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组装画板（TDrawBuilder）
在这一小节中我们要把工具条和画板组装起来，让他们可以协同进行工作。
画板通过一个命名为TDrawBuilder来进行组装。在详细讲解TDrawBuilder对象之前我们来看一下程序的HTML代码。
画布由三个Canvas组成
toolbar用于绘制工具条，drawCanvas 用于画图的画布，openCanvas 用于在打开保存的图片时显示小图片。
通过建立一个新的TDrawBuilder对象 new TDrawBuilder(toolbar,drawcanvas,opencanvas),将工具条、画布、小图片显示画布组装起来。
<div id="mainForm" class="mainForm" align="center" >
<canvas id="toolbar" width="780" height="105" >你的浏览器不支持HTML Canvas</canvas>
<canvas id="drawCanvas" width="760" height="440" style="margin-top: 10px;margin-left: 2px;border:2px solid black; background-color: white" >你的浏览器不支持HTML Canvas</canvas>
<canvas id="openCanvas" width="760" height="440" style="margin-top: 10px;margin-left: 2px;border:2px solid black; background-color: white" >你的浏览器不支持HTML Canvas</canvas>
<script type="text/javascript">
var toolbar=document.getElementById(‘toolbar‘);
var drawcanvas=document.getElementById(‘drawCanvas‘);
var opencanvas=document.getElementById(‘openCanvas‘);
opencanvas.style.visibility="hidden";
<span style="color:#ff0000;">var drawBuilder=new TDrawBuilder(toolbar,drawcanvas,opencanvas);</span>
<span style="color:#ff0000;"> var drawHandler=new TDrawHandler(drawcanvas,drawBuilder.getToolbarIns());
drawBuilder.setDrawHandler(drawHandler);</span>
</script>
function BuildToolbar() {
BuildCommandButton();
BuildLineStyle();
BuildColor();
BuildNewFunction();
BuildSaveFunction();
BuildOpenFunction();
Toolbar.InstallEvents();
}
function BuildCommandButton() {
//直线按钮
btnList[0] = new TImageButton(1, "Images/lineNormal.png", "Images/lineMoveOn.png", "Images/lineMouseDown.png", CurrentLeft, 8, 32, 32, Toolbar, 1);
Toolbar.AddButton(btnList[0]);
CurrentLeft = CurrentLeft + 32 + 10;
//直线按钮
btnList[1] = new TImageButton(2, "Images/rectNormal.png", "Images/rectMoveOn.png", "Images/rectMouseDown.png", CurrentLeft, 8, 32, 32, Toolbar, 1);
Toolbar.AddButton(btnList[1]);
//直线按钮
CurrentLeft = CurrentLeft + 32 + 10;
btnList[2] = new TImageButton(3, "Images/arcNormal.png", "Images/arcMoveOn.png", "Images/arcMouseDown.png", CurrentLeft, 8, 32, 32, Toolbar, 1);
Toolbar.AddButton(btnList[2]);
}
function BuildLineStyle() {
var Top = 2;
CurrentLeft = CurrentLeft + 50;
LineStyles[0] = new TImageButton(1, "Images/W1N.png", "Images/W1M.png", "Images/w1d.png", CurrentLeft, Top, 128, 16, Toolbar, 2);
Toolbar.AddButton(LineStyles[0]);
Top = Top + 14;
LineStyles[1] = new TImageButton(2, "Images/W2N.png", "Images/W2M.png", "Images/w2d.png", CurrentLeft, Top, 128, 16, Toolbar, 2);
Toolbar.AddButton(LineStyles[1]);
Top = Top + 14;
LineStyles[2] = new TImageButton(3, "Images/W3N.png", "Images/W3M.png", "Images/w3d.png", CurrentLeft, Top, 128, 16, Toolbar, 2);
Toolbar.AddButton(LineStyles[2]);
Top = Top + 14;
LineStyles[3] = new TImageButton(4, "Images/W4N.png", "Images/W4M.png", "Images/w4d.png", CurrentLeft, Top, 128, 16, Toolbar, 2);
Toolbar.AddButton(LineStyles[3]);
Top = Top + 14;
LineStyles[4] = new TImageButton(5, "Images/W5N.png", "Images/W5M.png", "Images/w5d.png", CurrentLeft, Top, 128, 16, Toolbar, 2);
Toolbar.AddButton(LineStyles[4]);
Top = Top + 14;
LineStyles[5] = new TImageButton(6, "Images/W6N.png", "Images/W6M.png", "Images/w6d.png", CurrentLeft, Top, 128, 16, Toolbar, 2);
Toolbar.AddButton(LineStyles[5]);
Top = Top + 14;
CurrentLeft = CurrentLeft + 140;
}
function BuildColor() {
var Top = 2;
var Left = CurrentLeft;
var ColorArray = ["#000000", "#333333", "#666666", "#999999", "#CCCCCC", "#FFFFFF", "#FF0000", "#00FF00", "#0000FF", "#FFFF00", "#00FFFF", "#FF00FF"];
var ColorButtons = new Array();
for (var i = 0; i < ColorArray.length; i++) {
if ((i % 4) == 0) {
Left = CurrentLeft;
Top = 2 + (Math.floor(i / 4)) * 26;
} else
Left = CurrentLeft + (i % 4) * 26;
ColorButtons[i] = new TColorButton(ColorArray[i], Left, Top, 24, 24, Toolbar, 3);
Toolbar.AddButton(ColorButtons[i]);
}
var CurrentBorderColor = new TColorButton("black", CurrentLeft + 4 * 26 + 10, 8, 64, 64, Toolbar, 4);
Toolbar.AddButton(CurrentBorderColor);
Toolbar.setBorderColorButton(CurrentBorderColor);
CurrentLeft = CurrentLeft + 4 * 26 + 74;
}
function BuildNewFunction() {
CurrentLeft = CurrentLeft + 10;
NewButton = new TImageButton(1, "Images/newNormal.png", "Images/newNormal.png", "Images/newMove.png", CurrentLeft, 8, 64, 64, Toolbar, 5);
NewButton.OnClick = function() {
DoNewDrawing();
};
Toolbar.AddButton(NewButton);
CurrentLeft = CurrentLeft + 64;
}
function DoNewDrawing() {
Drawhandler.NewDrawing();
Drawhandler.setId(NewGuid(true));
}
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原文地址：http://www.cnblogs.com/gongzt/p/build_drawpanel.html
