脚本
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* VMLgraph.js
*************
var xo=0;
var yo=0;
var ox=80;
var oy=20;
var dx=0;
var dy=0;
var drawKey = false;
var itemID = 0;
var ShapeItemNum = 0;
var ShapeItemX = 0;
var ShapeItemY = 0;
var CurveItemNum = 0;
var NodeDelete = false;
var ToolBarNum = 2; // 预置的工具编号
var gradientX = -1;

function cursor(k) {
  xo = event.clientX - ox;
  yo = event.clientY - oy;
  if(k && xo>=0 && yo>=0)
    oxy.innerHTML = xo+","+yo;
  else
    oxy.innerHTML = "";
  if(drawKey) {
    paint();
    view.innerHTML = tree(canvas.documentElement,0);
  }
}

function setOverColor(v) {
  if(! NodeDelete) return;
  v.myColor = v.strokecolor;
  if(v.strokecolor == "red")
    v.strokecolor='#000000';
  else
    v.strokecolor='#ff0000';
}
function setOutColor(v) {
  if(! NodeDelete) return;
  v.strokecolor = v.myColor;
  view.innerHTML = tree(canvas.documentElement,0);
}
function deleteNode(v) {
  if(! NodeDelete) return;
  var id = v.id;
  for(i=0;i<canvas.selectNodes("/*//*").length;i++) {
    var node = canvas.selectNodes("/*//*")[i];
    if(node.getAttribute("id") == id) {
      canvas.documentElement.childNodes[0].removeChild(node);
      view.innerHTML = tree(canvas.documentElement,0);
      return;
    }
  }
}

function setElement(node) {
  node.setAttribute("id") = itemID;
  node.setAttribute("myColor") = "#";
  node.setAttribute("onMouseOver") = "setOverColor(this)";
  node.setAttribute("onMouseOut") = "setOutColor(this)";
  node.setAttribute("onClick") = "deleteNode(this)";

  var subobjField = canvas.createElement("v:stroke");
  subobjField.setAttribute("color") = color1.fillcolor;
  subobjField.setAttribute("dashstyle") = dashstyle.dashstyle;
  node.appendChild(subobjField);
  if(textbox.style.visibility == "visible" && txt.value.length) {
    var subobjField = canvas.createElement("v:path");
    subobjField.setAttribute("textpathok") = "true";
    node.appendChild(subobjField);
    var subobjField = canvas.createElement("v:textpath");
    subobjField.setAttribute("on") = "true";
    subobjField.setAttribute("string") = txt.value;
    subobjField.setAttribute("style") = "font:normal normal normal 16pt 'Arial Black'";
    node.appendChild(subobjField);
  }
  canvas.documentElement.childNodes[0].appendChild(node);
}

function mouse_down() {
  drawKey = true;
  dx = xo;