J2ME游戏开发之几何图形的绘制

1. 方法

a. 绘制空心矩形：

       drawRect(int x, int y , int width, int height);

b. 绘制实心矩形：

      fillRect(int x, int y , int width, int height);

c. 绘制椭圆

2. code

package com.sliw.graphics;



import javax.microedition.lcdui.Canvas;

import javax.microedition.lcdui.Graphics;



public class GeometryCanvas extends Canvas{



    int startY = 10;

    int height = 20;

    int tip = 10;

    

    protected void paint(Graphics g) {

        // TODO Auto-generated method stub

        clear(g);

        

        /** 绘制空心的矩形 */

        drawBlankRect(g);    

        startY = startY + height + tip;

        

        /** 绘制实心的矩形**/

        drawFillRect(g);

        startY = startY + height + tip;

        

        /** 绘制空心椭圆  **/

        drawBlankOval(g);

        startY = startY + height + tip;

        

        /** 绘制实心椭圆 **/

        drawFillOval(g);

        startY = startY + height + tip;

        

        /** 绘制类似进度条 **/

        drawBlankAndFillOval(g);

        startY = startY + height + tip;

        

        

        /** 绘制圆**/

        drawCycle(g);

    }



    private void clear(Graphics g){

        g.setColor(255,255,255);

        g.fillRect(0, 0, getWidth(), getHeight());

    }

    

    /**

     * drawRect(int x, int y , int width, int height);

     * @param g

     */

    private void drawBlankRect(Graphics g){

        

        g.setColor(255,0,0);    

        g.drawRect(10, startY, 100, height);

        

    }

    

    

    private void drawFillRect(Graphics g){

        

        g.setColor(0,255,0);

        g.fillRect(10, startY, 100, height);

    }

    

    

    /**

     * drawRoundRect(int x , int y , int width, int height, int arcWidth , int arcHeight);

     *         arcWidth 是左右弧衔接起来凑成的弧的宽度

     *         arcHeight 则是上下弧衔接起来凑成的弧的高度

     * @param g

     */

    private void drawBlankOval(Graphics g){

        g.setColor(0,0,255);    

        g.drawRoundRect(10, startY, 100, height, 20, 20);

    }

    

    private void drawFillOval(Graphics g){

        g.setColor(0,0,255);    

        g.fillRoundRect(10, startY, 100, height, 20, 20);

    }

    

    /**

     * 通过叠加的方式

     * @param g

     */

    private void drawBlankAndFillOval(Graphics g){

        g.setColor(0,0,255);    

        g.drawRoundRect(10, startY, 100, height, 20, 20);

        g.fillRoundRect(10, startY, 20, 20, 20, 20);

        g.fillRect(20, startY, 60, 20);

    }

    

    /**

     *   

     */

    private void drawCycle(Graphics g){

        g.setColor(150,150,150);

        g.drawRoundRect(10, startY, 60, 60, 60, 60);    

    }

}