操纵杆的触摸屏幕上的算法 [英] Algorithm of the joystick on the touchable screen
问题描述
我想模拟喜欢这幅画在触摸屏上的模拟操纵杆。
I would like to simulate an analog joystick on the touchable screen like this picture.
当棍子区域的中心设置为(CX,CY),我应该怎么计算的X方向的比例和Y方向比(-1.0〜1.0),从触摸的位置(TX,TY)?
When the center of the stick area is set to (cx, cy), how should I calculate X-direction ratio and Y-direction ratio(-1.0~1.0) from the touched position(tx, ty)?
推荐答案
的x方向比为(TX-CX)/ r,其中r是圆的半径大小。同样,y方向比为(TY-CY)/ r次。
The x direction ratio is (tx-cx)/r, where r is the radius magnitude of the circle. Similarly, the y direction ratio is (ty-cy)/r.
我假定在画面的右方向为x轴右旋笛卡尔坐标。否则,你可能需要乘以(-1),以调整方向。
I am assuming a right-handed cartesian coordinate with x axis in the direction of the right of the picture. Otherwise, you may need to multiply a (-1) to adjust the direction.
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