我正在尝试制作一个程序，仅在屏幕的半个按钮上绘制，但是正如您所看到的，绘画向底部移动，如果我在上部绘制，则绘画发生在下部。我想要的是直接在底部绘制。这是我的代码：from PIL.ImageEnhance import Colorfrom PyQt5.QtWidgets import QMainWindow, QApplication, QMenu, QMenuBar, QAction, QFileDialog, QTextEdit, QVBoxLayout, \ QWidget, QLabelfrom PyQt5.QtGui import QIcon, QImage, QPainter, QPen, QBrush, QPixmapfrom PyQt5.QtCore import Qt, QPoint, QSize, QRectimport sysimport pyautoguiclass Window(QMainWindow): def __init__(self): super().__init__() title = "Digital Waraq" icon = "icons/pain.png" [x, y] = pyautogui.size() self.setWindowTitle(title) self.setGeometry(0, 0, x, y) self.setWindowIcon(QIcon(icon)) self.image = QImage(pyautogui.size().width, int(pyautogui.size().height/2), QImage.Format_RGB32) self.image.fill(Qt.gray) self.drawing = False self.brushSize = 2 self.brushColor = Qt.black self.lastPoint = QPoint() def mousePressEvent(self, event): if event.button() == Qt.LeftButton: self.drawing = True self.lastPoint = event.pos() #print(self.lastPoint) def mouseMoveEvent(self, event): if(event.buttons() & Qt.LeftButton) & self.drawing: painter = QPainter(self.image) painter.setPen(QPen(self.brushColor, self.brushSize, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin)) painter.drawLine(self.lastPoint, event.pos()) self.lastPoint = event.pos() self.update() def mouseReleaseEvent(self, event): if event.button() == Qt.LeftButton: self.drawing = False def paintEvent(self, event): canvasPainter = QPainter(self) #canvasPainter.drawImage(self.rect(), self.image, self.image.rect()) newRect = QRect(QPoint(0, int(pyautogui.size().height/2)), QSize(self.image.size())) #canvasPainter.drawImage(newRect, self.image, self.image.rect()) canvasPainter.drawImage(newRect, self.image, self.image.rect())
1 回答
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TA贡献1802条经验 获得超5个赞
不要使在小部件内划分绘画区域的任务复杂化，更简单的解决方案是创建一个完全完成绘画的小部件，然后将其放置在主窗口的底部。
import sys
from PyQt5.QtCore import QPoint, Qt
from PyQt5.QtGui import QBrush, QGuiApplication, QImage, QPainter, QPen
from PyQt5.QtWidgets import QApplication, QMainWindow, QVBoxLayout, QWidget
class Drawer(QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self._drawing = False
self.last_point = QPoint()
self._image_layer = QImage(self.size(), QImage.Format_RGB32)
self._image_layer.fill(Qt.gray)
self.brushSize = 2
self.brushColor = Qt.black
def mousePressEvent(self, event):
self._drawing = True
self.last_point = event.pos()
def mouseMoveEvent(self, event):
if self._drawing and event.buttons() & Qt.LeftButton:
painter = QPainter(self._image_layer)
painter.setPen(
QPen(
self.brushColor,
self.brushSize,
Qt.SolidLine,
Qt.RoundCap,
Qt.RoundJoin,
)
)
painter.drawLine(self.last_point, event.pos())
self.last_point = event.pos()
self.update()
def mouseReleaseEvent(self, event):
self._drawing = True
def paintEvent(self, event):
painter = QPainter(self)
painter.drawImage(QPoint(), self._image_layer)
painter.end()
def resizeEvent(self, event):
if (
self.size().width() > self._image_layer.width()
or self.size().height() > self._image_layer.height()
):
qimg = QImage(
max(self.size().width(), self._image_layer.width()),
max(self.size().height(), self._image_layer.height()),
QImage.Format_RGB32,
)
qimg.fill(Qt.gray)
painter = QPainter(qimg)
painter.drawImage(QPoint(), self._image_layer)
painter.end()
self._image_layer = qimg
self.update()
class Window(QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.drawer = Drawer()
central_widget = QWidget()
self.setCentralWidget(central_widget)
vlay = QVBoxLayout(central_widget)
vlay.setContentsMargins(0, 0, 0, 0)
vlay.addStretch(1)
vlay.addWidget(self.drawer, stretch=1)
r = QGuiApplication.primaryScreen().availableGeometry()
self.setGeometry(r)
if __name__ == "__main__":
app = QApplication(sys.argv)
window = Window()
window.show()
sys.exit(app.exec())
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