calccanvas.java~2~

一个j2me写的手机计算器程序

package my.calc;

import com.nokia.mid.ui.FullCanvas;
import javax.microedition.lcdui.*;
import java.io.*;

public class CalcCanvas extends FullCanvas{
  /**退出按钮*/
  private Command cmdExit;
  /**标题*/
  private String title = "Calculator";
  /**字体*/
  private Font f;
  /**显示的数字*/
  private int result = 0;
  /**焦点编号*/
  private int num = 0;
  /**图片起点坐标*/
  private int x = 20;
  private int y = 70;
  /**按钮尺寸*/
  private int buttonWidth = 38;
  private int buttonHeight = 28;
  /**图片文件*/
  private Image image = null;
  /**默认构造方法*/
  public CalcCanvas() {
    try{
      image = Image.createImage("/calc.png");
      System.out.println(x);
    }catch(IOException e){
      //ignore
      System.out.println(e);
    }
  }
  /**
   * 绘制
   * @param g 图形对象
   */
  public void paint(Graphics g) {
    f = g.getFont();
    //绘制标题
    g.drawString(title,getWidth() / 2,f.getHeight() / 2,Graphics.TOP|Graphics.HCENTER);
    //绘制文本框
    g.drawRect(3,24,172,20);
    //绘制数字
    String temp = Integer.toString(result);
    g.drawString(temp,getWidth() - temp.length() / 2 - 3,30,Graphics.TOP|Graphics.RIGHT);
    //绘制面板
    g.drawImage(image,2,50,Graphics.TOP|Graphics.LEFT);
  }
  /**
   * 事件处理
   * @param keyCode 按钮值
   */
  public void keyPressed(int keyCode){
    String keyName = getKeyName(keyCode);
    System.out.println(keyName);
  }
  /**
   * 绘制焦点矩形
   * @param g 图形对象
   * @param x X坐标
   * @param y Y坐标
   */
  public void drawFoucs(Graphics g,int x,int y){

  }
}