from kivy.app import App
from kivy.graphics import Line
from kivy.metrics import dp
from kivy.properties import NumericProperty
from kivy.uix.widget import Widget
class Galaxy(Widget):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.n_vlines = 11
self.n_hlines = 9
self.space_vlines = dp(100)
with self.canvas:
self.vlines = []
self.hlines = []
for i in range(self.n_vlines):
vline = Line(points=(0,0,0,100))
self.vlines.append(vline)
for j in range(self.n_hlines):
hline = Line(points=(0,0,100,0))
self.hlines.append(hline)
def on_size(self, *args):
start_x = self.center_x - int(self.n_vlines/2)*self.space_vlines
for i in range(self.n_vlines):
x = start_x+self.space_vlines*i
x1, y1, x2, y2 = x, 0, x, self.height
x1, y1 = self.perspective_transform(x1, y1)
x2, y2 = self.perspective_transform(x2, y2)
self.vlines[i].points = (x1, y1, x2, y2)
space_hlines = self.height / self.n_hlines
for j in range(self.n_hlines):
y = j * space_hlines
x1, y1, x2, y2 = start_x, y, self.width-start_x, y
_, y1 = self.perspective_transform(x1, y1)
x1, _ = self.perspective_transform(x1, y1/0.8)
_, y2 = self.perspective_transform(x2, y2)
x2, _ = self.perspective_transform(x2, y2/0.8)
self.hlines[j].points = (x1, y1, x2, y2)
def perspective_transform(self, x, y):
#return x, y
ratio = (self.height-y)/self.height
tx = ratio*(self.center_x-x)
ty = ratio**2
return self.center_x-tx, 0.8*self.height*(1-ty)
class GalaxyApp(App):
pass
GalaxyApp().run()
reference:
No comments:
Post a Comment