qr code generator vb net open source C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES in Visual Basic .NET

Maker QR Code 2d barcode in Visual Basic .NET C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES

C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES
Denso QR Bar Code Creator In Visual Basic .NET
Using Barcode generation for VS .NET Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications.
www.OnBarcode.com
Recognize QR Code 2d Barcode In Visual Basic .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Figure 11-8. The full-size ball image
Painting Barcode In VB.NET
Using Barcode generation for .NET framework Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Create Matrix 2D Barcode In VB.NET
Using Barcode creation for VS .NET Control to generate, create 2D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Drawing Scaled Images
Print Linear 1D Barcode In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create Linear 1D Barcode image in .NET framework applications.
www.OnBarcode.com
QR-Code Drawer In VB.NET
Using Barcode generation for .NET Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
www.OnBarcode.com
The Bitmap class also provides a StretchImage method that allows one bitmap to draw all of another bitmap on itself by scaling the image to fit into a specified destination rectangle. You cannot draw a part of the source image; this drawing method will always render the entire source image but in a new size. The code in Listing 11-7 will render the entire ball image and perform a horizontal shrink and vertical stretch operation to fit the image into a destination rectangle that has half the width and double the height of the source image size (see Figure 11-9). Listing 11-7. Image Scaling ScreenMetrics metrics = ScreenMetrics.GetMetrics(); Bitmap bmp = new Bitmap(metrics.Width, metrics.Height); Bitmap soccerBall = Resources.GetBitmap(Resources.BitmapResources.SoccerBall); bmp.StretchImage(100, 50, // destination coordinates soccerBall, // source image soccerBall.Width / 2, // half width soccerBall.Height * 2, // double height Bitmap.OpacityOpaque); // opacity bmp.Flush();
Universal Product Code Version A Generator In VB.NET
Using Barcode printer for .NET framework Control to generate, create UCC - 12 image in Visual Studio .NET applications.
www.OnBarcode.com
Encode ITF In Visual Basic .NET
Using Barcode creator for .NET Control to generate, create USS ITF 2/5 image in .NET applications.
www.OnBarcode.com
Figure 11-9. Scaling the ball image to half its width and double its height
Making QR In None
Using Barcode creator for Office Word Control to generate, create QR-Code image in Word applications.
www.OnBarcode.com
Quick Response Code Generator In Visual Basic .NET
Using Barcode encoder for .NET Control to generate, create Quick Response Code image in Visual Studio .NET applications.
www.OnBarcode.com
CHAPTER 11 GRA PHICS AN D G RAPHIC AL US ER INTERFA CES
ANSI/AIM Code 39 Generator In Java
Using Barcode maker for Java Control to generate, create USS Code 39 image in Java applications.
www.OnBarcode.com
EAN / UCC - 14 Generator In .NET
Using Barcode encoder for Reporting Service Control to generate, create UCC - 12 image in Reporting Service applications.
www.OnBarcode.com
Drawing Images with Transparent Backgrounds
Make PDF-417 2d Barcode In None
Using Barcode printer for Excel Control to generate, create PDF 417 image in Excel applications.
www.OnBarcode.com
EAN 13 Decoder In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
With the opacity parameter, you select whether an entire bitmap will be rendered transparent, opaque, or something between. In contrast, the MakeTransparent method enables you to select a transparent color to draw, for example, the ball image with a transparent background. The MakeTransparent method accepts a color value. When rendering such a bitmap, each pixel of that color will not cover the underlaying pixels of the destination image that it s drawing on. For the ball image, we will obtain the color of the top-left corner pixel and choose it as the transparent color (see Listing 11-8). Listing 11-8. Selecting a Transparent Color ScreenMetrics metrics = ScreenMetrics.GetMetrics(); Bitmap bmp = new Bitmap(metrics.Width, metrics.Height); Bitmap soccerBall = Resources.GetBitmap(Resources.BitmapResources.SoccerBall); //make background of the ball transparent //using the color of top left corner pixel soccerBall.MakeTransparent(soccerBall.GetPixel(0, 0)); bmp.DrawImage(100, 50, // destination coordinates soccerBall, // source image 0, 0, // source coordinates soccerBall.Width, // source width soccerBall.Height, // source height Bitmap.OpacityOpaque); // opacity bmp.Flush(); The .NET Micro Framework does not support modifying images of the Bitmap type after you create them. If you embed an image resource in your application from a bitmap file, calling the MakeTransparent method for such an image will cause an error. With JPEG images, you will not get an exception, but the image will not be rendered transparently. With GIF images, the system behaves as expected. Therefore, if using a bitmap or JPEG resource, you need to create a copy of the image and then make it transparent (see Listing 11-9). The best option is to use GIF images and then make them transparent by selecting one transparent color. Listing 11-9. Using a Transparent Background with Bitmap or JPEG Files Bitmap soccerBall = Resources.GetBitmap(Resources.BitmapResources.SoccerBall); // create a copy Bitmap soccerBallTransparent = new Bitmap(soccerBall.Width, soccerBall.Height); soccerBallTransparent.DrawImage(0, 0, // destination coordinates soccerBall, // source image 0, 0, // source coordinates soccerBall.Width, // source width soccerBall.Height, // source height Bitmap.OpacityOpaque); // opacity //make background of the ball transparent //using the color of top left corner pixel soccerBallTransparent.MakeTransparent(soccerBallTransparent.GetPixel(0, 0));
1D Barcode Drawer In VS .NET
Using Barcode creator for .NET framework Control to generate, create 1D image in .NET applications.
www.OnBarcode.com
Making UPC - 13 In None
Using Barcode encoder for Excel Control to generate, create GTIN - 13 image in Office Excel applications.
www.OnBarcode.com
C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES
ECC200 Generator In Visual Studio .NET
Using Barcode printer for Reporting Service Control to generate, create Data Matrix 2d barcode image in Reporting Service applications.
www.OnBarcode.com
Make QR Code 2d Barcode In Objective-C
Using Barcode encoder for iPhone Control to generate, create QR Code JIS X 0510 image in iPhone applications.
www.OnBarcode.com
Listing 11-10 demonstrates how to program a moving ball that bounces back when it reaches the screen borders. The ball is rendered with a transparent background onto a color gradient background, as shown in Figure 11-10. In this example, the moving sprite is drawn flicker free using double buffering. That means each frame is prepared completely in a memory image buffer before flushing it to the display. Before flushing, the code first loads the embedded sprite bitmap from the resources and initializes the background and the buffer bitmap that holds the current screen. In an endless loop, the application moves the sprite. The current screen position of the sprite (defined by the top-left corner of the sprite) is stored in the x and y variables. The variables xOfs and yOfs describe the moving direction and speed of the sprite. Every time the ball hits a border, both directions are inverted. The application changes the horizontal and vertical position with an equal absolute value, which causes the ball to move and bounce at a 45-degree angle.
Generate Code-39 In None
Using Barcode creation for Office Word Control to generate, create Code-39 image in Office Word applications.
www.OnBarcode.com
Barcode Printer In Visual Studio .NET
Using Barcode creation for Visual Studio .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Figure 11-10. A moving ball on a color gradient background Listing 11-10. Programming Sprites using using using using using System; System.Threading; Microsoft.SPOT; Microsoft.SPOT.Hardware; Microsoft.SPOT.Presentation.Media;
namespace BouncingBallSample { public class Program { public static void Main() { ScreenMetrics metrics = ScreenMetrics.GetMetrics(); //prepare background with a color gradient Bitmap backgroundImg = new Bitmap(metrics.Width, metrics.Height); backgroundImg.DrawRectangle( Color.White, // outline color 0, // outline thickness 0, 0, // x and y of top left corner backgroundImg.Width, // width
Copyright © OnBarcode.com . All rights reserved.