Using alpha blending to draw non-opaque or semi-opaque graphics shapes in Visual Studio .NET

Generating USS Code 128 in Visual Studio .NET Using alpha blending to draw non-opaque or semi-opaque graphics shapes
Listing 931 Using alpha blending to draw non-opaque or semi-opaque graphics shapes
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private void AlphaBPensBrushes_Click(object sender, SystemEventArgs e) { Graphics g = thisCreateGraphics(); gClear(thisBackColor); // Create pens with semitransparent colors Rectangle rect = new Rectangle(220, 30, 100, 50); Pen transPen = new Pen(ColorFromArgb(128, 255, 255, 255), 10); Pen totTransPen = new Pen(ColorFromArgb(40, 0, 255, 0), 10); // Draw line, rectangle, ellipse, and string using // semitransparent colored pens gDrawLine(transPen, 10, 30, 200, 30); gDrawLine(totTransPen, 10, 50, 200, 50); gFillRectangle(new SolidBrush( ColorFromArgb(40, 0, 0, 255)), rect); rectY += 60; gFillEllipse(new SolidBrush( ColorFromArgb(20, 255, 255, 0)), rect); SolidBrush semiTransBrush = new SolidBrush(ColorFromArgb(90, 0, 50, 255)); gDrawString("Some Photo \nDate: 04/09/2001", new Font("Verdana", 14), semiTransBrush, new RectangleF(20, 100, 300, 100) ); // Dispose of object gDispose(); } Figure 942 shows the output from Listing 931 The lines, rectangle, ellipse, and text on this form are semitransparent
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Figure 942 Drawing semitransparent graphics shapes
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962 Alpha Blending and Images
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We often see a semitransparent date and place name on a photo You can draw transparent graphics shapes on images using the same method: Create a graphics shape using semi- or non-opaque colors, and then draw on the image Listing 932 draws graphics shapes on an image First we create anImage object and call DrawImage to draw an image Then we create transparent pens and brushes and call fill and draw methods to draw graphics shapes You can add the code in Listing 932 to any menu item or button click event handler
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Listing 932 Drawing semitransparent graphics shapes on an image
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private void AlphaBImages_Click(object sender, SystemEventArgs e) { Graphics g = thisCreateGraphics(); gClear(thisBackColor); // Draw an image Image curImage = ImageFromFile("Neel3jpg"); gDrawImage(curImage, 0, 0, curImageWidth, curImageHeight); // Create pens and a rectangle Rectangle rect = new Rectangle(220, 30, 100, 50); Pen opqPen = new Pen(ColorFromArgb(255, 0, 255, 0), 10); Pen transPen = new Pen(ColorFromArgb(128, 255, 255, 255), 10); Pen totTransPen = new Pen(ColorFromArgb(40, 0, 255, 0), 10); // Draw lines, rectangle, ellipse, and string gDrawLine(opqPen, 10, 10, 200, 10); gDrawLine(transPen, 10, 30, 200, 30); gDrawLine(totTransPen, 10, 50, 200, 50); gFillRectangle(new SolidBrush( ColorFromArgb(140, 0, 0, 255)), rect); rectY += 60; gFillEllipse(new SolidBrush( ColorFromArgb(150, 255, 255, 255)), rect); SolidBrush semiTransBrush = new SolidBrush(ColorFromArgb(90, 255, 255, 50)); gDrawString("Some Photo \nDate: 04/09/2001", new Font("Verdana", 14), semiTransBrush, new RectangleF(20, 100, 300, 100) ); // Dispose of object gDispose(); } Figure 943 shows the output from Listing 932 Lines, text, a rectangle, and an ellipse are drawn on top of the image, but you can see through them because these shapes are semitransparent
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Figure 943 Drawing semitransparent shapes on an image
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963 Compositing Mode and Blending
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As mentioned earlier, blending is a process of combining two colors: a source color and a background color The compositing mode specifies how source colors are combined with background colors The CompositingMode property of the Graphics class represents the compositing mode of a graphics surface, which applies to all graphics shapes for that surface The CompositingMode enumeration has two members:SourceCopy and SourceOver SourceCopy specifies that when a color is rendered, it overwrites the background color, and SourceOver specifies that when a color is rendered, it is blended with the background color using the alpha component The following code snippet shows how to set the CompositingMode property of a Graphics object
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Graphics g = thisCreateGraphics(); gClear(thisBackColor); gCompositingMode = CompositingModeSourceCopy; gCompositingMode = CompositingModeSourceOver; // Dispose of object gDispose();
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CompositingMode may be helpful in scenarios where you need to draw overlapped images Suppose you draw one rectangle and one ellipse, and an area of the ellipse overlaps a small area of the rectangle You may or may not want to show the overlapped area of the rectangle The compositing mode provides you the option of doing either Instead of applying CompositingMode to all of the graphics, you can apply it to selected shapes One way to do this is to create a temporary Graphics object (a new surface), draw all the shapes you need and apply the compositing mode on this object You can also create graphics containers and apply the necessary settings to each graphics container The quality of compositing is inversely proportional to the rendering speed: The higher the quality, the slower the rendering The CompositingQuality property of the Graphics object represents the quality of a composition process, which takes a value of type CompositingQuality enumeration The CompositingQuality enumeration is defined in Table 912 Listing 933 draws two sets of shapes Each set has a rectangle and an ellipse First we create a Bitmap object, and then we create a temporary Graphics object using the FromImage method by passing the Bitmap object We set the CompositingMode property of this Graphics object to SourceOver, which means that the color rendered overwrites the background color Then we draw a rectangle and an ellipse
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