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A simple paint application using tkinter in Python 3
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| from tkinter import * | |
| from tkinter.colorchooser import askcolor | |
| class Paint(object): | |
| DEFAULT_PEN_SIZE = 5.0 | |
| DEFAULT_COLOR = 'black' | |
| def __init__(self): | |
| self.root = Tk() | |
| self.pen_button = Button(self.root, text='pen', command=self.use_pen) | |
| self.pen_button.grid(row=0, column=0) | |
| self.brush_button = Button(self.root, text='brush', command=self.use_brush) | |
| self.brush_button.grid(row=0, column=1) | |
| self.color_button = Button(self.root, text='color', command=self.choose_color) | |
| self.color_button.grid(row=0, column=2) | |
| self.eraser_button = Button(self.root, text='eraser', command=self.use_eraser) | |
| self.eraser_button.grid(row=0, column=3) | |
| self.choose_size_button = Scale(self.root, from_=1, to=10, orient=HORIZONTAL) | |
| self.choose_size_button.grid(row=0, column=4) | |
| self.c = Canvas(self.root, bg='white', width=600, height=600) | |
| self.c.grid(row=1, columnspan=5) | |
| self.setup() | |
| self.root.mainloop() | |
| def setup(self): | |
| self.old_x = None | |
| self.old_y = None | |
| self.line_width = self.choose_size_button.get() | |
| self.color = self.DEFAULT_COLOR | |
| self.eraser_on = False | |
| self.active_button = self.pen_button | |
| self.c.bind('<B1-Motion>', self.paint) | |
| self.c.bind('<ButtonRelease-1>', self.reset) | |
| def use_pen(self): | |
| self.activate_button(self.pen_button) | |
| def use_brush(self): | |
| self.activate_button(self.brush_button) | |
| def choose_color(self): | |
| self.eraser_on = False | |
| self.color = askcolor(color=self.color)[1] | |
| def use_eraser(self): | |
| self.activate_button(self.eraser_button, eraser_mode=True) | |
| def activate_button(self, some_button, eraser_mode=False): | |
| self.active_button.config(relief=RAISED) | |
| some_button.config(relief=SUNKEN) | |
| self.active_button = some_button | |
| self.eraser_on = eraser_mode | |
| def paint(self, event): | |
| self.line_width = self.choose_size_button.get() | |
| paint_color = 'white' if self.eraser_on else self.color | |
| if self.old_x and self.old_y: | |
| self.c.create_line(self.old_x, self.old_y, event.x, event.y, | |
| width=self.line_width, fill=paint_color, | |
| capstyle=ROUND, smooth=TRUE, splinesteps=36) | |
| self.old_x = event.x | |
| self.old_y = event.y | |
| def reset(self, event): | |
| self.old_x, self.old_y = None, None | |
| if __name__ == '__main__': | |
| Paint() |
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