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Konstantin
Asked:2022-09-09 03:34:46 +0800 CST2022-09-09 03:34:46 +0800 CST

渐变线

  • 772

是否可以绘制一个不单调但带有渐变的 QPolygon。我的代码：

from PyQt5.QtWidgets import QApplication, QMainWindow
import sys
from PyQt5.QtGui import QPen,QPainter, QPolygon, QRadialGradient, QBrush, QColor
from PyQt5.QtCore import QPoint, Qt


class Window(QMainWindow):
    def __init__(self):
        super().__init__()
        self.title = "PyQt5 Drawing Polygon"
        self.width = 900
        self.height = 900
        self.InitWindow()

    def InitWindow(self):
        self.setWindowTitle(self.title)
        self.setGeometry(0,0, self.width, self.height)
        self.show()

    def paintEvent(self, event):
        painter = QPainter(self)
        gradient = QRadialGradient(50, 50, 50, 50, 50)
        gradient.setColorAt(0, QColor.fromRgbF(100, 125, 0, 0.5))
        gradient.setColorAt(1, QColor.fromRgbF(0, 255, 0, 0.5))
        brush = QBrush(gradient)
        pen = QPen(brush, 50, Qt.SolidLine)
        pen.setJoinStyle(Qt.RoundJoin)
        pen.setCapStyle(Qt.RoundCap)
        painter.setPen(pen)

        points = QPolygon([
            QPoint(80,80),
            QPoint(80,500),
            QPoint(500,80),
            QPoint(500,500)
        ])

        painter.drawPolyline(points)

App = QApplication(sys.argv)
window = Window()
sys.exit(App.exec())

所需结果的示例（如果可能的话......）：

绘制 =)

pyqt5

1 个回答

  1. Best Answer

    我没有想到比通过循环绘制所有内容更好的方法，只是使用大量 QPen 并进行最小的颜色变化，这样过渡就不会可见，而且看起来像渐变。

    from PyQt5.QtWidgets import QApplication, QMainWindow
import sys
from PyQt5.QtGui import QPen, QPainter, QPolygon, QRadialGradient, QBrush, QColor
from PyQt5.QtCore import QPoint, Qt


class Window(QMainWindow):
    def __init__(self):
        super().__init__()
        self.title = "PyQt5 Drawing Polygon"
        self.width = 900
        self.height = 900
        self.InitWindow()

        self.points = QPolygon([
            QPoint(80, 80),
            QPoint(80, 500),
            QPoint(500, 80),
            QPoint(500, 500)
        ])

    def InitWindow(self):
        self.setWindowTitle(self.title)
        self.setGeometry(0, 0, self.width, self.height)
        self.show()

    def paintEvent(self, event):
        painter = QPainter(self)

        for i in range(100, 10, -1):
            brush = QBrush(QColor(i + 70, i * 2, 255 - i*2))
            pen = QPen(brush, i, Qt.SolidLine)
            pen.setJoinStyle(Qt.RoundJoin)
            pen.setCapStyle(Qt.RoundCap)
            painter.setPen(pen)
            painter.drawPolyline(self.points)


App = QApplication(sys.argv)
window = Window()
sys.exit(App.exec())

    坡度

    • 0

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