标签：javascript mxgraph 图形 overlay 坐标
首先要创建一个工具栏，并为工具栏中的放大、缩小按钮定义事件。
<div id="toolbar" style="float:left;margin-top:5px;margin-left: 5px;line-height: 35px;">
<img src="src/images/zoomin.gif" action="zoomIn" title="放大" width="16" height="16" />
<img src="src/images/zoomout.gif" action="zoomOut" title="缩小" width="16" height="16" />
</div>
var canvas=ylEditor.ylCanvas;//ylEditor.ylCanvas是我定义的一个mxGraph实例的全局对象。
var toolbar= $('#toolbar');
toolbar.find('img').css( {
'margin-right' : '5px',
'cursor' : 'pointer'
}).click(function() {
switch ($(this).attr('action')) {
case 'zoomIn':
canvas.zoomIn();
break;
case 'zoomOut':
canvas.zoomOut();
break;
}
});ylCommon.createOverlay = function (cell) {
var canvas=ylEditor.ylCanvas;
var img, point, align = 'left', title;
var iconSize = 16;
img = '../../images/icon-unlock.png';
title = '已解锁-点击锁定';
point = new mxPoint(cell.geometry.width - 15, 10);
var overlay = new mxCellOverlay(new mxImage(img, iconSize, iconSize), title, align, 'top', point, 'pointer');
overlay.addListener(mxEvent.CLICK, function (sender, evt2) {
//do something
});
canvas.addCellOverlay(cell, overlay);
img = '../../images/icon-diagram.png';
title = '辐射图';
point = new mxPoint(cell.geometry.width - 35, 10);
overlay = new mxCellOverlay(new mxImage(img, iconSize, iconSize), title, align, 'top', point, 'pointer');
overlay.addListener(mxEvent.CLICK, function (sender, evt2) {
//do something
});
canvas.addCellOverlay(cell, overlay);
img = 'src/images/properties.gif';
title = '属性';
point = new mxPoint(27, 10);
overlay = new mxCellOverlay(new mxImage(img, iconSize, iconSize), title, align, 'top', point, 'pointer');
overlay.addListener(mxEvent.CLICK, function (sender, evt2) {
//do something
});
canvas.addCellOverlay(cell, overlay);
}
执行以上代码，在IE下正常，在火狐和谷歌浏览器下显示不正常，overlay图标位置没有发生改变。主要原因是因为调用zoomIn()和zoomOut()方法之后画布显示比例发生了变化，而overlay的坐标是固定的。那么只要对overlay坐标也根据这个比例来创建是不是就解决问题了呢？好，下面就来改造创建overlay的这个方法。
ylCommon.createOverlay = function (cell) {
var canvas=ylEditor.ylCanvas;
var img, point, align = 'left', title;
var iconSize = 16;
var scale=canvas.getView().getScale();//获取当前画布的显示比例，把坐标的x,y都乘以这个比例
img = '../../images/icon-unlock.png';
title = '已解锁-点击锁定';
point = new mxPoint((cell.geometry.width - 15)*scale, 10*scale);
var overlay = new mxCellOverlay(new mxImage(img, iconSize, iconSize), title, align, 'top', point, 'pointer');
overlay.addListener(mxEvent.CLICK, function (sender, evt2) {
//do something
});
canvas.addCellOverlay(cell, overlay);
img = '../../images/icon-diagram.png';
title = '辐射图';
point = new mxPoint((cell.geometry.width - 35)*scale, 10*scale);
overlay = new mxCellOverlay(new mxImage(img, iconSize, iconSize), title, align, 'top', point, 'pointer');
overlay.addListener(mxEvent.CLICK, function (sender, evt2) {
//do something
});
canvas.addCellOverlay(cell, overlay);
img = 'src/images/properties.gif';
title = '属性';
point = new mxPoint(27*scale, 10*scale);
overlay = new mxCellOverlay(new mxImage(img, iconSize, iconSize), title, align, 'top', point, 'pointer');
overlay.addListener(mxEvent.CLICK, function (sender, evt2) {
//do something
});
canvas.addCellOverlay(cell, overlay);
}
改造完成，问题是否解决了呢？经过验证，并没有解决，这是为什么呢？可能是因为这个方法只是针对创建overlay的时候生效，在执行放大缩小的时候，并不会再重新创建overlay。我想当然的认为mxGraph会根据这个比例来重新渲染overlay。好吧，那我就在执行放大缩小之后，再重新创建一下overlay的好了。
定义一个重新创建overlay的方法。
ylCommon.resetOverlay=function(){
var scale=ylEditor.ylCanvas.getView().getScale();
var oldSelectCells=ylEditor.ylCanvas.getSelectionCells();//获取当前选中的图形
if(!mxClient.IS_IE){
ylEditor.ylCanvas.selectAll();
var cells=ylEditor.ylCanvas.getSelectionCells();
ylEditor.ylCanvas.clearSelection();
ylEditor.ylCanvas.setSelectionCells(oldSelectCells);//重新选中
ylEditor.ylModel.beginUpdate();
for(var i=0;i<cells.length;i++){
ylEditor.ylCanvas.clearCellOverlays(cells[i]);//移除overlay
ylCommon.createOverlay(cells[i]);//重新创建overlay
}
ylEditor.ylModel.endUpdate();
}
}toolbar.find('img').css( {
'margin-right' : '5px',
'cursor' : 'pointer'
}).click(function() {
switch ($(this).attr('action')) {
case 'zoomIn':
canvas.zoomIn();
ylCommon.resetOverlay();
break;
case 'zoomOut':
canvas.zoomOut();
ylCommon.resetOverlay();
break;
}
});好了，问题终于解决了。解决mxGraph放大/缩小在非IE浏览器下overlay图标位置不变化的问题,布布扣,bubuko.com
解决mxGraph放大/缩小在非IE浏览器下overlay图标位置不变化的问题
标签：javascript mxgraph 图形 overlay 坐标
原文地址：http://blog.csdn.net/gua_381091614/article/details/37321389
