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| 1 | +# importing libraries |
| 2 | +from PyQt5.QtWidgets import * |
| 3 | +from PyQt5.QtGui import * |
| 4 | +from PyQt5.QtCore import * |
| 5 | +import sys |
| 6 | + |
| 7 | +# window class |
| 8 | +class Window(QMainWindow): |
| 9 | + def __init__(self): |
| 10 | + super().__init__() |
| 11 | + |
| 12 | + # setting application window up |
| 13 | + self.setWindowTitle("Paint with PyQt5") |
| 14 | + self.setGeometry(100, 100, 800, 600) |
| 15 | + |
| 16 | + # setting up image object |
| 17 | + self.image = QImage(self.size(), QImage.Format_RGB32) |
| 18 | + self.image.fill(Qt.white) |
| 19 | + |
| 20 | + # variables |
| 21 | + # drawing flag - shows if currently drawing |
| 22 | + self.drawing = False |
| 23 | + self.brushSize = 2 |
| 24 | + self.brushColor = Qt.black |
| 25 | + # QPoint object to track the point of cursor release |
| 26 | + self.lastPoint = QPoint() |
| 27 | + |
| 28 | + # creating menu bar |
| 29 | + mainMenu = self.menuBar() |
| 30 | + fileMenu = mainMenu.addMenu("File") |
| 31 | + b_size = mainMenu.addMenu("Brush Size") |
| 32 | + b_color = mainMenu.addMenu("Brush Color") |
| 33 | + |
| 34 | + # creating save action |
| 35 | + saveAction = QAction("Save", self) |
| 36 | + saveAction.setShortcut("Ctrl + S") |
| 37 | + fileMenu.addAction(saveAction) |
| 38 | + saveAction.triggered.connect(self.save) |
| 39 | + |
| 40 | + # creating clear action |
| 41 | + clearAction = QAction("Clear", self) |
| 42 | + clearAction.setShortcut("Ctrl + C") |
| 43 | + fileMenu.addAction(clearAction) |
| 44 | + clearAction.triggered.connect(self.clear) |
| 45 | + |
| 46 | + # creating options for brush sizes |
| 47 | + pix_4 = QAction("4px", self) |
| 48 | + b_size.addAction(pix_4) |
| 49 | + pix_4.triggered.connect(self.Pixel_4) |
| 50 | + |
| 51 | + pix_7 = QAction("7px", self) |
| 52 | + b_size.addAction(pix_7) |
| 53 | + pix_7.triggered.connect(self.Pixel_7) |
| 54 | + |
| 55 | + pix_9 = QAction("9px", self) |
| 56 | + b_size.addAction(pix_9) |
| 57 | + pix_9.triggered.connect(self.Pixel_9) |
| 58 | + |
| 59 | + pix_12 = QAction("12px", self) |
| 60 | + b_size.addAction(pix_12) |
| 61 | + pix_12.triggered.connect(self.Pixel_12) |
| 62 | + |
| 63 | + # creating options for brush color |
| 64 | + black = QAction("Black", self) |
| 65 | + b_color.addAction(black) |
| 66 | + black.triggered.connect(self.blackColor) |
| 67 | + |
| 68 | + white = QAction("White", self) |
| 69 | + b_color.addAction(white) |
| 70 | + white.triggered.connect(self.whiteColor) |
| 71 | + |
| 72 | + green = QAction("Green", self) |
| 73 | + b_color.addAction(green) |
| 74 | + green.triggered.connect(self.greenColor) |
| 75 | + |
| 76 | + yellow = QAction("Yellow", self) |
| 77 | + b_color.addAction(yellow) |
| 78 | + yellow.triggered.connect(self.yellowColor) |
| 79 | + |
| 80 | + red = QAction("Red", self) |
| 81 | + b_color.addAction(red) |
| 82 | + red.triggered.connect(self.redColor) |
| 83 | + |
| 84 | + |
| 85 | + # method for checking mouse clicks |
| 86 | + def mousePressEvent(self, event): |
| 87 | + |
