在现场重新调整大小答案

【问题标题】：Re-size things on site在现场重新调整大小
【发布时间】：2013-07-19 12:46:38
【问题描述】：

我想知道如何制作一个框或图像或任何我想要调整大小的东西，以便用户可以按照他们想要的方式调整对象的大小。我还想知道他们如何在页面上移动这些对象。如果你能告诉我如何通过 CSS 和 HTML 实现这一点，我会很高兴。

谢谢

【问题讨论】：

如果你想要一个浅的学习曲线方式，加载 jQuery 和 jQuery UI ，并查看 JQuery UI 的 Draggable 和 Resizable 功能

【解决方案1】：

这是您想要的代码。 HTML5、CSS 和 Javascript。您可以根据自己的喜好进行更改。此代码正在运行：http://www.html5canvastutorials.com/demos/labs/html5-canvas-drag-and-drop-resize-and-invert-images/index.php

<!DOCTYPE HTML>
<html>
  <head>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
    </style>
  </head>
  <body onmousedown="return false;">
    <div id="container"></div>
    <script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.2.min.js"></script>
    <script>
      function update(activeAnchor) {
        var group = activeAnchor.getParent();

        var topLeft = group.get('.topLeft')[0];
        var topRight = group.get('.topRight')[0];
        var bottomRight = group.get('.bottomRight')[0];
        var bottomLeft = group.get('.bottomLeft')[0];
        var image = group.get('.image')[0];

        var anchorX = activeAnchor.getX();
        var anchorY = activeAnchor.getY();

        // update anchor positions
        switch (activeAnchor.getName()) {
          case 'topLeft':
            topRight.setY(anchorY);
            bottomLeft.setX(anchorX);
            break;
          case 'topRight':
            topLeft.setY(anchorY);
            bottomRight.setX(anchorX);
            break;
          case 'bottomRight':
            bottomLeft.setY(anchorY);
            topRight.setX(anchorX); 
            break;
          case 'bottomLeft':
            bottomRight.setY(anchorY);
            topLeft.setX(anchorX); 
            break;
        }

        image.setPosition(topLeft.getPosition());

        var width = topRight.getX() - topLeft.getX();
        var height = bottomLeft.getY() - topLeft.getY();
        if(width && height) {
          image.setSize(width, height);
        }
      }
      function addAnchor(group, x, y, name) {
        var stage = group.getStage();
        var layer = group.getLayer();

        var anchor = new Kinetic.Circle({
          x: x,
          y: y,
          stroke: '#666',
          fill: '#ddd',
          strokeWidth: 2,
          radius: 8,
          name: name,
          draggable: true,
          dragOnTop: false
        });

        anchor.on('dragmove', function() {
          update(this);
          layer.draw();
        });
        anchor.on('mousedown touchstart', function() {
          group.setDraggable(false);
          this.moveToTop();
        });
        anchor.on('dragend', function() {
          group.setDraggable(true);
          layer.draw();
        });
        // add hover styling
        anchor.on('mouseover', function() {
          var layer = this.getLayer();
          document.body.style.cursor = 'pointer';
          this.setStrokeWidth(4);
          layer.draw();
        });
        anchor.on('mouseout', function() {
          var layer = this.getLayer();
          document.body.style.cursor = 'default';
          this.setStrokeWidth(2);
          layer.draw();
        });

        group.add(anchor);
      }
      function loadImages(sources, callback) {
        var images = {};
        var loadedImages = 0;
        var numImages = 0;
        for(var src in sources) {
          numImages++;
        }
        for(var src in sources) {
          images[src] = new Image();
          images[src].onload = function() {
            if(++loadedImages >= numImages) {
              callback(images);
            }
          };
          images[src].src = sources[src];
        }
      }
      function initStage(images) {
        var stage = new Kinetic.Stage({
          container: 'container',
          width: 578,
          height: 400
        });
        var darthVaderGroup = new Kinetic.Group({
          x: 270,
          y: 100,
          draggable: true
        });
        var yodaGroup = new Kinetic.Group({
          x: 100,
          y: 110,
          draggable: true
        });
        var layer = new Kinetic.Layer();

        /*
         * go ahead and add the groups
         * to the layer and the layer to the
         * stage so that the groups have knowledge
         * of its layer and stage
         */
        layer.add(darthVaderGroup);
        layer.add(yodaGroup);
        stage.add(layer);

        // darth vader
        var darthVaderImg = new Kinetic.Image({
          x: 0,
          y: 0,
          image: images.darthVader,
          width: 200,
          height: 138,
          name: 'image'
        });

        darthVaderGroup.add(darthVaderImg);
        addAnchor(darthVaderGroup, 0, 0, 'topLeft');
        addAnchor(darthVaderGroup, 200, 0, 'topRight');
        addAnchor(darthVaderGroup, 200, 138, 'bottomRight');
        addAnchor(darthVaderGroup, 0, 138, 'bottomLeft');

        darthVaderGroup.on('dragstart', function() {
          this.moveToTop();
        });
        // yoda
        var yodaImg = new Kinetic.Image({
          x: 0,
          y: 0,
          image: images.yoda,
          width: 93,
          height: 104,
          name: 'image'
        });

        yodaGroup.add(yodaImg);
        addAnchor(yodaGroup, 0, 0, 'topLeft');
        addAnchor(yodaGroup, 93, 0, 'topRight');
        addAnchor(yodaGroup, 93, 104, 'bottomRight');
        addAnchor(yodaGroup, 0, 104, 'bottomLeft');

        yodaGroup.on('dragstart', function() {
          this.moveToTop();
        });

        stage.draw();
      }

      var sources = {
        darthVader: 'http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg',
        yoda: 'http://www.html5canvastutorials.com/demos/assets/yoda.jpg'
      };
      loadImages(sources, initStage);

    </script>

  </body>
</html>

【讨论】：

【解决方案2】：

我认为纯 css 和 html 无法实现这样的事情......你需要使用 javascript，为了更轻松的工作，请探索名为 jQuery 的库，它可以让你更轻松地完成这类事情..

【讨论】：

dzordz，谢谢您的回答！你能告诉我在哪里可以获得任何免费资源，所以也许我可以修改它并用于我的需要？
查看@Shaan Singh 的答案，它非常好，如果您想更专业一点，请探索我已链接您的 jQuery 插件并搜索 it's documentation。您在这里获得的精彩演示之一：viralpatel.net/blogs/…
我同意 dzordz。我给出的答案是一个快速简单的解决方法，但从长远来看，学习一些 jQuery 会更好。