plot2dcanvas.java

j2me的程序

import javax.microedition.lcdui.*;

class Plot2DCanvas extends Canvas{
	  int width;
	  int height;
      int line1[];
      int line2[];
      int maxX, maxY;

      Plot2DCanvas(int[] line1, int[] line2, int maxX, int maxY) {
            this.line1=line1;
            this.line2=line2;
            this.maxX=maxX;
            this.maxY=maxY;
      }

      public void paint(Graphics g) {
            width=this.getWidth();
            height=this.getHeight();

            g.setGrayScale(255);
            g.fillRect(0,0,width,height);

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

            int deltaX=width/maxX;
            int deltaY=height/maxY;

            for (int i=0; i<line1.length-1; i++) {
                g.drawLine(deltaX*i,height-deltaY*line1[i],deltaX*(i+1),height-deltaY*line1[i+1]);
            }

            g.setStrokeStyle(Graphics.DOTTED);
            for (int i=0; i<line2.length-1; i++) {
                g.drawLine(deltaX*i,height-deltaY*line2[i],deltaX*(i+1),height-deltaY*line2[i+1]);
            }
        }
    }