Using a graphics path to draw graphics objects in .NET framework

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Listing 1312 Using a graphics path to draw graphics objects
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Graphics g = thisCreateGraphics(); gClear(thisBackColor); // Create a black pen Pen blackPen = new Pen(ColorBlack, 2); // Create a graphics path GraphicsPath path = new GraphicsPath(); pathAddLine(50, 50, 200, 50); pathAddLine(50, 50, 50, 200); pathAddRectangle(new Rectangle(60, 60, 150, 150)); pathAddRectangle(new Rectangle(70, 70, 100, 100)); pathAddEllipse(90, 90, 50, 50); gDrawPath(blackPen, path); // Dispose of objects blackPenDispose(); gDispose(); Both Listings 1311 and 1312 generate the output shown inFigure 135 There is no straightforward rule for when to use graphics paths The choice depends on the complexity of your application
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Figure 135 The same result from two different drawing methods
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In the preceding example we saw how to replace multiple drawing statements with a single graphics path drawing statement But graphics paths have some limitations For example, we can't draw each element (line, rectangle, or an ellipse) of a graphics path with a separate pen or brush We have to draw or fill them individually
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1343 Select Methods Carefully
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Drawing lines and drawing rectangles are probably the most common operations If you are drawing more than one line or rectangle using the same colors, you should use the DrawLine/DrawLines and DrawRectangle/DrawRectangles methods, respectively For example, Listing 1313 draws three rectangles using the same brush
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Listing 1313 Using DrawRectangle to draw rectangles
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { Graphics g = eGraphics; // Create a black pen Pen blackPen = new Pen(ColorBlack, 2); // Create a rectangle float x = 50F, y = 50F; float width = 1000F; float height = 2000F; Rectangle rect = new Rectangle(20,20, 80, 40); // Draw rectangles gDrawRectangle(blackPen, x, y, width, height); gDrawRectangle(blackPen, 60, 80, 140, 50); gDrawRectangle(blackPen, rect); // Dispose of object blackPenDispose(); } Figure 136 shows the output from Listing 1313 Three rectangles have been drawn
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Figure 136 Using DrawRectangle to draw rectangles
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You can replace the code in Listing 1313 with Listing 1314, which uses DrawRectangles to draw the same number of rectangles Now we use an array of rectangles
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Listing 1314 Using DrawRectangles to draw rectangles
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { Graphics g = eGraphics; // Create a black pen Pen blackPen = new Pen(ColorBlack, 2); RectangleF[] rectArray = { new RectangleF( 50F, 50F, 1000F, 2000F), new RectangleF(200F, 200F, 800F, 400F), new RectangleF(600F, 800F, 1400F, 500F) }; gDrawRectangles(blackPen, rectArray); // Dispose of object blackPenDispose(); } If we run this code, the output looks exactly like Figure 136
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It is always good practice to write minimal code on events that are called frequently because that code will be executed whenever the event is called The Paint event is specifically designed for painting purposes and is called when redrawing is necessary It is always advisable to write your painting (or redrawing)-related code for this event only Writing code for other events, such as mouse-move or keyboard events, may cause serious problems or may not invalidate areas as necessary
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1345 Use System Brushes and Pens
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You can always create system pens and system brushes with system colors by using the SystemColors class, but for performance reasons it is advisable to use SystemPens and SystemBrushes instead of SystemColors For example, the following code createsSolidBrush and Pen objects using SystemColors The brush and pen have theActiveCaption and ControlDarkDark system colors, respectively
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SolidBrush brush = (SolidBrush)SystemBrushesFromSystemColor (SystemColorsActiveCaption); Pen pn = SystemPensFromSystemColor (SystemColorsControlDarkDark); We can create the same brush and pen by using the static methods of SystemBrushes and SystemPens, as the following code snippet illustrates:
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SolidBrush brush = (SolidBrush)SystemBrushesActiveCaption; Pen pn = SystemPensControlDarkDark; Never dispose of system pens and brushes Any attempt to do so will result in an unhandled exception For example, adding the following two lines to the code will throw an exception: