用鼠标移动和缩放tkintercanvas

这里是我想要的描述:在tkintercanvas中绘制几何对象(这里是矩形)的集合,并且可以使用鼠标来探索这个canvas。 点击并拖animation布,滚动放大并缩小。

使用这个主题,我发现了点击和拖动部分: 用鼠标和鼠标移动tkintercanvas

我设法写一些滚动缩放。 移动和缩放都能很好地工作。

问题 :如果我移动然后放大,缩放的焦点不再是光标的位置。

任何build议?

这里有一段代码来testing

[ 编辑 :现在应该适用于Linux和Windows]

import Tkinter as tk import random class Example(tk.Frame): def __init__(self, root): tk.Frame.__init__(self, root) self.canvas = tk.Canvas(self, width=400, height=400, background="bisque") self.xsb = tk.Scrollbar(self, orient="horizontal", command=self.canvas.xview) self.ysb = tk.Scrollbar(self, orient="vertical", command=self.canvas.yview) self.canvas.configure(yscrollcommand=self.ysb.set, xscrollcommand=self.xsb.set) self.canvas.configure(scrollregion=(0,0,1000,1000)) self.xsb.grid(row=1, column=0, sticky="ew") self.ysb.grid(row=0, column=1, sticky="ns") self.canvas.grid(row=0, column=0, sticky="nsew") self.grid_rowconfigure(0, weight=1) self.grid_columnconfigure(0, weight=1) #Plot some rectangles for n in range(50): x0 = random.randint(0, 900) y0 = random.randint(50, 900) x1 = x0 + random.randint(50, 100) y1 = y0 + random.randint(50,100) color = ("red", "orange", "yellow", "green", "blue")[random.randint(0,4)] self.canvas.create_rectangle(x0,y0,x1,y1, outline="black", fill=color, activefill="black", tags=n) self.canvas.create_text(50,10, anchor="nw", text="Click and drag to move the canvas\nScroll to zoom.") # This is what enables using the mouse: self.canvas.bind("<ButtonPress-1>", self.move_start) self.canvas.bind("<B1-Motion>", self.move_move) #linux scroll self.canvas.bind("<Button-4>", self.zoomerP) self.canvas.bind("<Button-5>", self.zoomerM) #windows scroll self.canvas.bind("<MouseWheel>",self.zoomer) #move def move_start(self, event): self.canvas.scan_mark(event.x, event.y) def move_move(self, event): self.canvas.scan_dragto(event.x, event.y, gain=1) #windows zoom def zoomer(self,event): if (event.delta > 0): self.canvas.scale("all", event.x, event.y, 1.1, 1.1) elif (event.delta < 0): self.canvas.scale("all", event.x, event.y, 0.9, 0.9) self.canvas.configure(scrollregion = self.canvas.bbox("all")) #linux zoom def zoomerP(self,event): self.canvas.scale("all", event.x, event.y, 1.1, 1.1) self.canvas.configure(scrollregion = self.canvas.bbox("all")) def zoomerM(self,event): self.canvas.scale("all", event.x, event.y, 0.9, 0.9) self.canvas.configure(scrollregion = self.canvas.bbox("all")) if __name__ == "__main__": root = tk.Tk() Example(root).pack(fill="both", expand=True) root.mainloop() 

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