[英]Colliding shapes in python
我的計划是創建一個“簡單”的2人小游戲(例如,相撲和種族)。
我的目標是有效地與正方形,圓形(和三角形?)形狀的對象(可能是環境的一部分)發生碰撞(我當前的代碼只能處理簡單的牆體物理和對象的運動)。或不可移動的障礙物)或部分用戶控制的物品(例如“汽車”或可推動的障礙物)。 知道如何在碰撞中也考慮質量也很高興。
我需要兩個方面的幫助:
兩個運動物體(具有質量和2D矢量)之間的不同類型的動態碰撞(物理部分不是檢測部分)。
確保所有需要碰撞的東西都以足夠快的速度碰撞(這樣我的慢速計算機仍然可以每秒渲染40-60幀以上),並按照特定的規則(或者是否有可能按照一條規則進行渲染?) 。 這樣也就不難管理需要碰撞的對象(添加,刪除,修改等)。
還是我應該為ex實現兩種類型的碰撞? 靜態+動態圈和動態+動態圈?
def checkcollisions(object1, object2):
# x is the current x position
# y is the current y position
# angle is the current vector angle (calculated from x and y with pythagoros
# speed is the length of the vector
dx = object1.x - object2.x
dy = object1.y - object2.y
dist = hypot(dx, dy)
if dist < object1.radius + object2.radius:
angle = atan2(dy, dx) + 0.5 * pi
total_mass = object1.mass + object2.mass
'''''http://www.petercollingridge.co.uk/pygame-physics-simulation/mass'''''
if (0.79 <= object1.angle < 2.36 or 0.79-2*pi <= object1.angle < 2.36-2*pi) or (3.93 <= object1.angle < 5.5 or 3.93-2*pi <= object1.angle < 5.5-2*pi) and ((0.79 <= object2.angle < 2.36 or 0.79-2*pi <= object2.angle < 2.36-2*pi) or (3.93 <= object2.angle < 5.5 or 3.93-2*pi <= object2.angle < 5.5-2*pi)):
(object2angle, object2speed) = vectorsum((object2.angle, object2.speed*(object2.mass-object1.mass)/total_mass), (angle+pi, 2*object1.speed*object1.mass/total_mass))
(object1angle, object1speed) = vectorsum((object1.angle, object1.speed*(object1.mass-object2.mass)/total_mass), (angle, 2*object2.speed*object2.mass/total_mass))
else:
'''''https://en.wikipedia.org/wiki/Elastic_collision'''''
CONTACT_ANGLE = angle
x = (((object1.speed * cos(object1.angle - CONTACT_ANGLE) * (object1.mass-object2.mass)+ 2*object2.mass*object2.speed*cos(object2.angle - CONTACT_ANGLE))/total_mass)*cos(CONTACT_ANGLE))+object1.speed*sin(object1.angle - CONTACT_ANGLE)*cos(CONTACT_ANGLE + 0.5 * pi)
y = (((object1.speed * cos(object1.angle - CONTACT_ANGLE) * (object1.mass-object2.mass)+ 2*object2.mass*object2.speed*cos(object2.angle - CONTACT_ANGLE))/total_mass)*cos(CONTACT_ANGLE))+object1.speed*sin(object1.angle - CONTACT_ANGLE)*sin(CONTACT_ANGLE + 0.5 * pi)
object1angle = pi/2 - atan2(y, x)
object1speed = hypot(x, y)
x = (((object2.speed * cos(object2.angle - CONTACT_ANGLE)*(object2.mass-object1.mass)+2*object1.mass*object1.speed*cos(object1.angle - CONTACT_ANGLE))/total_mass)*cos(CONTACT_ANGLE))+object2.speed*sin(object2.angle - CONTACT_ANGLE)*cos(CONTACT_ANGLE + 0.5 * pi)
y = (((object2.speed * cos(object2.angle - CONTACT_ANGLE)*(object2.mass-object1.mass)+2*object1.mass*object1.speed*cos(object1.angle - CONTACT_ANGLE))/total_mass)*cos(CONTACT_ANGLE))+object2.speed*sin(object2.angle - CONTACT_ANGLE)*sin(CONTACT_ANGLE + 0.5 * pi)
object2angle = pi/2 - atan2(y, x)
object2speed = hypot(x, y)
(object2.angle, object2.speed) = (object2angle, object2speed)
(object1.angle, object1.speed) = (object1angle, object1speed)
object1.speed *= 0.999
object2.speed *= 0.999
overlap = 0.5*(object1.radius + object2.radius - dist+1)
object1.x += sin(angle)*overlap
object1.y -= cos(angle)*overlap
object2.x -= sin(angle)*overlap
object2.y += cos(angle)*overlap
'''''http://www.petercollingridge.co.uk/pygame-physics-simulation/mass'''''
def vectorsum(vectorx, vectory): # Every array's first number is the degree from 0, the second is speed
x = sin(vectory[0]) * vectory[1] + sin(vectorx[0]) * vectorx[1]
y = cos(vectory[0]) * vectory[1] + cos(vectorx[0]) * vectorx[1] # Calculating new vectors from anle and lenght
angle = pi / 2 - atan2(y, x) # Calculating the degree
speed = hypot(x, y) # Calculating the speed
return angle, speed
(我只是Python(或英語)的初學者,所以請記住這一點。)
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