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Derived from GameObjectBase is the SpriteObject class (see Figure 3 1). This is a concrete class (not abstract) in which we will add all the basic functionality that we might want to use to position and draw our sprites. In its basic form, the class is capable of maintaining a sprite s position, scaling, rotation, and origin, a texture for it to render with, a color to tint with, a source rectangle for partial texture

Figure 3-2 shows how MySQL actually handles these statements while operating in its default autocommit mode.

// examine the pixels int i = 0; while((i < pixelslength) && (!madeBigBlob)) { bandId = isBandColour(pixels[i]); if (bandId != -1) // pixel color is a band color madeBigBlob = addPointToBand(bandId, xc, yc); else // pixel color isn't a band color pixels[i] = WHITE; // clear the pixel to white // move to next coordinate in image xc++; if (xc == imWidth) { // at end of row xc = 0; // start next row yc++; } i++; } // update the image with the new pixels data imsetRGB(0, 0, imWidth, imHeight, pixels, 0, imWidth); } // end of analyzeImage() The image is manipulated as a pixel array by calling BufferedImagegetRGB() This makes it very simple to iterate over the pixels, using (xc, yc) to store the coordinates of the current pixel.

rendering (if required), and a layer depth to help define the order in which the sprites should be rendered.

This autocommit behavior is perfect for single statements, because MySQL is ensuring that the data modifications are indeed flushed to disk, and it maintains a consistent physical state to the data store. But what would happen in the scenario depicted in Figure 3-3

Each pixel is compared to the band colors with isBandColour(): private int isBandColour(int pixel) { // extract RGB components from the current pixel as integers int redVal = (pixel>>16)&255; int greenVal = (pixel>>8)&255; int blueVal = pixel&255; for(int i=0; i < NUM_BANDS; i++) if (bandMans[i]isBandColour(redVal, greenVal, blueVal)) return i; return -1; } // end of isBandColour() The bit manipulation at the start of isBandColour() relies on the pixel using the ARGB format This format is specified when JMFCapture creates a snap using the BufferedImageTYPE_INT_RGB constant Each pixel is a 32-bit word, with 8 bits for each color component The extracted RGB colors will have integer values between 0 and 255, with 255 meaning full-on The returned value from isBandColour() is the index of the relevant band manager in the bandMans[] array, or -1 if the pixel isn t close enough to any of the band colors.

Figure 3 1. The SpriteObject s position in the framework project It doesn t contain any object logic, however: it knows nothing about how to move or change any of its properties. This logic will be added by deriving further classes from SpriteObject, as we will see shortly. Such derived classes are generally what we will use when we build our games, but if a simple static sprite is all that is required, instances of SpriteObject can be created and added to the game. Various different constructor overloads are provided to allow the calling code to easily set some of the common properties of the class. The signatures for each of these are shown in Listing 3 3 (the bodies of the functions are omitted for brevity because they are simply setting the provided parameter values into the class properties). Listing 3 3. The available constructors for the SpriteObject class public SpriteObject(Game game) public SpriteObject(Game game, Vector2 position) public SpriteObject(Game game, Vector2 position, Texture2D texture) The class offers a lot of additional properties to allow us to control the position and appearance of the sprite, however, as follows: SpriteTexture stores a reference to a texture that can be used to render the sprite. The default implementation of the Draw method (which we will discuss in a moment) will use this texture to draw the sprite, though this behavior can be overridden if required.

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