我目前正在参加高中编程1课程，正在完成我的最终项目。我们被允许创造我们想要的任何东西，我决定制作一个程序，其中有一个吉他脖子的前12个音品，你可以点击一个音品中的一个字符串，它会告诉你它是什么音符以及播放什么这个音符听起来像。我设法让我的程序告诉我在我设置的第一个矩形上选择了什么。然后我复制了一堆代码并更改了值以产生其余的烦恼。但是，当我尝试点击一个时，它不再告诉我我正在按什么音符。我的程序构建和执行正常，没有错误，所以我不太清楚该做什么，我真的可以用一只手。任何和所有回复都非常感谢！
import java.awt.*;
import java.applet.Applet;
public class Final extends Applet
{
//s6f1 stands for string 6 fret 1
int sf;
Rectangle s6f1, s6f2, s6f3, s6f4, s6f5, s6f6, s6f7, s6f8, s6f9, s6f10, s6f11, s6f12;
public static void main (String[] args)
{
}
public void paint (Graphics g)
{
drawNeck(g);
int x = 690;
int y = 153;
Expo.setColor(g,Expo.red);
Expo.setFont(g,"Arial",Font.BOLD,28);
switch (sf)
{
case 1 :
Expo.drawString(g,"F",x,y);
break;
case 2 :
Expo.drawString(g,"F#/Gb",x,y);
break;
case 3 :
Expo.drawString(g,"G",x,y);
break;
case 4 :
Expo.drawString(g,"G#/Ab",x,y);
break;
case 5 :
Expo.drawString(g,"A",x,y);
break;
case 6 :
Expo.drawString(g,"A#,Bb",x,y);
break;
case 7 :
Expo.drawString(g,"B",x,y);
break;
case 8 :
Expo.drawString(g,"C",x,y);
break;
case 9 :
Expo.drawString(g,"C#/Db",x,y);
break;
case 10 :
Expo.drawString(g,"D",x,y);
break;
case 11 :
Expo.drawString(g,"D#/Eb",x,y);
break;
case 12 :
Expo.drawString(g,"E",x,y);
break;
}
}
public void init()
{
int m = 50;
int n = 10;
//s stands for string, f stands for fret; ex: s6f1 means String 6 Fret 1
s6f1 = new Rectangle (50,198,m,n);
s6f2 = new Rectangle (101,198,m,n);
s6f3 = new Rectangle (151,198,m,n);
s6f4 = new Rectangle (201,198,m,n);
s6f5 = new Rectangle (251,198,m,n);
s6f6 = new Rectangle (301,198,m,n);
s6f7 = new Rectangle (351,198,m,n);
s6f8 = new Rectangle (401,198,m,n);
s6f9 = new Rectangle (451,198,m,n);
s6f10 = new Rectangle (501,198,m,n);
s6f11 = new Rectangle (551,198,m,n);
s6f12 = new Rectangle (601,198,m,n);
sf = 0;
}
public boolean mouseDown(Event e, int x, int y)
{
if(s6f1.inside(x,y))
sf = 1;
if(s6f2.inside(x,y))
sf = 2;
if(s6f3.inside(x,y))
sf = 3;
if(s6f4.inside(x,y))
sf = 4;
if(s6f5.inside(x,y))
sf = 5;
if(s6f6.inside(x,y))
sf = 6;
if(s6f7.inside(x,y))
sf = 7;
if(s6f8.inside(x,y))
sf = 8;
if(s6f9.inside(x,y))
sf = 9;
if(s6f10.inside(x,y))
sf = 10;
if(s6f11.inside(x,y))
sf = 11;
if(s6f12.inside(x,y))
sf = 12;
else
sf = 100;
repaint();
return true;
}
public static void drawNeck (Graphics g)
{
int a = 50;
int b = 225;
int c = 650;
//The Background
Expo.setColor(g,Expo.black);
Expo.fillRectangle(g,0,0,1000,650);
Expo.setColor(g,Expo.lightPink);
Expo.fillRectangle(g,10,10,990,640);
//The neck
Expo.setColor(g,Expo.brown);
Expo.fillRectangle(g,50,50,650,225);
//The frets
Expo.setColor(g,Expo.black);
Expo.drawLine(g,100,a,100,b);
Expo.drawLine(g,150,a,150,b);
Expo.drawLine(g,200,a,200,b);
Expo.drawLine(g,250,a,250,b);
Expo.drawLine(g,300,a,300,b);
Expo.drawLine(g,350,a,350,b);
Expo.drawLine(g,400,a,400,b);
Expo.drawLine(g,450,a,450,b);
Expo.drawLine(g,500,a,500,b);
Expo.drawLine(g,550,a,550,b);
Expo.drawLine(g,600,a,600,b);
Expo.drawLine(g,650,a,650,b);
//The Inlays
Expo.setColor(g,Expo.white);
Expo.fillCircle(g,175,137,10);
Expo.fillCircle(g,275,137,10);
Expo.fillCircle(g,375,137,10);
Expo.fillCircle(g,475,137,10);
Expo.fillCircle(g,625,112,10);
Expo.fillCircle(g,625,163,10);
//The Strings
Expo.setColor(g,Expo.grey);
Expo.fillRectangle(g,a,73,c,77);
Expo.fillRectangle(g,a,98,c,102);
Expo.fillRectangle(g,a,123,c,127);
Expo.fillRectangle(g,a,148,c,152);
Expo.fillRectangle(g,a,173,c,177);
Expo.fillRectangle(g,a,198,c,202);
//String names and Fret numbers
Expo.setColor(g,Expo.blue);
Expo.setFont(g,"Arial",Font.BOLD,14);
Expo.drawString(g,"E",20,210);
Expo.drawString(g,"A",20,180);
Expo.drawString(g,"D",20,155);
Expo.drawString(g,"G",20,130);
Expo.drawString(g,"B",20,105);
Expo.drawString(g,"e",20,75);
Expo.drawString(g,"Note:",680,120);
Expo.setFont(g,"Arial",Font.ITALIC,24);
Expo.drawString(g,"Created by Mitchell",640,635);
//The User-interface
//The Chords area
int t = 150;
Expo.setFont(g,"Arial",Font.BOLD,28);
Expo.drawString(g,"Chords:",800,50);
Expo.setColor(g,Expo.lightBlue);
Expo.fillRectangle(g,700+t,80,740+t,120);
Expo.fillRectangle(g,750+t,80,790+t,120);
Expo.fillRectangle(g,700+t,130,740+t,170);
Expo.fillRectangle(g,750+t,130,790+t,170);
Expo.fillRectangle(g,700+t,180,740+t,220);
Expo.fillRectangle(g,750+t,180,790+t,220);
//The note area
Expo.fillRectangle(g,680,123,745,163);
}
}
其他信息： - 我的高中课程使用Expo java文件作为applet - 这就是我运行applet时的样子：http://imgur.com/N86wkkq
答案 0 :(得分：1)
问题在于 所以 解决方案：使用if - mouseDown中的级联。由于您不使用else if，所有if语句都会被评估，无论哪个语句实际产生true。这不是一个大问题，但最后一个if有一个else部分，每次你都不会点击s6f12时会执行。< / p>
sf总是12或100。else if：if (s6f1.inside(x,y)) sf = 1;
else if (s6f2.inside(x,y)) sf = 2;
else if (s6f3.inside(x,y)) ...
...
else sf = 100;