【039】Geometry 總結

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●·● 目錄：

A1 ………… Geometry 總結
A2 ………… 繪制幾何圖形 —— 圓
A3 ………… 繪制幾何圖形 —— 橢圓
A4 ………… 繪制幾何圖形 —— 圓弧
A5 ………… 繪制幾何圖形 —— 橢圓弧
A6 ………… VS2008打開VS2010項目
A7 ………… Visual Studio 2008“分析 EntityName 時出錯。 行 2，位置 81。”報錯解決！
A8 ………… 類、接口等的引用傳遞的理解
A9 ………… DrawShape 與 AddElement 顯示圖形的區別

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●·● Geometry 總結：

1. Polyline：是 Path 的集合，可以實現 IGeometryCollection 接口，用於添加幾何圖形！
2. Path：由 Segment 組成，可以實現 ISegmentCollection 接口，用於添加 Segment！
3. Polygon：是 Ring 的集合，可以實現 IGeometryCollection 接口，用於添加幾何圖形！
4. Ring：由 Segment 組成，可以實現 ISegmentCollection 接口，用於添加 Segment！
5. Segment：包括 Line、CircularArc、EllipticArc、BezierCurve 四個！

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●·● 繪制幾何圖形 —— 圓：

1. 構造圓心點，IPoint。
2. 構造圓弧，IConstructCircularArc，通過此接口，利用圓心和半徑來確定圓弧。
3. 構造線段，ISegment，將圓弧轉為線段接口，用於添加到下面的線段集合中。
4. 構造線段集合，ISegmentCollection，將上面的線段添加進來。
5. 構造環，IRing，將線段集合轉為環接口，用於實現圖形的 Close 。
6. 構造幾何圖形集合：IGeometryCollection，將上面的環添加到幾何圖形集合中，然后就可以用了。

有填充顏色的：

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

//構建圓對象
IConstructCircularArc pConstructCircularArc = new CircularArcClass();
pConstructCircularArc.ConstructCircle(pPoint, 20, false);
ICircularArc pArc = pConstructCircularArc as ICircularArc;　　//不必要
ISegment pSegment1 = pArc as ISegment;

//通過ISegmentCollection構建Ring對象
ISegmentCollection pSegCollection = new RingClass();
object o = Type.Missing;

//添加Segement對象即圓
pSegCollection.AddSegment(pSegment1, ref o, ref o);

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

//通過Ring對象使用IGeometryCollection構建Polygon對象
IGeometryCollection pGeometryColl = new PolygonClass();
pGeometryColl.AddGeometry(pRing, ref o, ref o);

//構建一個CircleElement對象
IElement pElement = new CircleElementClass();

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

沒有填充顏色的，只需加入下面一句，使其為透明顏色即可！

pColor.Transparency = 0;

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●·● 繪制幾何圖形 —— 橢圓：

1. 構造兩個點，IPoint。
2. 構造包絡線也就是矩形，IEnvelope，通過上面的兩個點。
3. 構造圓弧，IConstructEllipticArc，通過此接口，利用矩形來確定橢圓弧。
4. 構造線段，ISegment，將橢圓弧轉為線段接口，用於添加到下面的線段集合中。
5. 構造線段集合，ISegmentCollection，將上面的線段添加進來。
6. 構造環，IRing，將線段集合轉為環接口，用於實現圖形的 Close 。
7. 構造幾何圖形集合：IGeometryCollection，將上面的環添加到幾何圖形集合中，然后就可以用了。

有填充顏色的：

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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●·● 繪制幾何圖形 —— 圓弧：

1. 構造圓心點，IPoint。
2. 構造圓弧，IConstructCircularArc，通過此接口，利用圓心、半徑、起始角度，中心角來確定圓弧。
3. 構造線段，ISegment，將圓弧轉為線段接口，用於添加到下面的線段集合中。
4. 構造線段集合，ISegmentCollection，將上面的線段添加進來。
5. 構造環或者路徑，IRing or IPath，將線段集合轉為環接口或是路徑接口 。
6. 構造幾何圖形集合：IGeometryCollection，將上面的環添加到幾何圖形集合中，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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●·● 繪制幾何圖形 —— 橢圓弧：

1. 實現畫¼圓弧：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);　　//第三個參數決定順逆時針！
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. 實現根據起始點，以及限制在一個矩形中：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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●·● 繪制幾何圖形 —— 橢圓：

 

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●·● 繪制幾何圖形 —— 橢圓：