java图形设计和多媒体基础-亚博电竞手机版
java学习
2020年03月25日 23:40
2
本文主要介绍了java的图形设计以及多媒体处理，源码作者也做了详细的注释，对于初学者应该不难。详细请看下文。
同心圆效果图：
/** *程序要求：新建一个600*600像素的应用程序窗口，并在窗口中绘制5个不同颜色的同心圆， *所有圆心都是屏幕的中心点，相邻两个圆直接的半径相差50像素 *效果图如下图所示（颜色随机设置），源程序保存为ex7_1.java。 *作者：wwj *日期：2012/4/25 *功能：显示一个有5个不同颜色的同心圆 **/ import javax.swing.*; import java.awt.*; import java.awt.color; public class ex7_1 extends jframe { int red,green,blue; color color; public ex7_1() { super("一个有5个不同颜色的同心圆"); //显示窗口名称 setsize(600,600); //设置窗口大小 setvisible(true); //设置为可见 setdefaultcloseoperation(jframe.exit_on_close);//设置窗口关闭动作 } public void paint(graphics g) { //第一个圆 red=(int)(math.random()*255); green=(int)(math.random()*255); blue=(int)(math.random()*255); color=new color(red,green,blue); g.setcolor(color); g.filloval(175,175,250,250); //第二个圆 red=(int)(math.random()*255); green=(int)(math.random()*255); blue=(int)(math.random()*255); color=new color(red,green,blue); g.setcolor(color); g.filloval(200,200,200,200); //第三个圆 red=(int)(math.random()*255); green=(int)(math.random()*255); blue=(int)(math.random()*255); color=new color(red,green,blue); g.setcolor(color); g.filloval(225,225,150,150); //第四个圆 red=(int)(math.random()*255); green=(int)(math.random()*255); blue=(int)(math.random()*255); color=new color(red,green,blue); g.setcolor(color); g.filloval(250,250,100,100); //第五个圆 red=(int)(math.random()*255); green=(int)(math.random()*255); blue=(int)(math.random()*255); color=new color(red,green,blue); g.setcolor(color); g.filloval(275,275,50,50); } public static void main(string[] args) { ex7_1 e = new ex7_1(); } } 播放音乐和切换图片的小程序效果图：
/** *程序要求:编写一个applet的小程序，准备5幅图片和三个音乐文件，绘制到applet中， *并增加几个按钮，控制图片的切换、放大、缩小和音乐文件的播放。 *作者：wwj *日期：2012/4/29 *参考：neicole *功能：能进行图片和歌曲的选择变换的applet小程序 **/ import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.applet.applet; import java.applet.audioclip; public class ex7_2 extends applet implements actionlistener,itemlistener { //创建两个面板 jpanel p1=new jpanel(); jpanel p2=new jpanel(); jpanel p3=new jpanel(); //声音对象 audioclip[] sound=new audioclip[3]; int playingsong=0; //切换图片的按钮 jbutton lastpic=new jbutton("上一张"); jbutton setlarge=new jbutton("放大"); jbutton setlittle=new jbutton("缩小"); jbutton nextpic=new jbutton("下一张"); //切换歌曲的按钮 jbutton lastsound=new jbutton("上一首"); jbutton play=new jbutton("播放"); jbutton loop=new jbutton("连续"); jbutton stop=new jbutton("停止"); jbutton nextsound=new jbutton("下一首"); //曲目下拉列表 jcombobox xx; string names[]={ "曲目1.wav","曲目2.wav","曲目3.wav"}; //创建画布对象 mycanvasl showphotos; public void init() { //窗口布局 this.setlayout(new borderlayout()); //为图片控制按钮注册监听器 lastpic.addactionlistener(this); setlarge.addactionlistener(this); setlittle.addactionlistener(this); nextpic.addactionlistener(this); //向面板p1添加组件 p1.add(lastpic); p1.add(setlarge); p1.add(setlittle); p1.add(nextpic); p1.repaint(); //实例化下拉列表对象 xx = new jcombobox(names); xx.additemlistener(this); //为控制播放音乐按钮注册监听器 lastsound.addactionlistener(this); play.addactionlistener(this); loop.addactionlistener(this); stop.addactionlistener(this); nextsound.addactionlistener(this); for(int i=0;i<3;i ) { sound[i]=getaudioclip(getcodebase(),"music/" "曲目" integer.tostring(i 1) ".wav"); } //向面板p2添加组件 p2.add(xx); p2.add(lastsound); p2.add(play); p2.add(loop); p2.add(stop); p2.add(nextsound); p2.repaint(); showphotos = new mycanvasl(); p3.add(showphotos); p3.repaint(); //把面板p1和p2分别布置到窗口的北部和南部 add(p1,borderlayout.north); add(p2,borderlayout.south); add(p3,borderlayout.center); this.repaint(); } //按钮的事件处理 public void actionperformed(actionevent e) { if(e.getsource() == lastpic){ showphotos.changephotoshow('p'); } else if(e.getsource() == nextpic){ showphotos.changephotoshow('n'); } else if(e.getsource() == setlarge){ showphotos.changephotosize('b'); } else if(e.getsource() == setlittle){ showphotos.changephotosize('s'); } else if(e.getsource()==lastsound){ //上一首 sound[playingsong].stop(); playingsong=(playingsong-1 3)%3; xx.setselectedindex(playingsong); sound[playingsong].play(); } else if(e.getsource()==play){ //按下播放按钮 sound[playingsong].play(); } else if(e.getsource()==loop){ //按下循环按钮 sound[playingsong].loop(); } else if(e.getsource()==stop){ //按下停止按钮 sound[playingsong].stop(); } else{ //下一首 sound[playingsong].stop(); playingsong=(playingsong 1)%3; xx.setselectedindex(playingsong); sound[playingsong].play(); } } //下拉列表的事件处理 public void itemstatechanged(itemevent e) { sound[playingsong].stop(); sound[playingsong]=getaudioclip(getcodebase(),"music/" xx.getselecteditem()); } class mycanvasl extends canvas { public image[] img=new image[5]; int maxwidth = 600; int maxheight = 500; int nowimageindex = 0; int coordinatex = 0; int coordinatey = 0; int currentwidth = maxwidth; int currentheight = maxheight; mycanvasl(){ setsize(maxwidth,maxheight); //获取当前目录下的图片 for(int i=0;i<5;i ){ img[i]=getimage(getcodebase(),"image/" integer.tostring(i 1) ".jpg"); } } private void changephotoindex(int index){ nowimageindex = index; changephotosize('m'); } public void changephotoshow(char command){ if('p' == command){ changephotoindex((nowimageindex 5 - 1 ) % 5); } else if('n' == command){ changephotoindex((nowimageindex 1) % 5); } } public void changephotosize(char command){ if ('m' == command){ currentwidth = maxwidth; currentheight = maxheight; } else if ('b' == command){ if(maxwidth >= (currentwidth 100) && maxheight >= (currentheight 100)){ currentwidth = 100; currentheight = 100; } } else if('s' == command){ if((0 < (currentwidth - 100)) && (0 < (currentheight - 100))){ currentwidth = currentwidth - 100; currentheight = currentheight - 100; } } coordinatex = (maxwidth - currentwidth) / 2; coordinatey = (maxheight - currentheight) / 2; repaint(); } //paint方法用来在窗口显示图片 public void paint(graphics g){ g.drawimage(img[nowimageindex],coordinatex,coordinatey,currentwidth,currentheight,this); } } } 展开全文