问题描述
我Box2D的身体在同一时间（定速）移动从（0,0）这个机构（100,100），它可以。怎么可能？我想这code：this.body.setLinearVelocity（新Vector2（1,0））;但它正在不停。
I have box2d body in Andengine.I wanna move this body from (0,0) to (100,100) at a time(constant speed).How can it be possible? I tried this code: this.body.setLinearVelocity(new Vector2(1, 0)); but it is moving non-stop.
推荐答案
我想沿着pdefined路径$ P $ Body.setTransform（...）移动是使用最简单的方法。这样，我们基本上忽略所有的力，摩擦，扭矩，碰撞等，并直接设置体的位置。
I guess the easiest way to move along a predefined path would be to use Body.setTransform(...). This way we basically ignore all forces, friction, torque, collisions etc and set the position of the body directly.
我不知道Andengine，所以这只是伪code：
I don't know Andengine, so this is just pseudocode:
public void updateGameLoop(float deltaTime) {
Vector2 current = body.getPosition();
Vector2 target = new Vector2(100, 100);
if (!current.equals(target)) {
float speed = 20f;
Vector2 direction = target.sub(current);
float distanceToTarget = direction.len();
float travelDistance = speed * deltaTime;
// the target is very close, so we set the position to the target directly
if (distanceToTarget <= travelDistance) {
body.setTransform(target, body.getAngle());
} else {
direction.nor();
// move a bit in the target direction
body.setTransform(current.add(direction.mul(travelDistance)), body.getAngle());
}
}
}
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