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Listing 725 The TrackBar scroll event handler
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private void trackBar1_Scroll(object sender, SystemEventArgs e) { tpVal = (float)trackBar1Value/10; thisInvalidate(); } We will now view both images on the form's paint event, as Listing 726 shows We create an Image object and view the first image Then we create a ColorMatrix object with transparency and set it with theImageAttribute property Later we attach theImageAttribute property to the second image when we draw it using the DrawImage method
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Listing 726 Viewing multiple images on the form-load event
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { // Create an Image object (first image) from a file curImage = ImageFromFile("rosesjpg"); // Draw first image eGraphicsDrawImage(curImage, AutoScrollPositionX, AutoScrollPositionY, curImageWidth, curImageHeight ); // Create an array of ColorMatrix points float[][] ptsArray = { new float[] {1, 0, 0, 0, 0}, new float[] {0, 1, 0, 0, 0}, new float[] {0, 0, 1, 0, 0}, new float[] {0, 0, 0, tpVal, 0}, new float[] {0, 0, 0, 0, 1}
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks }; // Create a ColorMatrix object ColorMatrix clrMatrix = new ColorMatrix(ptsArray); // Create image attributes ImageAttributes imgAttributes = new ImageAttributes(); // Set color matrix imgAttributesSetColorMatrix(clrMatrix, ColorMatrixFlagDefault, ColorAdjustTypeBitmap); // Create second Image object from a file Image smallImage = ImageFromFile("smallRosesgif"); // Draw second image with image attributes eGraphicsDrawImage(smallImage, new Rectangle(100, 100, 100, 100), 0, 0, smallImageWidth, smallImageHeight, GraphicsUnitPixel, imgAttributes ); }
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710 Using a Picture Box to View Images
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So far in our sample applications, we have used a form as the drawing surface for images You can also use a PictureBox control to view images Picture boxes are easy to use, and this control optimizes the rendering process with a built-in double buffering feature A picture box is recommended for viewing (but not manipulating) images when you know the exact size of the image The PictureBox class is defined in the SystemWindowsForms namespace The Image property, which takes anImage object, sets the image to the picture box that you want to display You can also set the position and clipping, using the SizeMode property SizeMode, which is of type PictureBoxSizeMode enumeration, specifies how an image is positioned within a picture box The members of the PictureBoxSizeMode enumeration are defined in Table 76 To view an image in a PictureBox control, we simply create an Image object using any of the Image class methods and set the PictureBoxImage property to that image Listing 727 views an image in a picture box To test this code, create a Windows application, add PictureBox control to the form by dragging it a from the toolbox, and add code to the form-load event handler
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Listing 727 Viewing an image in a picture box
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Image curImage = ImageFromFile("rosesjpg"); pictureBox1Image = curImage; pictureBox1SizeMode = PictureBoxSizeModeStretchImage; Figure 741 shows the output from Listing 727
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Figure 741 Viewing an image in a picture box
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Table 76 PictureBoxSizeMode members
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Member AutoSize CenterImage Normal StretchImage Description The picture box is automatically set to the same size as the image The image is displayed in the center of the picture box The image is placed in the upper left corner of the picture box and clipped if it is larger than the control The image is stretched or shrunk to fit the size of the picture box
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711 Saving Images with Different Sizes
Sometimes we need to save an image with a different size than it originally had As we discussed earlier, the Save method of the Image class is used to save images This method also allows us to specify the size of a saved image To make our program even more interesting, we will determine the size of the saved image at runtime Create a Windows application and add two text boxes, two tables, and a button control to the form The text boxes are used to specify the height and width of the saved image, and the button is used to save the image with the new size, as shown in Figure 742