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- import tkinter as tk
- import time, math
- from PIL import Image, ImageDraw, ImageTk
- class Graph(tk.Canvas):
- def __init__(self, root, scale=(-100, 500), **kwargs):
- self.root = root
- tk.Canvas.__init__(self, root, **kwargs)
- self.height = self.winfo_reqheight()
- self.width = self.winfo_reqwidth()
- self.lastPoints = [(0, 0)] * 3
- self.scale = scale
- self.colors = [(100, 255, 100, 255), (255, 100, 100, 255) ,(100, 100, 255, 255)]
-
- self.drawBackground()
- self.canvas = self.bg.copy()
- self.image = self.create_image(0, 0, image=None, anchor='nw')
- self.bind("<Configure>", self.on_resize)
- def drawBackground(self):
- self.bg = Image.new('RGB', (self.width, self.height), (0,20,0))
- draw = ImageDraw.Draw(self.bg)
- draw.line([(0, self.height/2), (self.width, self.height/2)], (0,127,127), 1)
- draw.line([(self.width/2, 0), (self.width/2, self.height)], (0,127,127), 1)
- def on_resize(self,event):
- # determine the ratio of old width/height to new width/height
- self.width = max(400, event.width-4)
- self.height = max(400, event.height-4)
- # resize the canvas
- self.config(width=self.width, height=self.height)
- self.canvas = self.canvas.resize((self.width, self.height))
- self.drawBackground()
- self.canvas = Image.blend(self.canvas, self.bg, 0.1)
- def pointToCoord(self, point):
- return ((point[0] - self.scale[0]) / (self.scale[1]-self.scale[0]) * self.width,
- self.height - (point[1] - self.scale[0]) / (self.scale[1]-self.scale[0]) * self.height - 1)
- def update(self, data):
- coord = [[self.pointToCoord(p)] for p in self.lastPoints]
- for i in range(len(data)):
- for point in data[i]:
- coord[i].append(self.pointToCoord(point))
- self.lastPoints = [line[-1] for line in data]
- self.canvas = Image.blend(self.canvas, self.bg, 1/200)
- draw = ImageDraw.Draw(self.canvas)
- for i in range(len(coord)):
- draw.line(coord[i], fill=self.colors[i], width=int(self.height/100), joint='curve')
- self.photo = ImageTk.PhotoImage(self.canvas)
- self.itemconfig(self.image, image=self.photo)
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