CAD控件（插件）：COM接口实现自定义实体

lihao2014 · 发表于 1970-1-1 08:00:00

COM接口实现自定义实体

1、实现步骤： 3

1、实现步骤：

参考例子：Src\MxDraw5.2\samples\ie\iedemoTest.htm

1) 增加自定义实体对象

调用DrawCustomEntity函数，绘制一个自定义实体对象

函数说明如下:

file:///C:/Users/ADMINI~1/AppData/Local/Temp/ksohtml/wps911A.tmp.jpg

JS例子，下面代码绘制一个自定义实体，设置了两个属性，属性名分别” startpoint”,” endpoint”的两个点坐标，

// 插入自定义实体函数

function InsertCustomEntity() {

var getPt = mxOcx.NewComObject("IMxDrawUiPrPoint");

getPt.message = "点取第一点";

if (getPt.go() != 1)

return;

var frstPt = getPt.value();

if (frstPt == null)

return;

var getSecondPt = mxOcx.NewComObject("IMxDrawUiPrPoint");

getSecondPt.message = "点取第二点";

getSecondPt.basePoint = frstPt;

getSecondPt.setUseBasePt(true);

if (getSecondPt.go() != 1)

return;

var secondPt = getSecondPt.value();

if (secondPt == null)

return;

var ent = mxOcx.DrawCustomEntity("TestMxCustomEntity", "");

ent.SetPoint("spt", frstPt);

ent.SetPoint("ept", secondPt);

};

2) 响应自定义事件，绘制自定义实体

需要响应DMxDrawXEvents::CustomEntity_Explode事件

帮助如下：

file:///C:/Users/ADMINI~1/AppData/Local/Temp/ksohtml/wps913A.tmp.jpg

JS例子，下面例子，得到自实体的数据，根据自定义实体的两个必属，开始点，和结束点绘制一个直线

// 自定义实体绘制函数

function ExplodeFun(pCustomEntity, pWorldDraw) {

var sGuid = pCustomEntity.Guid;

if (sGuid == "TestMxCustomEntity") {

if (!pCustomEntity.IsHave("ept"))

return;

var stp = pCustomEntity.GetPoint("spt");

if (stp == null)

return;

var ept = pCustomEntity.GetPoint("ept");

if (ept == null)

return;

var mxUtility = mxOcx.NewUtility();

var vec = ept.SumVector(stp);

vec.Mult(0.5);

var midPt = mxOcx.NewPoint();

midPt.x = stp.x;

midPt.y = stp.y;

midPt.Add(vec);

var dAng = vec.Angle();

dAng = mxUtility.GetDimAngle(dAng);

var dDis = 0.0;

dDis = stp.DistanceTo(ept);

var sTxt = "L=" + formatNumber(dDis, '#.##');

dAng = dAng * 180.0 / 3.14159265;

vec.RotateByXyPlan(3.14159265 / 2.0);

vec.Normalize();

vec.Mult(10);

stp.Add(vec);

ept.Add(vec);

pWorldDraw.DrawLine(stp.x, stp.y, ept.x, ept.y);

vec.Mult(2);

stp.Sum(vec);

ept.Sum(vec);

pWorldDraw.DrawLine(stp.x, stp.y, ept.x, ept.y);

pWorldDraw.SetColorIndex(1);

pWorldDraw.DrawText(midPt.x, midPt.y, sTxt, 5, dAng,

1, 2);

mxOcx.SetEventRet(1);

}

3) 响应自定义事件，返回自定义实体夹点

需要响应_DMxDrawXEvents::CustomEntity_getGripPoints事件

帮助如下：

file:///C:/Users/ADMINI~1/AppData/Local/Temp/ksohtml/wps915A.tmp.jpg

JS例子，返回自定义实体的开始夹点，和结束夹点。

// 返回自定义实体夹点

function GetGripPointsFun(pCustomEntity) {

var sGuid = pCustomEntity.Guid;

if (sGuid == "TestMxCustomEntity") {

if (!pCustomEntity.IsHave("ept"))

return;

var stp = pCustomEntity.GetPoint("spt");

if (stp == null)

return;

var ept = pCustomEntity.GetPoint("ept");

if (ept == null)

return;

var ret = mxOcx.NewResbuf();

ret.AddPoint(stp);

ret.AddPoint(ept);

mxOcx.SetEventRetEx(ret);

}

4) 响应自定义事件，夹点移动后的处理

需要响应CustomEntity_moveGripPointsAt事件

帮助如下：

file:///C:/Users/ADMINI~1/AppData/Local/Temp/ksohtml/wps918A.tmp.jpg

JS例子，夹点移动后，修改自定义实体的属性

// 移动自定义实体夹点

function MoveGripPointsFun(pCustomEntity, lGridIndex, dOffsetX, dOffsetY) {

var sGuid = pCustomEntity.Guid;

if (sGuid == "TestMxCustomEntity") {

if (!pCustomEntity.IsHave("ept"))

return;

var stp = pCustomEntity.GetPoint("spt");

if (stp == null)

return;

var ept = pCustomEntity.GetPoint("ept");

if (ept == null)

return;

if (lGridIndex == 0) {

stp.x = stp.x + dOffsetX;

stp.y = stp.y + dOffsetY;

pCustomEntity.SetPoint("spt", stp);

}

else {

ept.x = ept.x + dOffsetX;

ept.y = ept.y + dOffsetY;

pCustomEntity.SetPoint("ept", ept);

}

mxOcx.SetEventRet(1);

}

chenhaijunsjy · 发表于 1970-1-1 08:00:00

非常感谢！谢谢分享！

[软件交流] CAD控件（插件）：COM接口实现自定义实体

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