Learn to Program 25
In the final part of my TkInter tutorial I make a complete Python Paint app in one video. We’ll make a Python paint app, cover TkInter canvas, catching mouse events, and drawing with a pencil, lines, arcs, ovals, rectangles, text and much more.
If you missed my previous videos, here is the 1st Learn to Program video and the 1st TkInter tutorial.
If you think videos like this are pretty good consider donating a $1 on Patreon. It helps a lot!
Code & Cheat Sheet
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 |
from tkinter import * import tkinter.font class PaintApp: # Stores current drawing tool used drawing_tool = "line" # Tracks whether left mouse is down left_but = "up" # x and y positions for drawing with pencil x_pos, y_pos = None, None # Tracks x & y when the mouse is clicked and released x1_line_pt, y1_line_pt, x2_line_pt, y2_line_pt = None, None, None, None # ---------- CATCH MOUSE UP ---------- def left_but_down(self, event=None): self.left_but = "down" # Set x & y when mouse is clicked self.x1_line_pt = event.x self.y1_line_pt = event.y # ---------- CATCH MOUSE UP ---------- def left_but_up(self, event=None): self.left_but = "up" # Reset the line self.x_pos = None self.y_pos = None # Set x & y when mouse is released self.x2_line_pt = event.x self.y2_line_pt = event.y # If mouse is released and line tool is selected # draw the line if self.drawing_tool == "line": self.line_draw(event) elif self.drawing_tool == "arc": self.arc_draw(event) elif self.drawing_tool == "oval": self.oval_draw(event) elif self.drawing_tool == "rectangle": self.rectangle_draw(event) elif self.drawing_tool == "text": self.text_draw(event) # ---------- CATCH MOUSE MOVEMENT ---------- def motion(self, event=None): if self.drawing_tool == "pencil": self.pencil_draw(event) # ---------- DRAW PENCIL ---------- def pencil_draw(self, event=None): if self.left_but == "down": # Make sure x and y have a value if self.x_pos is not None and self.y_pos is not None: event.widget.create_line(self.x_pos, self.y_pos, event.x, event.y, smooth=TRUE) self.x_pos = event.x self.y_pos = event.y # ---------- DRAW LINE ---------- def line_draw(self, event=None): # Shortcut way to check if none of these values contain None if None not in (self.x1_line_pt, self.y1_line_pt, self.x2_line_pt, self.y2_line_pt): event.widget.create_line(self.x1_line_pt, self.y1_line_pt, self.x2_line_pt, self.y2_line_pt, smooth=TRUE, fill="green") # ---------- DRAW ARC ---------- def arc_draw(self, event=None): # Shortcut way to check if none of these values contain None if None not in (self.x1_line_pt, self.y1_line_pt, self.x2_line_pt, self.y2_line_pt): coords = self.x1_line_pt, self.y1_line_pt, self.x2_line_pt, self.y2_line_pt # start : starting angle for the slice in degrees # extent : width of the slice in degrees # fill : fill color if needed # style : can be ARC, PIESLICE, or CHORD event.widget.create_arc(coords, start=0, extent=150, style=ARC) # ---------- DRAW OVAL ---------- def oval_draw(self, event=None): if None not in (self.x1_line_pt, self.y1_line_pt, self.x2_line_pt, self.y2_line_pt): # fill : Color option names are here http://wiki.tcl.tk/37701 # outline : border color # width : width of border in pixels event.widget.create_oval(self.x1_line_pt, self.y1_line_pt, self.x2_line_pt, self.y2_line_pt, fill="midnight blue", outline="yellow", width=2) # ---------- DRAW RECTANGLE ---------- def rectangle_draw(self, event=None): if None not in (self.x1_line_pt, self.y1_line_pt, self.x2_line_pt, self.y2_line_pt): # fill : Color option names are here http://wiki.tcl.tk/37701 # outline : border color # width : width of border in pixels event.widget.create_rectangle(self.x1_line_pt, self.y1_line_pt, self.x2_line_pt, self.y2_line_pt, fill="midnight blue", outline="yellow", width=2) # ---------- DRAW TEXT ---------- def text_draw(self, event=None): if None not in (self.x1_line_pt, self.y1_line_pt): # Show all fonts available print(tkinter.font.families()) text_font = tkinter.font.Font(family='Helvetica', size=20, weight='bold', slant='italic') event.widget.create_text(self.x1_line_pt, self.y1_line_pt, fill="green", font=text_font, text="WOW") def __init__(self, root): drawing_area = Canvas(root) drawing_area.pack() drawing_area.bind("<Motion>", self.motion) drawing_area.bind("<ButtonPress-1>", self.left_but_down) drawing_area.bind("<ButtonRelease-1>", self.left_but_up) root = Tk() paint_app = PaintApp(root) root.mainloop() |
Leave a Reply