Motorola J2ME Specifications download pdf (Page 45)

Gaming API and Sound

24-bit color format (0xRRGGBB). The method parameters are the following: dest -

The mutable destination Image whose pixels will be set;

x - The horizontal location of

left edge of the region;

y - The vertical location of the top edge of the region; width

- The width of the region;

height - The height of the region; and rgbData - The

array of RGB pixel values.

• public static void setPixels(javax.microedition.lcdui.Image dest, int[] rgbData) throws

ArrayIndexOutOfBoundsException, IllegalArgumentException – Sets RGB pixel data

in the entirety of the destination image. The data must be stored in the int array in

row-major order using the standard 24-bit color format (0xRRGGBB). The method

parameters are

dest - The mutable destination Image whose pixels will be set, and

rgbData - The array of RGB pixel values.

• public static Image getScaleImage(javax.microedition.lcdui.Image src, int width,

int height, int method) throws IllegalArgumentException – Creates a scaled version of

the source image using the desired scaling method. All platforms must implement the

SCALE_REPLICATE scaling method; other scaling methods may be optionally

supported. SCALE_REPLICATE is used if the requested scaling method is not

supported by the device. The method parameters are the following:

src - the source

Image;

width - the width, in pixels, of the new Image, height - the height, in

pixels, of the new Image, and

method - The desired method to be used to scale the

image data (see the item 0).

Using ImageUtil

The following code sample uses an image (tank.png) to create a data structure

(

rgbData) to stores the RGB pixel data. The rgbData is used to draw the same

image.

The following is a code sample to show implementation of

rgbData:

rgbData

try {

Image tank = Image.createImage("tank.png");

} catch(Exception e) {

// The image can't be loaded

}

// creates a data structure to stores the RGB pixel data from Image

int rgbData[] = new int[tank.getHeight()*tank.getWidth()];

// Stores the RGB pixel data from Image

ImageUtil.getPixels(tank,rgbData);

// Draws the image pixel by pixel with the respective RGB pixel

data

for (i=0;i<tank.getHeight();i++) {

for (j=0;j<tank.getWidth();j++) {

g.setColor(rgbData[i*tank.getWidth() + j]);

g.fillRect(j,i,1,1);

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Motorola J2ME Specifications Page 45

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