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到我的鼠标位置？

我有以下变量：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);