Question

我正在尝试使用按键功能在java中编写20个板堆栈来堆叠新板和鼠标点击功能，使各个板逐个消失为0.我无法弄清楚为什么我的功能赢了'他们不会按照我的命令行事，请帮忙。

 // Declare global (shared) variables here
 float plate1X = 50;
 float plate1Y = 200;
 int plateCount = 20;


 // Do not write any statements here (must be inside methods)


   // Add statements to run once when program starts here.  For example:
  void setup() { 
   size(400,400);
   plate1X = 200;
   plate1Y = 50;
   background(255);
   plate1X = width/2;
   plate1Y = height-25;



 } // end of setup method


 void draw()
 {
   // Declare local variables here (new each time through)

   // Add statements to run each time screen is updated here
   ellipse(plate1X, plate1Y, 200,50);
   stroke(0);
   fill(50,100,40);
 }





   // Screen will be repainted automatically at the end of draw method
    // end of draw method

 // Add other methods here  
 void keyPressed() {
   plate1Y = -25;
   while( plate1Y < height) 
     ellipse(plate1X, plate1Y, 200,50);

     plate1Y = plate1Y - 10;
   }
   void mousePressed() {
     while( plate1Y <= -205)
     ellipse(plate1X, plate1Y, 200,50);

     plate1Y = plate1Y + 10;
   }

Answer 1

每次调用draw()方法时都需要绘制每个板块，这通常每秒发生60次。您可以将每个板块的协调保持在两个数组plateX[]和plateY[]中，numPlates跟踪有多少个板块。您可以使用keyPressed()和mousePressed()方法向数组添加或减去条目，但不要在那里进行任何实际绘图。

// Declare global (shared) variables here
 float plate1X = 50;
 float plate1Y = 200;
 int plateCount = 20;

int numPlates = 1;
float plateX[] = new float[plateCount];
float plateY[] = new float[plateCount];

 // Do not write any statements here (must be inside methods)


   // Add statements to run once when program starts here.  For example:
  void setup() { 
   size(400,400);
   background(255);
   plate1X = width/2;
   plate1Y = height-25;
   plateX[0]=plate1X;
   plateY[0]=plate1Y;


 } // end of setup method


 void draw()
 {
   // Declare local variables here (new each time through)

   // Add statements to run each time screen is updated here
   for(int i=0;i<numPlates;++i)
    ellipse(plateX[i], plateY[i], 200,50);
   stroke(0);
   fill(50,100,40);
 }

   // Screen will be repainted automatically at the end of draw method
    // end of draw method

 // Add other methods here  
 void keyPressed() {
   plate1Y -= 25;
   if( plate1Y > 0) {
   plateX[numPlates]=plate1X;
   plateY[numPlates]=plate1Y;
     ++numPlates;
   }
 }   
  void mousePressed() {
     --numPlates;
     plate1Y += 25;
   }

如何堆叠20＆＃34;板＆＃34;使用if或while语句查找对象（椭圆形状）到20？我的功能无法正常工作

1 个答案: