Creating a simple graphics path in VS .NET

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Listing 99 Creating a simple graphics path
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private void Sample_Click(object sender, SystemEventArgs e) { Graphics g = thisCreateGraphics(); gClear(thisBackColor); // Create a graphics path GraphicsPath path = new GraphicsPath(); // Add two lines, a rectangle, and // an ellipse pathAddLine(20, 20, 200, 20); pathAddLine(20, 20, 20, 200); pathAddRectangle(new Rectangle(30, 30, 100, 100)); pathAddEllipse(new Rectangle(50, 50, 60, 60)); // Draw path Pen redPen = new Pen(ColorRed, 2); gDrawPath(redPen, path); // Dispose of objects redPenDispose(); gDispose(); }
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Table 96 PathPointType members
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Member Bezier Bezier3 CloseSubpath DashMode Line PathMarker PathTypeMask Start Default B zier curve Cubic B zier curve There is no practical difference between Bezier and Bezier3 Ending point of a subpath Dashed segment Line segment Path marker, which allows easy traversal of a path by marking the points Mask point, which allows us to show or hide points Starting point of a graphics path Description
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Figure 916 shows the output from Listing 99: two lines, a rectangle, and an ellipse
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Figure 916 A simple graphics path
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You can also fill a path with FillPath If you replace theDrawPath line in Listing 99 with:
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gFillPath(new SolidBrush(ColorBlack), path); the code will generate a new figure that looks like Figure 917
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Figure 917 A filled graphics path
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Note
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In a graphics path, all lines and curves are connected, even though you don't connect them explicitly Objects like rectangles and circles may not be connected (unless you connect them explicitly) but they are still part of the path
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922 Shaped Forms and Graphics Paths
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Graphics paths are very useful when you need to create shaped (nonrectangular) forms and controls Using a graphics path, you can also write a form with a text-based shape For example, you can write a form application that looks like Figure 918, which includes a text string, two ellipses, and two rectangles
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Figure 918 A shaped form
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Writing applications with shaped forms is easy if we use graphics paths First we create a GraphicsPath object and add components (such as rectangles, ellipses, or text) to the path Then we create a Region object from the graphics path and set it as the form's Region property For example, Listing 910 adds text, two rectangles, and two ellipses to a graphics path, creates a Region object from this graphics path, and sets it as the Region property of the form The output of this code will generate a form that looks like Figure 918
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Listing 910 Using graphics paths to create shaped forms
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GraphicsPath path = new GraphicsPath(FillModeAlternate); pathAddString("Close Right Click!", new FontFamily("Verdana"), (int)FontStyleBold, 50, new Point(0, 0), StringFormatGenericDefault ); pathAddRectangle(new Rectangle(20, 70, 100, 100)); pathAddEllipse(new Rectangle(140, 70, 100, 100)); pathAddEllipse(new Rectangle(260, 70, 100, 100)); pathAddRectangle(new Rectangle(380, 70, 100, 100)); Region rgn = new Region(path); thisRegion = rgn; To test this code, create a Windows application and add this code to the form's load event handler
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GraphicsPath
Properties and Methods
Let's examine the properties and methods of the GraphicsPath class before we start using themTable 97 describes the properties The following code snippet reads some of the GraphicsPath properties:
// Getting GraphicsPath properties FillMode fMode = pathFillMode; PathData data = pathPathData; PointF [] pts = pathPathPoints; byte [] ptsTypes = pathPathTypes; int count = pathPointCount; The GraphicsPath class provides more than a dozen add methods to add graphics objects to a path Among these methods are AddArc, AddBezier, AddBeziers, AddCloseCurve, AddCurve, AddEllipse, AddLine, AddLines, AddPath, AddPie, AddPolygon, AddRectangle, AddRectangles, and AddString These methods are used to add an arc, a B zier, a set of B ziers, a closed curve, a curve, an ellipse, a line, a set of lines, a path, a pie, a polygon, a rectangle, a set of rectangles, and a string, respectively Other methods, which don't belong to the add category, are described in Table 98