03_image_and_mouse.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Drawing on Images with Mouse"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "### LEFT MOUSE BUTTON EVENT ###\n",
    "\n",
    "import cv2\n",
    "import numpy as np \n",
    "\n",
    "################\n",
    "### FUNCTION ###\n",
    "################\n",
    "\n",
    "#Callback Function\n",
    "def draw_circle(event,x,y,flags,param): #parameters will be filled by setMouseCallback\n",
    "     \n",
    "        if event == cv2.EVENT_LBUTTONDOWN:\n",
    "            cv2.circle(img,(x,y),radius=10,color=(255,0,0),thickness=-1) #COLOR: BGR\n",
    "\n",
    "            \n",
    "\n",
    "# CONNECT THE IMAGE with namedWindow.\n",
    "# The function namedWindow creates a window that can be used as- \n",
    "# -a placeholder for images and trackbars.\n",
    "cv2.namedWindow(winname='my_drawing')\n",
    "\n",
    "# Set the Mouse Callback   \n",
    "cv2.setMouseCallback('my_drawing',draw_circle) # (Image WindowName,Callback Function)\n",
    "\n",
    "\n",
    "\n",
    "##################################\n",
    "### Showing Images With OpenCV ###\n",
    "##################################\n",
    "\n",
    "img = np.zeros((512,512,3))\n",
    "\n",
    "while True:\n",
    "    \n",
    "    #show window & image\n",
    "    cv2.imshow('my_drawing',img) #my_drawing (don't put any spaces on window name) \n",
    "    \n",
    "    ##If We have waited 20ms & Pressed the Esc\n",
    "    if cv2.waitKey(20) & 0xFF == 27:\n",
    "        break \n",
    "        \n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "### LEFT & RIGHT MOUSE BUTTON EVENT ###\n",
    "\n",
    "import cv2\n",
    "import numpy as np \n",
    "\n",
    "################\n",
    "### FUNCTION ###\n",
    "################\n",
    "\n",
    "#Callback Function\n",
    "def draw_circle(event,x,y,flags,param): #parameters will be filled by setMouseCallback\n",
    "     \n",
    "        if event == cv2.EVENT_LBUTTONDOWN:\n",
    "            cv2.circle(img,(x,y),radius=10,color=(255,0,0),thickness=-1) #COLOR: BGR\n",
    "        elif event == cv2.EVENT_RBUTTONDOWN:\n",
    "            cv2.circle(img,(x,y),radius=10,color=(0,0,255),thickness=-1)\n",
    "\n",
    "# CONNECT THE IMAGE with namedWindow.\n",
    "# The function namedWindow creates a window that can be used as- \n",
    "# -a placeholder for images and trackbars.\n",
    "cv2.namedWindow(winname='my_drawing')\n",
    "\n",
    "# Set the Mouse Callback   \n",
    "cv2.setMouseCallback('my_drawing',draw_circle) # (Image WindowName,Callback Function)\n",
    "\n",
    "\n",
    "\n",
    "##################################\n",
    "### Showing Images With OpenCV ###\n",
    "##################################\n",
    "\n",
    "img = np.zeros((512,512,3))\n",
    "\n",
    "while True:\n",
    "    \n",
    "    #show window & image\n",
    "    cv2.imshow('my_drawing',img) #my_drawing (don't put any spaces on window name) \n",
    "    \n",
    "    ##If We have waited 20ms & Pressed the Esc\n",
    "    if cv2.waitKey(20) & 0xFF == 27:\n",
    "        break \n",
    "        \n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "### DRAW RACTANGLE WITH MOUSE ### \n",
    "\n",
    "import cv2 \n",
    "import numpy as np\n",
    "\n",
    "###############\n",
    "## VARIABLES ##\n",
    "###############\n",
    "# true while mouse button down,false while mouse button up.\n",
    "drawing = False\n",
    "ix = -1\n",
    "iy = -1\n",
    "\n",
    "\n",
    "##############\n",
    "## FUNCTION ##\n",
    "##############\n",
    "def draw_rectangle(event,x,y,flags,params): #parameters will be filled by setMouseCallback\n",
    "    \n",
    "    global drawing,ix,iy\n",
    "    \n",
    "    if event == cv2.EVENT_LBUTTONDOWN:\n",
    "        \n",
    "        drawing = True\n",
    "        ix,iy = x,y  \n",
    "        \n",
    "    elif event == cv2.EVENT_MOUSEMOVE:\n",
    "        if drawing == True:\n",
    "            cv2.rectangle(img,(ix,iy),(x,y),(0,255,0),-1) # starting (ix,iy) ending (x,y)\n",
    "        \n",
    "    elif event == cv2.EVENT_LBUTTONUP:\n",
    "        drawing = False\n",
    "        cv2.rectangle(img,(ix,iy),(x,y),(0,255,0),-1)\n",
    "        \n",
    "        \n",
    "#######################           \n",
    "## SHOWING THE IMAGE ##\n",
    "#######################\n",
    "# black\n",
    "img = np.zeros((512,512,3))\n",
    "\n",
    "# The function namedWindow creates a window that can be used as- \n",
    "# -a placeholder for images and trackbars.\n",
    "cv2.namedWindow(winname='my_drawing')\n",
    "\n",
    "cv2.setMouseCallback('my_drawing',draw_rectangle)  # (Image WindowName,Callback Function)\n",
    "\n",
    "while True:\n",
    "    \n",
    "    #show window & image\n",
    "    cv2.imshow('my_drawing',img) #my_drawing (don't put any spaces on window name)\n",
    "    \n",
    "    if cv2.waitKey(1) & 0xFF == 27:\n",
    "        break \n",
    "\n",
    "cv2.destroyAllWindows()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
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