如何在`getArrow()`函数中局部地更改条件`if(ab)`中的`x`和`y`的值。

huangapple
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英文:

how can i change the value of the x and y in if(ab) at getArrow() locally

问题

  1. public class Arrow {
  2.     protected static int x;
  3.     protected static int y;
  5.     public void setA(boolean a) {
  6.         this.a = a;
  7.     }
  9.     public void setB(boolean b) {
  10.         this.b = b;
  11.     }
  13.     public void setAb(boolean ab) {
  14.         this.ab = ab;
  15.     }
  17.     public Arrow(int x1, int y1) {
  18.         this.x = x1;
  19.         this.y = y1;
  20.     }
  22.     public double getySpeed() {
  23.         return (-ySpeed * Time + Time * Time / 10);
  24.     }
  26.     public boolean getX() {
  27.         return x + Math.abs(xSpeed * Time) < canvasWidth - 90;
  28.     }
  30.     public boolean getY() {
  31.         return y + getySpeed() < canvasHeight - 110;
  32.     }
  34.     public Matrix getArrow() {
  35.         Matrix matrix = new Matrix();
  37.         matrix.postRotate((int) getAngle(), arrowWidth / 2, arrowHeight / 2);
  38.         if (a && !ab) {
  39.             return a(x);
  40.         }
  41.         if (b && !ab) {
  42.             return b(y);
  43.         }
  44.         if (ab) {
  45.             x = x + (int) Math.abs(xSpeed * Time);
  46.             y = y + (int) getySpeed();
  47.             matrix.postTranslate(x, y);
  48.         }
  49.         return matrix;
  50.     }
  52.     public Matrix b(int yy) {
  53.         Matrix matrix = new Matrix();
  54.         matrix.postRotate((int) getAngle(), arrowWidth / 2, arrowHeight / 2);
  55.         matrix.postTranslate(canvasWidth - 90, yy);
  57.         return matrix;
  58.     }
  60.     public Matrix a(int xx) {
  61.         Matrix matrix = new Matrix();
  62.         matrix.postRotate((int) getAngle(), arrowWidth / 2, arrowHeight / 2);
  63.         matrix.postTranslate(xx, canvasHeight - 100);
  65.         return matrix;
  66.     }
  67. }

你好，这是你提供的代码的翻译部分。如果你有任何关于代码的问题或需要进一步解释，请随时提问。

英文: 
  1. public class Arrow {
  2. protected  static int x;
  3. protected  static int y;
  4. public void setA(boolean a) {
  5. this.a = a;
  6. }
  7. public void setB(boolean b) {
  8. this.b = b;
  9. }
  10. public void setAb(boolean ab) {
  11. this.ab = ab;
  12. }
  13. public Arrow( int x1, int y1) {
  14. this.x=x1;
  15. this.y=y1;
  16. }
  17. public double getySpeed(){
  18. return (-ySpeed*Time+Time*Time/10);
  19. }
  20. public boolean getX(){
  21. return x +Math.abs(xSpeed * Time)&lt;canvasWidth-90;
  22. }
  23. public boolean getY(){
  24. return y+getySpeed()&lt;canvasHeight-110;
  25. }
  26. public Matrix getArrow(){
  27. Matrix matrix = new Matrix();//1140,540
  28. matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
  29. if (a&amp;&amp;!ab) {
  30. // here if i do sout(x) it will show 75 which is the value i gave it in the constructor
  31. return a(x);
  32. }
  33. if(b&amp;&amp;!ab){
  34. // here if i do sout(y) it will show 125 which is the value i gave it in the constructor
  35. return (b(y));
  36. }
  37. if(ab){
  38. x =x+(int) Math.abs(xSpeed * Time);
  39. y = y+(int)getySpeed();
  40. matrix.postTranslate(x,y );
  41. }
  42. return matrix;
  43. }
  44. public Matrix b(int yy ){
  45. Matrix matrix = new Matrix();
  46. matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
  47. matrix.postTranslate(canvasWidth-90,yy );
  48. return matrix;
  49. }
  50. public Matrix a(int xx ){
  51. Matrix matrix = new Matrix();
  52. matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
  53. matrix.postTranslate(xx,canvasHeight-100 );
  54. return matrix;
  55. }

I am trying to make a Bitmap arrow stop from leaving the screen so I figured out the maximum x and y coordinates and the arrow moves until it reaches these coordinates.

In getArrow(), at the if(ab) block, what I think I am doing is changing x and y, but in reality, they're not changing.

  • They stay the same value I gave them in the constructor.

How can I change the x and y in the class to the value I gave them at
if(ab) in getArrow()

Thank you :*)

答案1

得分: 0

你面临的问题的原因是因为你将 x 和 y 声明为 static，使它们成为类变量，这意味着它们的值对于所有对象都是相同的。

  1. protected int x;
  2. protected int y;

只需从它们的声明中移除 static 这个修饰符。

如果有任何疑问或问题，请随意进行评论。

英文:

The reason for the issue you are facing is because you have declared x and y as static making them class variables which means their values will be the same for all objects.

  1. protected  static int x;
  2. protected  static int y;

Just remove the term, static from their declaration.

Feel free to comment in case of any doubt/issue.

huangapple
  • 本文由 发表于 2020年3月15日 21:03:57
  • 转载请务必保留本文链接：https://go.coder-hub.com/60693176.html
  • class
  • int
  • java
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