【039】Geometry 总结

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●·● 目录：

A1 ………… Geometry 总结
A2 ………… 绘制几何图形 —— 圆
A3 ………… 绘制几何图形 —— 椭圆
A4 ………… 绘制几何图形 —— 圆弧
A5 ………… 绘制几何图形 —— 椭圆弧
A6 ………… VS2008打开VS2010项目
A7 ………… Visual Studio 2008“分析 EntityName 时出错。 行 2，位置 81。”报错解决！
A8 ………… 类、接口等的引用传递的理解
A9 ………… DrawShape 与 AddElement 显示图形的区别

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●·● Geometry 总结：

1. Polyline：是 Path 的集合，可以实现 IGeometryCollection 接口，用于添加几何图形！
2. Path：由 Segment 组成，可以实现 ISegmentCollection 接口，用于添加 Segment！
3. Polygon：是 Ring 的集合，可以实现 IGeometryCollection 接口，用于添加几何图形！
4. Ring：由 Segment 组成，可以实现 ISegmentCollection 接口，用于添加 Segment！
5. Segment：包括 Line、CircularArc、EllipticArc、BezierCurve 四个！

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●·● 绘制几何图形 —— 圆：

1. 构造圆心点，IPoint。
2. 构造圆弧，IConstructCircularArc，通过此接口，利用圆心和半径来确定圆弧。
3. 构造线段，ISegment，将圆弧转为线段接口，用于添加到下面的线段集合中。
4. 构造线段集合，ISegmentCollection，将上面的线段添加进来。
5. 构造环，IRing，将线段集合转为环接口，用于实现图形的 Close 。
6. 构造几何图形集合：IGeometryCollection，将上面的环添加到几何图形集合中，然后就可以用了。

有填充颜色的：

IPoint pPoint = new PointClass();
pPoint.X = 110;
pPoint.Y = 40;

//构建圆对象
IConstructCircularArc pConstructCircularArc = new CircularArcClass();
pConstructCircularArc.ConstructCircle(pPoint, 20, false);
ICircularArc pArc = pConstructCircularArc as ICircularArc;　　//不必要
ISegment pSegment1 = pArc as ISegment;

//通过ISegmentCollection构建Ring对象
ISegmentCollection pSegCollection = new RingClass();
object o = Type.Missing;

//添加Segement对象即圆
pSegCollection.AddSegment(pSegment1, ref o, ref o);

//QI到IRing接口封闭Ring对象，使其有效
IRing pRing = pSegCollection as IRing;
pRing.Close();

//通过Ring对象使用IGeometryCollection构建Polygon对象
IGeometryCollection pGeometryColl = new PolygonClass();
pGeometryColl.AddGeometry(pRing, ref o, ref o);

//构建一个CircleElement对象
IElement pElement = new CircleElementClass();

pElement.Geometry = pGeometryColl as IGeometry;
IGraphicsContainer pGC = this.axMapControl1.ActiveView.GraphicsContainer;
pGC.AddElement(pElement, 0);
this.axMapControl1.Refresh();

没有填充颜色的，只需加入下面一句，使其为透明颜色即可！

pColor.Transparency = 0;

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●·● 绘制几何图形 —— 椭圆：

1. 构造两个点，IPoint。
2. 构造包络线也就是矩形，IEnvelope，通过上面的两个点。
3. 构造圆弧，IConstructEllipticArc，通过此接口，利用矩形来确定椭圆弧。
4. 构造线段，ISegment，将椭圆弧转为线段接口，用于添加到下面的线段集合中。
5. 构造线段集合，ISegmentCollection，将上面的线段添加进来。
6. 构造环，IRing，将线段集合转为环接口，用于实现图形的 Close 。
7. 构造几何图形集合：IGeometryCollection，将上面的环添加到几何图形集合中，然后就可以用了。

有填充颜色的：

IPoint pPoint1 = new PointClass();
pPoint1.PutCoords(80, 20);
IPoint pPoint2 = new PointClass();
pPoint2.PutCoords(130, 50);
IEnvelope pEnvelope = new EnvelopeClass();
pEnvelope.LowerLeft = pPoint1;
pEnvelope.UpperRight = pPoint2;
IConstructEllipticArc pConstructEllipticArc = new EllipticArcClass();
pConstructEllipticArc.ConstructEnvelope(pEnvelope);

IEllipticArc pEllipticArc = pConstructEllipticArc as IEllipticArc;　　//不必要
ISegment pSegment = pEllipticArc as ISegment;

ISegmentCollection pSegmentCollection = new RingClass();
object o = Type.Missing;
pSegmentCollection.AddSegment(pSegment, ref o, ref o);

IRing pRing = pSegmentCollection as IRing;
pRing.Close();

IGeometryCollection pGeometryColl = new PolygonClass();
pGeometryColl.AddGeometry(pRing, ref o, ref o);

ISimpleLineSymbol pSimpleLineSym = new SimpleLineSymbol();
pSimpleLineSym.Color = GetColor(0, 0, 0);
pSimpleLineSym.Width = 2;

ISimpleFillSymbol pSimpleFillSym = new SimpleFillSymbol();
IRgbColor pColor = new RgbColor();
pColor.Red = 255;
pColor.Green = 255;
pSimpleFillSym.Color = pColor;
pSimpleFillSym.Outline = pSimpleLineSym;

IElement pElement = new EllipseElementClass();
pElement.Geometry = pGeometryColl as IGeometry;
IFillShapeElement pFillShapeElement = pElement as IFillShapeElement;
pFillShapeElement.Symbol = pSimpleFillSym;

IGraphicsContainer pGC = axMapControl1.ActiveView.GraphicsContainer;
pGC.AddElement(pElement, 0);
axMapControl1.Refresh();

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●·● 绘制几何图形 —— 圆弧：

1. 构造圆心点，IPoint。
2. 构造圆弧，IConstructCircularArc，通过此接口，利用圆心、半径、起始角度，中心角来确定圆弧。
3. 构造线段，ISegment，将圆弧转为线段接口，用于添加到下面的线段集合中。
4. 构造线段集合，ISegmentCollection，将上面的线段添加进来。
5. 构造环或者路径，IRing or IPath，将线段集合转为环接口或是路径接口 。
6. 构造几何图形集合：IGeometryCollection，将上面的环添加到几何图形集合中，然后就可以用了。

IPoint pPoint = new PointClass();
pPoint.X = 80;
pPoint.Y = 40;

IConstructCircularArc pConstructCircularArc = new CircularArcClass();
pConstructCircularArc.ConstructBearingRadiusAngle(pPoint, 0, false, 20, Math.PI*4/3);
ICircularArc pArc = pConstructCircularArc as ICircularArc;　　//不必要
ISegment pSegment1 = pArc as ISegment;
ISegmentCollection pSegCollection = new RingClass();
object o = Type.Missing;
pSegCollection.AddSegment(pSegment1, ref o, ref o);
IRing pRing = pSegCollection as IRing;
//IPath pRing = pSegCollection as IPath;　　//也可以的
IGeometryCollection pGeometryColl = new PolygonClass();
pGeometryColl.AddGeometry(pRing, ref o, ref o);

ISimpleLineSymbol pSimpleLineSym = new SimpleLineSymbol();
pSimpleLineSym.Color = GetColor(0, 0, 0);
pSimpleLineSym.Width = 2;

ISimpleFillSymbol pSimpleFillSym = new SimpleFillSymbol();
IRgbColor pColor = new RgbColor();
pColor.RGB = 255;
//pColor.Transparency = 0;　　//透明填充
pSimpleFillSym.Color = pColor;
pSimpleFillSym.Outline = pSimpleLineSym;

IElement pElement = new CircleElementClass();
IFillShapeElement pFillShapeEle = pElement as IFillShapeElement;
pFillShapeEle.Symbol = pSimpleFillSym;

pElement.Geometry = pGeometryColl as IGeometry;
IGraphicsContainer pGC = this.axMapControl1.ActiveView.GraphicsContainer;
pGC.AddElement(pElement, 0);
this.axMapControl1.Refresh();

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●·● 绘制几何图形 —— 椭圆弧：

1. 实现画¼圆弧：Construct an elliptic arc that starts at fromPoint, goes to toPoint, and spans an angle of pi/2. The rotation of the ellipse will be either 0 or pi/2.

