您的权益,请 联系我

我的博客

人生若只如初见，何事秋风悲画扇。

我的标签

随笔档案