python - 我的球/球棒碰撞和反射有什么问题？答案

【问题标题】：python - what's wrong with my ball/bat collision and reflection?python - 我的球/球棒碰撞和反射有什么问题？
【发布时间】：2016-03-02 08:22:12
【问题描述】：

我写了一个突围风格的游戏，除了球棒碰撞和反射之外，它都可以正常工作。它应该可以工作，如果球在击球时从左向右移动：

如果它击中左端，它会弹回原来的方向如果它击中右端，它会朝同一个方向反弹

从右到左的方向反之亦然。并且：

如果它击中中间区域，它会以相同的角度反弹回来如果它击中中心的左/右区域，它会弹回并略微改变角度。

它有时也会穿过球棒，即使它在球棒上方并且应该反弹，这令人困惑，但我认为可能是由于 `BH == Bat.y 线，因为球以一定角度移动所以可能会稍微结束，然后继续。

代码：（BAW/H = 球棒宽度/高度，BW/H = 球宽度/高度）

# check with bat

if theball.y+BH == thebat.y and (theball.x >= thebat.x-5 and theball.x <= thebat.x+BATW): 

# collision in centre - rebounds with angle reflection == angle incidence

    if theball.cx>= thebat.x+40 and theball.cx<=thebat.x+60:
        theball.dy = -theball.dy
        return

    # else find ball direction, do all areas for each direction

    if theball.oldx < theball.x: # ball moving left to right, find which area: ends, mid lef, mid right, centre

        # collision with left end

        if theball.cx<= thebat.x+10:

        # ball rebounds back in direction it came from

            theball.dx = - theball.dx
            theball.dy = - theball.dy
            return

        # collision with right end

        if theball.cx >= thebat.x+90:

            angle -= 10
            if angle < MIN_ANGLE:
                angle = MIN_ANGLE

            theball.dx, theball.dy = calc_dxdy(angle)
            return  

        # middle left and right 

        # mid left

        if (theball.cx > thebat.x+10 and theball.cx < thebat.x+40):

            angle -=5
            if angle <= MIN_ANGLE:
                angle = MIN_ANGLE
                theball.dx, theball.dy = calc_dxdy(angle)
                return

        # mid right

        if  (theball.cx > thebat.x+60 and theball.cx < thebat.x+90):

            angle +=5
            if angle >= MAX_ANGLE:
                angle = MAX_ANGLE
                theball.dx, theball.dy = calc_dxdy(angle)
                return  

    # ball moving right to left

    if theball.oldx > theball.x: # ball moving right to left, find which area: ends, mid lef, mid right, centre

        # collision with right end

        if theball.cx>= thebat.x+90: 

        # ball rebounds back in direction it came from

            theball.dx = - theball.dx
            theball.dy = - theball.dy
            return

        # collision with right end

        if theball.cx <= thebat.x+10:

            angle += 10
            if angle > MAX_ANGLE:
                angle = MAX_ANGLE

            theball.dx, theball.dy = calc_dxdy(angle)
            return  

        # middle left and right 

        # mid left

        if (theball.cx > thebat.x+10 and theball.cx < thebat.x+40):

            angle +=5
            if angle <= MAX_ANGLE:
                angle = MAX_ANGLE
                theball.dx, theball.dy = calc_dxdy(angle)
                return

        # mid right

        if  (theball.cx > thebat.x+60 and theball.cx < thebat.x+90):

            angle -=5
            if angle >= MIN_ANGLE:
                angle = MIN_ANGLE
                theball.dx, theball.dy = calc_dxdy(angle)
                return

【问题讨论】：

标签： python collision-detection collision

【解决方案1】：

你是对的，这是因为

theball.y+BH == thebat.y

在某个角度，球不太可能处于完全正确的高度。尝试添加一些不确定性。例如：

UNCERTAINTY = 10
if theball.y+BH - UNCERTAINTY <= thebat.y <= theball.y+BH + UNCERTAINTY and ...

【讨论】：