libgdx - 在 Box2D 中拍摄 (LibGDX)

Question

我应该设置什么值：'setLinearVelocity(x, y);' 对象身体，如果我想从玩家身体的中心射击它到我的鼠标位置？

我有这些变量可用：mouseX、mouseY、playerX、playerY。

Answer 1

float velx = mouseX - playerX;
float vely = mouseY - playerY;
float length = Math.sqrt(velx * velx + vely * vely);
if (length != 0) {
      velx = velx / length;
      vely = vely / length;
}
float finalVelx = velx * speed;
float finalVely = vely * speed;

setLinearVelocity(finalVelx,finalVely);