77 lines
2.6 KiB
Python
77 lines
2.6 KiB
Python
#!/usr/bin/env python
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from game import *
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class WaterSim(Game):
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alpha = 100000
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u = lambda Cm1,C,C1,dx: WaterSim.alpha * (Cm1+C1-2*C) * 0.5 * dx
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v = lambda u,v,d,dt: ( v + (u - d * v) * dt )
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w = lambda w,v,dt: w + v * dt
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def __init__(self,N):
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self.N = N
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self.init_data(N//2)
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self.mousepos = (0,0)
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super(WaterSim, self).__init__( 1000, 600, 120)
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def init_data(self, middle):
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self.C = [50] * self.N
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for i in range(middle - self.N//4,middle + self.N//4):
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if i < 0 or i >= self.N: continue
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self.C[i] += (1-math.cos(2 * math.pi * (i - middle + self.N//4) / (self.N//2))) * 100
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self.C1 = [0] * self.N
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def on_event(self, event):
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if event.type == MOUSEBUTTONDOWN and event.button == 1:
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self.init_data( self.N*event.pos[0] // self._width )
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elif event.type == MOUSEMOTION:
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self.mousepos = event.pos[:]
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else:
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super(WaterSim, self).on_event(event)
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def on_update(self, dtime):
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C2 = [0] * self.N
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C2[0] = WaterSim.u(self.C[1] , self.C[0] , self.C[1] , 1.0/self.N)
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C2[-1] = WaterSim.u(self.C[-2] , self.C[-1] , self.C[-2] , 1.0/self.N)
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#C2[0] = 100 * (self.C[1] - self.C[0]) * 100/self.N
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#C2[-1] = 100 * (self.C[-2] - self.C[-1]) * 100/self.N
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for i in range(1,self.N-1):
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C2[i] = WaterSim.u(self.C[i-1],self.C[i], self.C[i+1], 1.0/self.N)
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#C2[i] = 1000 * (self.C[i+1] + self.C[i-1] - 2*self.C[i]) * 0.5 * 100 /(self.N)
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for i in range(0,self.N):
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if i == 0 or i == self.N-1:
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d = 10
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#d = 0.95
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else:
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d = 0.1
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#d = 0.9999
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#self.C1[i] = d * (self.C1[i] + C2[i] * dtime)
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self.C1[i] = WaterSim.v(C2[i], self.C1[i], d, dtime)
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#self.C[i] = ( self.C[i] + self.C1[i] * dtime )
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self.C[i] = WaterSim.w(self.C[i], self.C1[i], dtime)
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if self.C[i] < 0:
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self.C[i] = 0
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n = self.mousepos[0] * self.N // self._width
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alpha = 0.05
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v = self._height - self.mousepos[1]
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if self.C[n] > v:
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self.C[n] = self.C[n]*(1-alpha) + alpha*v
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def on_render(self,srfc):
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BLACK = (0,0,0)
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BLUE = (100,100,255)
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srfc.fill(BLACK)
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prev_point = ( 0, self._height-int(self.C[0]) )
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for i in range(1,self.N):
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new_point = ( (i*self._width)//(self.N-1), self._height - int( self.C[i] ) )
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pygame.draw.line( srfc, BLUE, prev_point, new_point, 3 )
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prev_point = new_point
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if __name__ == '__main__':
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WaterSim(50).on_execute()
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