如何创建“色环"在 PyQt 中? [英] How to create a "Color Circle" in PyQt?

问题描述

我想创建一个看起来像这样的 QWidget/QDialog:

I would like to create a QWidget/QDialog that looks like this:

Color Circle
or:
Windows Color Picker

I am aware of QColorDialog, but i do not want to use it.

解决方案

HSV Color Space

from PyQt5 import QtWidgets, QtCore, QtGui
import sys
import numpy as np

class ColorCircle(QtWidgets.QWidget):

    def __init__(self):
        super().__init__()
        self.radius = 100.
        self.setFixedSize(200, 200)

    def paintEvent(self, ev):
        super().paintEvent(ev)
        p = QtGui.QPainter(self)
        for i in range(self.width()):
            for j in range(self.height()):
                color = QtGui.QColor(255, 255, 255, 255)
                h = (np.arctan2(i-self.radius, j-self.radius)+np.pi)/(2.*np.pi)
                s = np.sqrt(np.power(i-self.radius, 2)+np.power(j-self.radius, 2))/self.radius
                v = 1.0
                if s < 1.0:
                    color.setHsvF(h, s, v, 1.0)
                p.setPen(color)
                p.drawPoint(i, j)

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = ColorCircle()
    w.show()
    app.exec()

Output:

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