我一直在研究来自http://obviam.net/index.php/a-very-basic-the-game-loop-for-android/的示例。在此我想做一些改变。
Speed.java
public class Speed {
public static final int DIRECTION_RIGHT = 1;
public static final int DIRECTION_LEFT = -1;
public static final int DIRECTION_UP = -1;
public static final int DIRECTION_DOWN = 1;
private float xv = 1; // velocity value on the X axis
private float yv = 1; // velocity value on the Y axis
private int xDirection = DIRECTION_RIGHT;
private int yDirection = DIRECTION_DOWN;
public Speed() {
this.xv = 1;
this.yv = 1;
}
public Speed(float xv, float yv) {
this.xv = xv;
this.yv = yv;
}
public float getXv() {
return xv;
}
public void setXv(float xv) {
this.xv = xv;
}
public float getYv() {
return yv;
}
public void setYv(float yv) {
this.yv = yv;
}
public int getxDirection() {
return xDirection;
}
public void setxDirection(int xDirection) {
this.xDirection = xDirection;
}
public int getyDirection() {
return yDirection;
}
public void setyDirection(int yDirection) {
this.yDirection = yDirection;
}
// changes the direction on the X axis
public void toggleXDirection() {
xDirection = xDirection * -1;
}
// changes the direction on the Y axis
public void toggleYDirection() {
yDirection = yDirection * -1;
}
}
使用此功能,图像会向所有方向移动。现在我只想限制这种从下到上的运动。 onclick的功能是,我们可以单击并将图像拖动到所需位置。我想替换它只是让图像消失或去另一个活动。请帮我改变这段代码。提前谢谢。
答案 0 :(得分:0)
如果您已经使用SurfaceView,那么在onDraw(Canvas canvas)
方法中代码用于从下到上移动图像是这样的。
canvas.drawBitmap(bitmap,xPoint,yPoint,paint);
其中bitmap是一个图像(你要移动的位图),xPoint是x坐标,yPoint是y坐标,paint是一个Paint,它也可以是null。
并且从下到上移动只需更新
yPoint = yPoint - 1;
在onDraw()
之前的任何帖子中
。
愿这对你有所帮助。