qr code generator vb net open source Figure 11-2. Flushing part of a bitmap in VB.NET

Create QR Code in VB.NET Figure 11-2. Flushing part of a bitmap

Figure 11-2. Flushing part of a bitmap
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CHAPTER 11 GRA PHICS AN D G RAPHIC AL US ER INTERFA CES
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It is also possible to flush from a different source bitmap to your screen.
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Caution In order to flush bitmaps onto your display, you need to create the source bitmap with exactly
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the same dimensions as your display, even if you will flush only a part to your display.
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Using Colors
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In the previous example, you saw how to draw a white line. Colors are represented in the .NET Micro Framework with the Microsoft.SPOT.Presentation.Media.Color enumerated type in the Microsoft.SPOT.Graphics.dll library. This enumeration has only the members Black and White. But you can create your own color from red, green, and blue (RGB) intensity values with the Microsoft.SPOT.Presentation.Media.ColorUtility class. This class has a static ColorFromRGB method to create a custom color from the specified RGB intensity components. Table 11-1 lists the known colors from the full .NET Framework and their RGB intensities. You can use the RGB values from that table with the ColorUtility.ColorFromRGB method. For example, to create a yellow color, you need to use the following code: Color yellowColor = ColorUtility.ColorFromRGB(0xFF, 0xFF, 0x00); Yellow is a mix of red and green. The red, green, and blue intensities are accepted as byte values ranging from 0 to 255 (0xFF in hexadecimal). A color value is actually a 32-bit integer that uses 24 bits to store the RGB value. It is possible to cast an integer directly into a color value: Color pinkColor = (Color)0xCBC0FF; // BBGGRR (R=0xFF, G=0xC0, B=0xCB) The ColorUtility class has three helper methods GetRValue, GetGValue, and GetBValue to split a color into its red, green, and blue components. The ScreenMetrics class provides the BitsPerPixel property to determine the supported color depth of your hardware configuration. To set the color for an individual pixel, you can use the SetPixel method of the Bitmap class. The method accepts the x and y coordinates as well as the new color value. The method GetPixel will return the color value from a particular pixel on the bitmap.
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Table 11-1. Known Colors and Their RGB Values
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Name
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AliceBlue AntiqueWhite Aqua Aquamarine Azure Beige Bisque
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0xF0 0xFA 0x00 0x7F 0xF0 0xF5 0xFF
Green
0xF8 0xEB 0xFF 0xFF 0xFF 0xF5 0xE4
Blue
0xFF 0xD7 0xFF 0xD4 0xFF 0xDC 0xC4
C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES
Table 11-1. Known Colors and Their RGB Values (Continued)
Name
Black BlanchedAlmond Blue BlueViolet Brown BurlyWood CadetBlue Chartreuse Chocolate Coral CornflowerBlue Cornsilk Crimson Cyan DarkBlue DarkCyan DarkGoldenrod DarkGray DarkGreen DarkKhaki DarkMagenta DarkOliveGreen DarkOrange DarkOrchid DarkRed DarkSalmon DarkSeaGreen DarkSlateBlue DarkSlateGray DarkTurquoise DarkViolet DeepPink
0x00 0xFF 0x00 0x8A 0xA5 0xDE 0x5F 0x7F 0xD2 0xFF 0x64 0xFF 0xDC 0x00 0x00 0x00 0xB8 0xA9 0x00 0xBD 0x8B 0x55 0xFF 0x99 0x8B 0xE9 0x8F 0x48 0x2F 0x00 0x94 0xFF
Green
0x00 0xEB 0x00 0x2B 0x2A 0xB8 0x9E 0xFF 0x69 0x7F 0x95 0xF8 0x14 0xFF 0x00 0x8B 0x86 0xA9 0x64 0xB7 0x00 0x6B 0x8C 0x32 0x00 0x96 0xBC 0x3D 0x4F 0xCE 0x00 0x14
Blue
0x00 0xCD 0xFF 0xE2 0x2A 0x87 0xA0 0x00 0x1E 0x50 0xED 0xDC 0x3C 0xFF 0x8B 0x8B 0x0B 0xA9 0x00 0x6B 0x8B 0x2F 0x00 0xCC 0x00 0x7A 0x8B 0x8B 0x4F 0xD1 0xD3 0x93
CHAPTER 11 GRA PHICS AN D G RAPHIC AL US ER INTERFA CES
Table 11-1. Known Colors and Their RGB Values (Continued)
Name
DeepSkyBlue DimGray DodgerBlue Firebrick FloralWhite ForestGreen Fuchsia Gainsboro GhostWhite Gold Goldenrod Gray Green GreenYellow Honeydew HotPink IndianRed Indigo Ivory Khaki Lavender LavenderBlush LawnGreen LemonChiffon LightBlue LightCoral LightCyan LightGoldenrodYellow LightGreen LightGray LightPink LightSalmon
0x00 0x69 0x1E 0xB2 0xFF 0x22 0xFF 0xDC 0xF8 0xFF 0xDA 0x80 0x00 0xAD 0xF0 0xFF 0xCD 0x4B 0xFF 0xF0 0xE6 0xFF 0x7C 0xFF 0xAD 0xF0 0xE0 0xFA 0x90 0xD3 0xFF 0xFF
Green
0xBF 0x69 0x90 0x22 0xFA 0x8B 0x00 0xDC 0xF8 0xD7 0xA5 0x80 0x80 0xFF 0xFF 0x69 0x5C 0x00 0xFF 0xE6 0xE6 0xF0 0xFC 0xFA 0xD8 0x80 0xFF 0xFA 0xEE 0xD3 0xB6 0xA0
Blue
0xFF 0x69 0xFF 0x22 0xF0 0x22 0xFF 0xDC 0xFF 0x00 0x20 0x80 0x00 0x2F 0xF0 0xB4 0x5C 0x82 0xF0 0x8C 0xFA 0xF5 0x00 0xCD 0xE6 0x80 0xFF 0xD2 0x90 0xD3 0xC1 0x7A
C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES
Table 11-1. Known Colors and Their RGB Values (Continued)
Name
LightSeaGreen LightSkyBlue LightSlateGray LightSteelBlue LightYellow Lime LimeGreen Linen Magenta Maroon MediumAquamarine MediumBlue MediumOrchid MediumPurple MediumSeaGreen MediumSlateBlue MediumSpringGreen MediumTurquoise MediumVioletRed MidnightBlue MintCream MistyRose Moccasin NavajoWhite Navy OldLace Olive OliveDrab Orange OrangeRed Orchid PaleGoldenrod
0x20 0x87 0x77 0xB0 0xFF 0x00 0x32 0xFA 0xFF 0x80 0x66 0x00 0xBA 0x93 0x3C 0x7B 0x00 0x48 0xC7 0x19 0xF5 0xFF 0xFF 0xFF 0x00 0xFD 0x80 0x6B 0xFF 0xFF 0xDA 0xEE
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