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In J2ME, images are expressed using 24 bits per pixel This means that J2ME, in theory, can handle full-color images To define each pixel's color, three bytes are used 8 bits for the red component, 8 for the green, and 8 for the blue Because most micro devices don't support all 24 bits, they map colors requested by the application into colors available on the device For example, even though J2ME may support millions of colors, a device may only be able to handle black, white, and gray The current color of the Graphics object can be set by calling the GraphicssetColor() method The color's red-green-blue components can be set separately or as an integer value For example, the color red can be set using
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setColor(255, 0, 0);
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setColor(0xff0000);
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The methods getRedComponent(), getGreenComponent(), and getBlueComponent() return the values of the current color Currently, most mobile phones in the USA and Europe are black and white, offering only a few shades of gray To see how the color is mapped into a gray scale, use the getGrayScale() method
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Lines, arcs, rectangles, and rounded rectangles may be drawn with either a SOLID or a DOTTED stroke style set by the GraphicssetStrokeStyle() method For the SOLID stroke style, drawing operations are performed with a one-pixel wide pen that fills the pixel immediately below and to the right of the specified coordinate Drawn lines touch pixels at both endpoints Drawing operations under the DOTTED stroke style will touch a subset of pixels that would have been touched under the SOLID stroke style The frequency and length of dots is implementationdependent
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Drawing Lines
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To draw a line, use the GraphicsdrawLine() method It accepts four parameters: x1, y1, x2, and y2 The parameters set two points on the screen (x1,y1) and (x2,y2), and a line is drawn between them The current color and stroke style are used to draw the line To create a dotted line in the middle of the road for our car racing game, you could use code similar to
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public void paint(Graphics g) { gsetStrokeStyle(GraphicsDOTTED); gdrawLine(getWidth() / 2, 0, getWidth() / 2, getHeight() - 1); }
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This code snippet uses the Canvas getWidth() method to get the display's width so the line is put in the middle Figure 141 shows the result of the paint() method Figure 141 A dotted line
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Drawing Rectangles
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To draw a rectangle, the drawRect() method is used Much like drawLine(), it also accepts four parameters: x, y, width, and height The point (x,y) sets the upper-left coordinate of the rectangle and then draws the box with the given width and height The rectangle can be solid or dotted, and is drawn in the currently specified color
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You can also draw filled rectangles with the fillRect() method The current color is used as the fill The resulting rectangle will cover an area that is (width+1) pixels wide and (height+1) pixels tall To draw the edges of the road, we could add on to our dotted line and use this code:
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public void paint(Graphics g) { gsetStrokeStyle(GraphicsDOTTED); gdrawLine(getWidth() / 2, 0, getWidth() / 2, getHeight() - 1); gsetStrokeStyle(GraphicsSOLID); gfillRect(0, 0, (getWidth() - ROAD_WIDTH) / 2, getHeight()); gfillRect((getWidth() + ROAD_WIDTH) / 2, 0, (getWidth() - ROAD_WIDTH) / 2, getHeight()); }
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The fillRect() method is called twice: once to create the left edge of the road, and once to create the right Setting a solid style doesn't affect the filled rectangles, but will be used later for further drawings To give the road a fixed width, the ROAD_WIDTH constant is used Figure 142 illustrates our new road Figure 142 The side of the road
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To draw a rectangle with rounded corners, use the drawRoundRect() method Similarly, you can fill a round rectangle using the fillRoundRect() method Both of these methods accept six parameters four of them are equal to parameters in drawRect() and fillRect(), and two additional parameters provide the horizontal and vertical diameters of the arc at all four corners
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