IPoint pPoint1 = new PointClass();
pPoint1.PutCoords(105, 20);
IPoint pPoint2 = new PointClass();
pPoint2.PutCoords(130, 35);
IEnvelope pEnvelope = new EnvelopeClass();
pEnvelope.LowerLeft = pPoint1;
pEnvelope.UpperRight = pPoint2;
IConstructEllipticArc pConstructEllipticArc = new EllipticArcClass();
pConstructEllipticArc.ConstructQuarterEllipse(pPoint1, pPoint2, true);　　//第三个参数决定顺逆时针！
ISegment pSegment = pConstructEllipticArc as ISegment;
ISegmentCollection pSegmentCollection = new RingClass();
object o = Type.Missing;
pSegmentCollection.AddSegment(pSegment, ref o, ref o);
IRing pRing = pSegmentCollection as IRing;
IGeometryCollection pGeometryColl = new PolygonClass();
pGeometryColl.AddGeometry(pRing, ref o, ref o);

ISimpleLineSymbol pSimpleLineSym = new SimpleLineSymbol();
pSimpleLineSym.Color = GetColor(0, 0, 0);
pSimpleLineSym.Width = 2;
ISimpleFillSymbol pSimpleFillSym = new SimpleFillSymbol();
IRgbColor pColor = new RgbColor();
pColor.Red = 255;
pSimpleFillSym.Color = pColor;
pSimpleFillSym.Outline = pSimpleLineSym;

IElement pElement = new EllipseElementClass();
pElement.Geometry = pGeometryColl as IGeometry;
IFillShapeElement pFillShapeElement = pElement as IFillShapeElement;
pFillShapeElement.Symbol = pSimpleFillSym;

IGraphicsContainer pGC = axMapControl1.ActiveView.GraphicsContainer;
pGC.AddElement(pElement, 0);
axMapControl1.Refresh();

2. 实现根据起始点，以及限制在一个矩形中：Construct an elliptic arc that starts at fromPoint, goes to toPoint, and tries to have the embedded ellipse inscribed in the suggestedEnvelope. The result will have rotation of 0 or pi/2.

IPoint pPoint1 = new PointClass();
pPoint1.PutCoords(80, 20);
IPoint pPoint2 = new PointClass();
pPoint2.PutCoords(130, 50);
IPoint pPoint3 = new PointClass();
pPoint3.PutCoords(50, 20);
IPoint pPoint4 = new PointClass();
pPoint4.PutCoords(140, 60);
IEnvelope pEnvelope = new EnvelopeClass();
pEnvelope.LowerLeft = pPoint3;
pEnvelope.UpperRight = pPoint4;
IConstructEllipticArc pConstructEllipticArc = new EllipticArcClass();
pConstructEllipticArc.ConstructTwoPointsEnvelope(pPoint1, pPoint2, pEnvelope, esriArcOrientation.esriArcMajor);

ISegment pSegment = pConstructEllipticArc as ISegment;
ISegmentCollection pSegmentCollection = new RingClass();
object o = Type.Missing;
pSegmentCollection.AddSegment(pSegment, ref o, ref o);

IRing pRing = pSegmentCollection as IRing;

IGeometryCollection pGeometryColl = new PolygonClass();
pGeometryColl.AddGeometry(pRing, ref o, ref o);

ISimpleLineSymbol pSimpleLineSym = new SimpleLineSymbol();
pSimpleLineSym.Color = GetColor(0, 0, 0);
pSimpleLineSym.Width = 2;

ISimpleFillSymbol pSimpleFillSym = new SimpleFillSymbol();
IRgbColor pColor = new RgbColor();
pColor.Red = 255;
pColor.Transparency = 0;
pSimpleFillSym.Color = pColor;
pSimpleFillSym.Outline = pSimpleLineSym;

IElement pElement2 = new RectangleElementClass();
pElement2.Geometry = pEnvelope;

IFillShapeElement pFillShapeElement2 = pElement2 as IFillShapeElement;
pFillShapeElement2.Symbol = pSimpleFillSym;

IElement pElement = new EllipseElementClass();
pElement.Geometry = pGeometryColl as IGeometry;
IFillShapeElement pFillShapeElement = pElement as IFillShapeElement;
pColor.Transparency = 1;
pSimpleFillSym.Color = pColor;
pFillShapeElement.Symbol = pSimpleFillSym;

IGraphicsContainer pGC = axMapControl1.ActiveView.GraphicsContainer;
pGC.AddElement(pElement, 0);
pGC.AddElement(pElement2, 0);
axMapControl1.Refresh();

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●·● 绘制几何图形 —— 椭圆：

 

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●·● 绘制几何图形 —— 椭圆：