fisheye.py 文件源码

def update_preview(self, psize):
        # Safety check: Ignore calls during construction/destruction.
        if not self.init_done: return
        # Copy latest user settings to the lens object.
        self.lens.fov_deg = self.f.get()
        self.lens.radius_px = self.r.get()
        self.lens.center_px[0] = self.x.get()
        self.lens.center_px[1] = self.y.get()
        # Re-scale the image to match the canvas size.
        # Note: Make a copy first, because thumbnail() operates in-place.
        self.img_sc = self.img.copy()
        self.img_sc.thumbnail(psize, Image.NEAREST)
        self.img_tk = ImageTk.PhotoImage(self.img_sc)
        # Re-scale the x/y/r parameters to match the preview scale.
        pre_scale = float(psize[0]) / float(self.img.size[0])
        x = self.x.get() * pre_scale
        y = self.y.get() * pre_scale
        r = self.r.get() * pre_scale
        # Clear and redraw the canvas.
        self.preview.delete('all')
        self.preview.create_image(0, 0, anchor=tk.NW, image=self.img_tk)
        self.preview.create_oval(x-r, y-r, x+r, y+r,
                                 outline='#C00000', width=3)

    # Make a combined label/textbox/slider for a given variable: