英文:
how can i change the value of the x and y in if(ab) at getArrow() locally
问题
public class Arrow {
protected static int x;
protected static int y;
public void setA(boolean a) {
this.a = a;
}
public void setB(boolean b) {
this.b = b;
}
public void setAb(boolean ab) {
this.ab = ab;
}
public Arrow(int x1, int y1) {
this.x = x1;
this.y = y1;
}
public double getySpeed() {
return (-ySpeed * Time + Time * Time / 10);
}
public boolean getX() {
return x + Math.abs(xSpeed * Time) < canvasWidth - 90;
}
public boolean getY() {
return y + getySpeed() < canvasHeight - 110;
}
public Matrix getArrow() {
Matrix matrix = new Matrix();
matrix.postRotate((int) getAngle(), arrowWidth / 2, arrowHeight / 2);
if (a && !ab) {
return a(x);
}
if (b && !ab) {
return b(y);
}
if (ab) {
x = x + (int) Math.abs(xSpeed * Time);
y = y + (int) getySpeed();
matrix.postTranslate(x, y);
}
return matrix;
}
public Matrix b(int yy) {
Matrix matrix = new Matrix();
matrix.postRotate((int) getAngle(), arrowWidth / 2, arrowHeight / 2);
matrix.postTranslate(canvasWidth - 90, yy);
return matrix;
}
public Matrix a(int xx) {
Matrix matrix = new Matrix();
matrix.postRotate((int) getAngle(), arrowWidth / 2, arrowHeight / 2);
matrix.postTranslate(xx, canvasHeight - 100);
return matrix;
}
}
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:
public class Arrow {
protected static int x;
protected static int y;
public void setA(boolean a) {
this.a = a;
}
public void setB(boolean b) {
this.b = b;
}
public void setAb(boolean ab) {
this.ab = ab;
}
public Arrow( int x1, int y1) {
this.x=x1;
this.y=y1;
}
public double getySpeed(){
return (-ySpeed*Time+Time*Time/10);
}
public boolean getX(){
return x +Math.abs(xSpeed * Time)<canvasWidth-90;
}
public boolean getY(){
return y+getySpeed()<canvasHeight-110;
}
public Matrix getArrow(){
Matrix matrix = new Matrix();//1140,540
matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
if (a&&!ab) {
// here if i do sout(x) it will show 75 which is the value i gave it in the constructor
return a(x);
}
if(b&&!ab){
// here if i do sout(y) it will show 125 which is the value i gave it in the constructor
return (b(y));
}
if(ab){
x =x+(int) Math.abs(xSpeed * Time);
y = y+(int)getySpeed();
matrix.postTranslate(x,y );
}
return matrix;
}
public Matrix b(int yy ){
Matrix matrix = new Matrix();
matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
matrix.postTranslate(canvasWidth-90,yy );
return matrix;
}
public Matrix a(int xx ){
Matrix matrix = new Matrix();
matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
matrix.postTranslate(xx,canvasHeight-100 );
return matrix;
}
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。
protected int x;
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.
protected static int x;
protected static int y;
Just remove the term, static from their declaration.
Feel free to comment in case of any doubt/issue.
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