barcanvas.java

j2me的程序

import javax.microedition.lcdui.*;

class BarCanvas extends Canvas {
        int Data1[];
        int Data2[];
        int maxX, maxY;
        int DataColors[]={0xFF0FF0,0x00F0F0};
        public BarCanvas(int[] Data1, int[] Data2, int maxX, int maxY) {
            this.Data1=Data1;
            this.Data2=Data2;
            this.maxX=maxX;
            this.maxY=maxY;
        }

        public void paint(Graphics g) {

            int width=this.getWidth();
            int height=this.getHeight();

            g.setColor(0xFFFFFF);
            g.fillRect(0,0,width,height);

            g.setColor(0x000000);
            g.drawLine(0,height,0,0);
            g.drawLine(0,height-1,width,height-1);

            int deltaX=width/(maxX+1);
            int deltaY=height/maxY;

            int barWidth=deltaX/4;


            g.setColor(DataColors[0]);
            for (int i=0; i<Data1.length; i++) {
                g.fillRect(deltaX*i, height-deltaY*Data1[i], barWidth, deltaY*Data1[i]);
            }


            g.setColor(DataColors[1]);
            for (int i=0; i<Data2.length; i++) {
                g.fillRect(deltaX*i+barWidth, height-deltaY*Data2[i], barWidth, deltaY*Data2[i]);
            }
        }
}