Transformation in texture brushes in VS .NET

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Listing 423 Transformation in texture brushes
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private void TextureBrush_Click(object sender, SystemEventArgs e) { Graphics g = thisCreateGraphics(); gClear(thisBackColor); // Create a TextureBrush object TextureBrush txtrBrush = new TextureBrush( new Bitmap("smallRosesgif")); // Create a transformation matrix Matrix M = new Matrix(); // Rotate the texture image by 90 degrees txtrBrushRotateTransform(90, MatrixOrderPrepend); // Translate MTranslate(50, 0);
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// Multiply the transformation matrix // of txtrBrush by translateMatrix txtrBrushMultiplyTransform(M); // Scale operation txtrBrushScaleTransform(2, 1, MatrixOrderPrepend); // Fill a rectangle with texture brush gFillRectangle(txtrBrush, 240, 0, 200, 200); // Reset transformation txtrBrushResetTransform(); // Fill rectangle after resetting transformation gFillRectangle(txtrBrush, 0, 0, 200, 200); // Dispose of objects txtrBrushDispose(); gDispose(); } Figure 428 shows the output from Listing 423, with the original image on the left and the transformed image on the right
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Figure 428 Transformation in TextureBrush
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A transformation on a linear gradient brush is a transformation of the colors of the brush The LinearGradientBrush class provides all common transformation methods and Transform properties Listing 424 shows how to use transformation in linear gradient brushes
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Listing 424 Transformation in linear gradient brushes
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private void LinearGradientBrush_Click(object sender, SystemEventArgs e) { Graphics g = thisCreateGraphics(); gClear(thisBackColor); // Create a LinearGradientBrush object Rectangle rect = new Rectangle(20, 20, 200, 100); LinearGradientBrush lgBrush = new LinearGradientBrush( rect, ColorRed, ColorGreen, 00f, true); Point[] ptsArray = {new Point(20, 50), new Point(200,50), new Point(20, 100)}; Matrix M = new Matrix(rect, ptsArray); // Multiply transformation lgBrushMultiplyTransform(M, MatrixOrderPrepend); // Rotate transformation lgBrushRotateTransform(450f, MatrixOrderPrepend); // Scale transformation lgBrushScaleTransform(2, 1, MatrixOrderPrepend); // Draw a rectangle after transformation gFillRectangle(lgBrush, 0, 0, 200, 100); // Reset transformation lgBrushResetTransform(); // Draw a rectangle after reset transformation gFillRectangle(lgBrush, 220, 0, 200, 100); // Dispose of objects lgBrushDispose(); gDispose(); } Figure 429 shows the output from Listing 424 The second rectangle results from various transformation operations, and the first rectangle is a result of a call to ResetTransform
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Figure 429 Transformation in linear gradient brushes
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PathGradientBrush provides similar mechanisms to transform path gradient brushes AsListing 425 shows, we create a PathGradientBrush object and set its CenterColor and SurroundColors properties Then we create aMatrix object and call its methods to apply various
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transformation operations, such as translation, rotation, scaling, and shearing, and we apply the Matrix object to the PathGradientBrush object by calling its MultiplyTransform method
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Listing 425 Transformation in path gradient brushes
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private void PathGradientBrush_Click(object sender, SystemEventArgs e) { Graphics g = thisCreateGraphics(); gClear(thisBackColor); // Create a GraphicsPath object GraphicsPath path = new GraphicsPath(); // Create a rectangle and add it to path Rectangle rect = new Rectangle(20, 20, 200, 200); pathAddRectangle(rect); // Create a path gradient brush PathGradientBrush pgBrush = new PathGradientBrush(pathPathPoints); // Set its center and surrounding colors pgBrushCenterColor = ColorGreen; pgBrushSurroundColors = new Color[] {ColorBlue}; // Create matrix Matrix M = new Matrix(); // Translate MTranslate(200f, 100f, MatrixOrderPrepend); // Rotate MRotate(100f, MatrixOrderPrepend); // Scale MScale(2, 1, MatrixOrderPrepend); // Shear MShear(05f, 003f, MatrixOrderPrepend); // Apply matrix to the brush pgBrushMultiplyTransform(M); // Use brush after transformation // to fill a rectangle gFillRectangle(pgBrush, 20, 100, 400, 400); // Dispose of objects pgBrushDispose(); gDispose(); } Figure 430 shows the output from Listing 425 The original rectangle started at point (10, 10) with height and width 200 each, but after various transformation methods have been applied, the output rectangle is totally different
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Figure 430 Transformation in path gradient brushes
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45 System Pens and System Brushes
System pens and system brushes are pens and brushes that are used to create system colors In this section we will discuss how to create and use system pens and brushes There are two ways to create system pens and brushes First, you can create pens and brushes using the SystemColors class SystemColors represents the system colors in GDI+, providing static properties for system colors, such as ActiveBorder and ControlText The second way to create system pens and brushes uses the SystemPens and SystemBrushes classes For performance reasons, it is a good idea to use the SystemPens and SystemBrushes classes rather than creating pens and brushes by using the SystemColors class