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ExtendedImage im=new ExtendedImage(new Image(24,24)); imsetPixel(5,0,(byte)1); //black pixel at pos 5,0 public void setPixels(byte[] pixels, int x, int y, int width, int height) This lets you create an image using a byte array Each bit of the array
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indicates the color of the pixel You can then render this image at a given x,y location Note that the x location must be divisible by eight For example, to draw a black line that is 8 pixels across and 2 pixels high, create a byte array with two bytes set to 1 The decimal value of 1 is all ones 11111111 You could then draw this line at location 4x1 within an empty image:
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ExtendedImage im=new ExtendedImage(new Image(24,24)); byte[] pix=new byte[] { (byte)-1, (byte)-1 } ; imsetPixels(pix, 8, 1, 8, 2);
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Alternatively, you can grab the information from an image using
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public int getPixel(int x, int y)
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public void getPixelBytes(byte[] pixels, int x, int y, int width, int height)
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Blitting
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To create high-performance graphics, many games will directly modify the video screen, avoiding the overhead of fancy paint and double buffering routes The process of copying a large array of bits directly into video memory is known as blitting You can easily blit with any ExtendedImage Simply call the blitToScreen(int x,int y) routine, passing in the exact x and y positions you want your image to appear:
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myimgblitToScreen(10,15);
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The most typical usage is to draw all sprites, tiles, and so on to an offscreen image, and then blit that big image onto the screen A typical game's paint routine would use a GraphicObjectManager to paint all sprites and tiles to an offscreen ExtendedImage, as shown in the following code snippet:
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public void paint(Graphics g) { gameScreenclear((byte)0); try { gfxManagerpaint(gameScreen, 0, 0); gameScreenblitToScreen(0,0); } catch(Exception e) { } }
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Graphic Objects
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Every Sprite or ExtendedImage you create is a subclass of the GraphicObject class This class basically only has two methods, enabling you to show or hide the graphic:
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public void setVisible(Boolean visible) public boolean getVisible()
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You can actually deal with all your objects using the GraphicObjectManager class New objects are added, by default, to the end of the list When objects are drawn, the first element in the list will be drawn first Positioning objects in the manager enables you to layer them behind or in front of each other The class has the following methods:
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public void paint(Image image, int x, int y) The key routine Draws
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all the objects into the given image (usually an offscreen image) The offscreen image must not be transparent This offscreen image can then be smoothly blitted onto the device's screen public void addObject(GraphicObject gobject) Adds a new object to the object manager at the end of the list public void insertObject(GraphicObject gobject, int position) Adds a new object at a specific location in the list public int getObjectPosition(GraphicObject gobject) Returns the number associated with the given object public GraphicObject getObjectAt(int index) Returns the object at the given index public void deleteObject(GraphicObject gobject) Deletes the given object from the manager public void deleteObject(int position) Deletes the object at the given position from the ObjectManager public void paint(ExtendedImage image, int x, int y) Draws all objects to the given ExtendedImage offscreen object
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public static byte[] createTextureBits(int width, int height, byte[] texture) Converts a texture from bytes per pixel into bits per pixel This
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enables you to "compress" an image into fewer bytes For example, the image
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{0,0,1,1,1,1,0,0} would be converted into just one byte: {60}
Sprites
In 15, "Entering the Land of Sprites," we discussed what sprites are basically, any character or graphical object in your game that needs to be animated or moved Siemens phones have a special Sprite class, a subclass of GraphicObject The Sprite class lets you do pretty much anything you can think of:
public void setPosition(int x, int y This enables you to drop the upper
right corner of the sprite at a specific set of coordinates
public void setCollisionRectangle(int x, int y, int width, int height) This enables you to create a specific collision rectangle around the sprite