import javax.microedition.lcdui.*;

 public class Gradient extends Canvas {

static int width,height,red,green,blue;

 public Gradient() {
setFullScreenMode(true);
width=getWidth();
height=getHeight();
 }

 public void paint(Graphics g) {
drawHGradient(255,0,0,0,0,255,g,0,0,width,height/2);
drawVGradient(255,255,255,0,0,0,g,0,height/2,width,height/2);
repaint();
 }

 public static void drawHGradient(int r1,int g1,int b1,int r2,int g2,int b2,Graphics g,int corX,int corY,int sw,int sh) {
sh+=corY;
for(int i=0; i<sw+1; i++) {
red=r1+((r2-r1)*i/sw);
green=g1+((g2-g1)*i/sw);
blue=b1+((b2-b1)*i/sw);
g.setColor(red,green,blue);
g.drawLine(corX,corY,corX,sh);
corX++;
 }
 }

 public static void drawVGradient(int r1,int g1,int b1,int r2,int g2,int b2,Graphics g,int corX,int corY,int sw,int sh) {
for(int i=0; i<sh+1; i++) {
red=r1+((r2-r1)*i/sh);
green=g1+((g2-g1)*i/sh);
blue=b1+((b2-b1)*i/sh);
g.setColor(red,green,blue);
g.drawLine(corX,corY,sw-1,corY);
corY++;
 }
 }
}