init

.gitignore

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+*.gif
+/venv

First_Cube/First_Cube.py

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+# coding:utf-8
+
+from tkinter import Tk,Canvas
+import math,threading,time
+
+class TkCube(object):
+    def __init__(self):
+        self.points = [[-1,1,-1],  # LeftFrontDown
+                       [1,1,-1],   # RFD
+                       [-1,-1,-1], # LBD
+                       [1,-1,-1],  # RBD
+                       [-1,1,1],   # LFU
+                       [1,1,1],    # RFU
+                       [-1,-1,1],  # LBU
+                       [1,-1,1]]   # RBU
+        self.pit   = [[0,0],[0,0],[0,0],[0,0],[0,0],[0,0],[0,0],[0,0]] # point in 2d
+        self.angle = 0
+        self.speed = 1 # π/s
+        self.fps   = 60
+        self.dist  = [5,4] # distance between the cube's center and focal point/canvas
+        self.st    = 1/self.fps # sleep time
+        self.apf   = math.pi * self.speed / self.fps # angle per frame
+        # init canvas
+        self.tkroot = Tk()
+        self.cvs = [Canvas(self.tkroot,bg='white',width=800,height=600),Canvas(self.tkroot,bg='white',width=800,height=600)]
+        self.cvs[0].pack()
+        self.showingCv = 0
+        self.hiddenCv  = 1
+    def rotate(self):
+        self.angle += self.apf
+        if self.angle > 2*math.pi:
+            self.angle -= 2*math.pi
+        radius = math.sqrt(2) # 点旋转的半径
+        for pair in [[0,4,-math.pi/4],
+                     [1,5,math.pi/4],
+                     [2,6,math.pi*3/4],
+                     [3,7,-math.pi*3/4]]: # rotate in pairs
+            center = [radius*math.sin(self.angle+pair[2]),radius*math.cos(self.angle+pair[2])]
+            # x
+            self.points[pair[0]][0] = center[0]
+            self.points[pair[1]][0] = center[0]
+            # y
+            self.points[pair[0]][1] = center[1]
+            self.points[pair[1]][1] = center[1]
+    def draw(self):
+        # project points into 2D canvas 投影到2D
+        for pt in range(8):
+            rate = self.dist[1]/(self.dist[0]+self.points[pt][1])
+            scale = 200
+            self.pit[pt][0] = self.points[pt][0]*rate*scale
+            self.pit[pt][1] = self.points[pt][2]*rate*scale
+        self.cvs[self.hiddenCv].delete('all')
+        # for dcp,nps in [[1,[0,3,5]], # drawing central point:以1,2,4,7四个点为中心,分别连接相邻的三个点即可绘成正方体
+        #             [2,[0,3,6]],
+        #             [4,[0,5,6]],
+        #             [7,[3,5,6]]]:
+        # 不知道为什么上面的画不出正确的正方体,底面是对角线不是楞┑(￣Д ￣)┍
+        for dcp,nps in [[1,[0,2,5]], # drawing central point:以1,2,4,7四个点为中心,分别连接相邻的三个点即可绘成正方体
+                        [2,[1,3,6]],
+                        [0,[3]],
+                        [4,[0,5,7]],
+                        [7,[3,4,6]],
+                        [6,[5]]]:
+            for np in nps: # nearby point
+                self.cvs[self.hiddenCv].create_line(self.pit[dcp][0]+400,self.pit[dcp][1]+300,self.pit[np][0]+400,self.pit[np][1]+300) # 因为坐标原点在左上角,让x和y分别加400和300让画面在窗口中心
+        # 切换canvas
+        self.cvs[self.showingCv].pack_forget()
+        self.cvs[self.hiddenCv].pack()
+        self.showingCv,self.hiddenCv = self.hiddenCv,self.showingCv
+    def run(self):
+        while True:
+            # self.rotateThread = threading.Thread(target=self.rotate)
+            # self.rotateThread.run()
+            # self.drawThread = threading.Thread(target=self.draw)
+            # self.drawThread.run()
+            self.rotate()
+            self.draw()
+            # print(self.points)
+            time.sleep(self.st)
+    def start(self):
+        self.runThread = threading.Thread(target=self.run)
+        self.runThread.start()
+        self.tkroot.mainloop()
+
+if __name__ == '__main__':
+    tc = TkCube()
+    tc.start()

README.md

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+# PlayWith3D
+A project about [my](cx@kdxcxs.com) 3D exploring journey