| 88 | + # if left mouse button is pressed |
| 89 | + if event.button() == Qt.LeftButton: |
| 90 | + # set drawing flag true |
| 91 | + self.drawing = True |
| 92 | + # set last point to the point of cursor |
| 93 | + self.lastPoint = event.pos() |
| 94 | + |
| 95 | + # method for tracking mouse activity (enables drawing) |
| 96 | + def mouseMoveEvent(self, event): |
| 97 | + |
| 98 | + # checking if left button is pressed and drawing flag is true |
| 99 | + if (event.buttons() & Qt.LeftButton) & self.drawing: |
| 100 | + |
| 101 | + # creating painter object |
| 102 | + painter = QPainter(self.image) |
| 103 | + # set the pen of the painter |
| 104 | + painter.setPen(QPen(self.brushColor, self.brushSize, |
| 105 | + Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin)) |
| 106 | + # draw line from the last point of cursor to the current point |
| 107 | + painter.drawLine(self.lastPoint, event.pos()) |
| 108 | + self.lastPoint = event.pos() |
| 109 | + self.update() |
| 110 | + |
| 111 | + # method for mouse left button release |
| 112 | + def mouseReleaseEvent(self, event): |
| 113 | + |
| 114 | + if event.button() == Qt.LeftButton: |
| 115 | + # make drawing flag false |
| 116 | + self.drawing = False |
| 117 | + |
| 118 | + # paint event |
| 119 | + def paintEvent(self, event): |
| 120 | + # create a canvas |
| 121 | + canvasPainter = QPainter(self) |
| 122 | + canvasPainter.drawImage(self.rect(), self.image, self.image.rect()) |
| 123 | + |
| 124 | + # method for saving canvas |
| 125 | + def save(self): |
| 126 | + filePath, _ = QFileDialog.getSaveFileName(self, "Save Image", "", |
| 127 | + "PNG(*.png);;JPEG(*.jpg *.jpeg);;All Files(*.*) ") |
| 128 | + if filePath == "": |
| 129 | + return |
| 130 | + self.image.save(filePath) |
| 131 | + |
| 132 | + # method for clearing canvas |
| 133 | + def clear(self): |
| 134 | + # make the whole canvas white |
| 135 | + self.image.fill(Qt.white) |
| 136 | + self.update() |
| 137 | + |
| 138 | + # methods for changing pixel sizes |
| 139 | + def Pixel_4(self): |
| 140 | + self.brushSize = 4 |
| 141 | + |
| 142 | + def Pixel_7(self): |
| 143 | + self.brushSize = 7 |
| 144 | + |
| 145 | + def Pixel_9(self): |
| 146 | + self.brushSize = 9 |
| 147 | + |
| 148 | + def Pixel_12(self): |
| 149 | + self.brushSize = 12 |
| 150 | + |
| 151 | + # methods for changing brush color |
| 152 | + def blackColor(self): |
| 153 | + self.brushColor = Qt.black |
| 154 | + |
| 155 | + def whiteColor(self): |
| 156 | + self.brushColor = Qt.white |
| 157 | + |
| 158 | + def greenColor(self): |
| 159 | + self.brushColor = Qt.green |
| 160 | + |
| 161 | + def yellowColor(self): |
| 162 | + self.brushColor = Qt.yellow |
| 163 | + |
| 164 | + def redColor(self): |
| 165 | + self.brushColor = Qt.red |
| 166 | + |
| 167 | + |
| 168 | + |
| 169 | +# create pyqt5 app |
| 170 | +App = QApplication(sys.argv) |
| 171 | + |
| 172 | +# create the instance of our Window |
| 173 | +window = Window() |
| 174 | +window.show() |
| 175 | + |
| 176 | +# start the app |
| 177 | +sys.exit(App.exec()) |
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