87 lines
2.9 KiB
Python
87 lines
2.9 KiB
Python
import matplotlib.pyplot as plt
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import numpy as np
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import sys
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class Plot:
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def __init__(self, n):
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self.fig, self.ax = plt.subplots()
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# Obsługa kliknięć myszą
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self.cid_click = self.fig.canvas.mpl_connect('button_press_event', self.onclick)
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self.cid_motion = self.fig.canvas.mpl_connect('motion_notify_event', self.on_mouse_move)
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self.cid_release = self.fig.canvas.mpl_connect('button_release_event', self.on_release)
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# Ustawienia wykresu
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plt.xlim(0, 800)
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plt.ylim(0, 600)
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plt.grid()
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self.line = [] # linia rysowana przez użytkownika
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self.controlPoints = [] # Punkty kontrolne krzywej Béziera
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self.curvePoints = []
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self.isDrawing = False # Flaga rysowania
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self.inputMode = 0 # Tryb wejścia: 0 - rysowanie linii, 1 - dodawanie punktów kontrolnych
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self.n = n
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def onclick(self, event):
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# Tryb rysowania linii
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if self.inputMode == 0:
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self.isDrawing = True
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# Tryb dodawania punktów kontrolnych
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elif self.inputMode == 1 and len(self.controlPoints) < self.n:
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self.controlPoints.append((event.xdata, event.ydata))
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self.drawPlot()
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def on_mouse_move(self, event):
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if self.isDrawing:
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self.line.append((event.xdata, event.ydata))
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self.drawPlot()
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def on_release(self, event):
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# Zakończ rysowanie linii
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if self.inputMode == 0:
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self.isDrawing = False
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self.inputMode = 1
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def drawPlot(self):
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self.ax.clear()
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# Rysowanie linii narysowanej przez użytkownika
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if len(self.line) > 1:
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self.ax.plot(*zip(*self.line), color='red', label='linia')
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# Rysowanie punktów kontrolnych
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if len(self.controlPoints) > 0:
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self.ax.scatter(*zip(*self.controlPoints), color='black', label='Punkty kontrolne')
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# Rysowanie krzywej Béziera
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if len(self.controlPoints) >= self.n:
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t_values = np.linspace(0, 1, num=100)
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bezier_points = np.array([self.de_casteljau(t) for t in t_values])
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self.ax.plot(bezier_points[:, 0], bezier_points[:, 1], color='blue', label='Krzywa Béziera')
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self.ax.legend()
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self.ax.set_xlim(0, 800)
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self.ax.set_ylim(0, 600)
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self.ax.grid()
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plt.draw()
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def de_casteljau(self, t):
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"""Oblicza punkt na krzywej Béziera za pomocą algorytmu de Casteljau dla danego t."""
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points = np.array(self.controlPoints)
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n = len(points)
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for r in range(1, n):
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for i in range(n - r):
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points[i] = (1 - t) * points[i] + t * points[i + 1]
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return points[0]
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def run(self):
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plt.show()
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n = 10
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if len(sys.argv) > 1:
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n = int(sys.argv[1])
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if __name__ == "__main__":
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plot = Plot(n + 1)
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plot.run()
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