Figure 31 Using DrawLine to draw lines in .NET

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Figure 31 Using DrawLine to draw lines
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3212 Drawing Connected Lines
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Sometimes we need to draw multiple connected straight line segments One way to do this is to call the DrawLine method multiple times The Graphics class also provides the DrawLines method, which can be used to draw multiple connected lines This method has two overloaded forms One takes an array of Point structure objects, and the other takes an array ofPointF structure objects: 1 2 public void DrawLines(Pen, Point[]); public void DrawLines(Pen, PointF[]);
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To draw lines using DrawLines, an application first creates aPen object, then creates an array of points, and then calls DrawLines The code in Listing 32 draws three line segments
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Listing 32 Using DrawLines to draw connected lines
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PointF[] ptsArray = { new PointF( 200F, 200F), new PointF( 200F, 2000F), new PointF(2000F, 2000F), new PointF(200F, 200F) }; eGraphicsDrawLines(redPen, ptsArray); The code in Listing 32 draws what is shown in Figure 32
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Figure 32 Using DrawLines to draw connected lines
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3213 Drawing Rectangles
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The next basic drawing object is a rectangle When you draw a rectangle through your applications, you need to specify only the starting point, height, and width of the rectangle GDI+ takes care of the rest The Graphics class provides the DrawRectangle method, which draws a rectangle specified by a starting point, a width, and a height The Graphics class also provides the DrawRectangles method, which draws a series of rectangles specified by an array of Rectangle structures DrawRectangle has three overloaded methods An application can use aRectangle structure or coordinates of integer or float types to draw a rectangle: 1 2 3 public void DrawRectangle(Pen, Rectangle); public void DrawRectangle(Pen, int, int, int, int); public void DrawRectangle(Pen, float, float, float, float);
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To draw a rectangle, an application first creates a pen and a rectangle (location, width, and height), and then it calls DrawRectangle Listing 33 draws rectangles using the different overloaded forms ofDrawRectangle
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Listing 33 Using DrawRectangle to draw rectangles
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { // Create pens and points Pen redPen = new Pen(ColorRed, 1); Pen bluePen = new Pen(ColorBlue, 2); Pen greenPen = new Pen(ColorGreen, 3);
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float x = 50F, y = 50F; float width = 1000F; float height = 2000F; // Create a rectangle Rectangle rect = new Rectangle(20, 20, 80, 40); // Draw rectangles eGraphicsDrawRectangle(bluePen, x, y, width, height); eGraphicsDrawRectangle(redPen, 60, 80, 140, 50); eGraphicsDrawRectangle(greenPen, rect); // Dispose of objects redPenDispose(); bluePenDispose(); greenPenDispose(); } Figure 33 shows the output from Listing 33
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Figure 33 Drawing individual rectangles
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The DrawRectangles method draws a series of rectangles using a single-pen It is useful when you need to draw multiple rectangles using the same pen (if you need to draw multiple rectangles using different pens, you must use multiple calls to DrawRectangle) A single call to DrawRectangles is faster than multipleDrawRectangle calls DrawRectangles takes two parameters a pen and an array ofRectangle or RectangleF structures as shown in Listing 34
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Listing 34 Using DrawRectangles to draw a series of rectangles
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Pen greenPen = new Pen(ColorGreen, 4); RectangleF[] rectArray {
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new RectangleF( 50F, 50F, 1000F, 2000F), new RectangleF(200F, 200F, 800F, 400F), new RectangleF(600F, 800F, 1400F, 500F) }; eGraphicsDrawRectangles(greenPen, rectArray); greenPenDispose() Figure 34 shows the output from Listing 34 As you can see, it's easy to draw multiple rectangles using the DrawRectangles method
Figure 34 Drawing a series of rectangles
3214 Drawing Ellipses and Circles
An ellipse is a circular boundary within a rectangle, where each opposite point has the same distance from a fixed point, called the center of the ellipse An ellipse within a square is called a circle Figure 35 shows an ellipse with its height, width, and center indicated