python3+PyQt5 はカスタム流体混合ウィジェットを実装します

この記事では主に Python3+PyQt5 でカスタム流体混合ウィジェットを実装する方法を詳しく紹介します。興味のある方は参考にしてください。この記事では Python3+PyQt5 を使用してカスタム ウィジェット - 流体混合ウィジェットを実装します。論理 (ウィンドウ) 座標を介して描画されます。 setWindow を呼び出すと、すべての描画作業が論理座標系に従って行われます。

#!/usr/bin/env python3

from PyQt5.QtCore import (QPointF, QSize, Qt,pyqtSignal)
from PyQt5.QtWidgets import (QApplication,
  QFrame, QLabel,
  QSizePolicy, QSpinBox, QWidget)
from PyQt5.QtGui import QColor,QPainter,QFontMetricsF,QBrush,QLinearGradient,QPolygon,QPolygonF

class YPipeWidget(QWidget):
 signal_valuechanged = pyqtSignal(int,int)
 def __init__(self, leftFlow=0, rightFlow=0, maxFlow=100,
     parent=None):
  super(YPipeWidget, self).__init__(parent)

  self.leftSpinBox = QSpinBox(self)
  self.leftSpinBox.setRange(0, maxFlow)
  self.leftSpinBox.setValue(leftFlow)
  self.leftSpinBox.setSuffix(" l/s")
  self.leftSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
  self.leftSpinBox.valueChanged.connect(self.valueChanged)
  self.rightSpinBox = QSpinBox(self)
  self.rightSpinBox.setRange(0, maxFlow)
  self.rightSpinBox.setValue(rightFlow)
  self.rightSpinBox.setSuffix(" l/s")
  self.rightSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
  self.rightSpinBox.valueChanged.connect(self.valueChanged)

  self.label = QLabel(self)
  self.label.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)
  self.label.setAlignment(Qt.AlignCenter)
  fm = QFontMetricsF(self.font())
  self.label.setMinimumWidth(fm.width(" 999 l/s "))

  self.setSizePolicy(QSizePolicy(QSizePolicy.Expanding,
          QSizePolicy.Expanding))
  self.setMinimumSize(self.minimumSizeHint())
  self.valueChanged()


 def valueChanged(self):
  a = self.leftSpinBox.value()
  b = self.rightSpinBox.value()
  self.label.setText("{0} l/s".format(a + b))
  self.signal_valuechanged.emit(a,b)
  self.update()


 def values(self):
  return self.leftSpinBox.value(), self.rightSpinBox.value()


 def minimumSizeHint(self):
  return QSize(self.leftSpinBox.width() * 3,
      self.leftSpinBox.height() * 5)


 def resizeEvent(self, event=None):
  fm = QFontMetricsF(self.font())
  x = (self.width() - self.label.width()) / 2
  y = self.height() - (fm.height() * 1.5)
  self.label.move(x, y)
  y = self.height() / 60.0
  x = (self.width() / 4.0) - self.leftSpinBox.width()
  self.leftSpinBox.move(x, y)
  x = self.width() - (self.width() / 4.0)
  self.rightSpinBox.move(x, y)


 def paintEvent(self, event=None):
  LogicalSize = 100.0

  def logicalFromPhysical(length, side):
   return (length / side) * LogicalSize

  fm = QFontMetricsF(self.font())
  ymargin = ((LogicalSize / 30.0) +
     logicalFromPhysical(self.leftSpinBox.height(),
          self.height()))
  ymax = (LogicalSize -
    logicalFromPhysical(fm.height() * 2, self.height()))
  width = LogicalSize / 4.0
  cx, cy = LogicalSize / 2.0, LogicalSize / 3.0
  ax, ay = cx - (2 * width), ymargin
  bx, by = cx - width, ay
  dx, dy = cx + width, ay
  ex, ey = cx + (2 * width), ymargin
  fx, fy = cx + (width / 2), cx + (LogicalSize / 24.0)
  gx, gy = fx, ymax
  hx, hy = cx - (width / 2), ymax
  ix, iy = hx, fy

  painter = QPainter(self)
  painter.setRenderHint(QPainter.Antialiasing)
  side = min(self.width(), self.height())
  painter.setViewport((self.width() - side) / 2,
       (self.height() - side) / 2, side, side)
  painter.setWindow(0, 0, LogicalSize, LogicalSize)

  painter.setPen(Qt.NoPen)

  gradient = QLinearGradient(QPointF(0, 0),
           QPointF(0, 100))
  gradient.setColorAt(0, Qt.white)
  a = self.leftSpinBox.value()
  gradient.setColorAt(1, (Qt.red if a != 0 else Qt.white))
  painter.setBrush(QBrush(gradient))
  painter.drawPolygon(QPolygonF([QPointF(ax, ay), QPointF(bx, by), QPointF(cx, cy), QPointF(ix, iy)]))

  gradient = QLinearGradient(QPointF(0, 0), QPointF(0, 100))
  gradient.setColorAt(0, Qt.white)
  b = self.rightSpinBox.value()
  gradient.setColorAt(1, (Qt.blue if b != 0
        else Qt.white))
  painter.setBrush(QBrush(gradient))
  painter.drawPolygon(QPolygonF([QPointF(cx, cy), QPointF(dx, dy),QPointF(ex, ey),QPointF(fx, fy)]))

  if (a + b) == 0:
   color = QColor(Qt.white)
  else:
   ashare = (a / (a + b)) * 255.0
   bshare = 255.0 - ashare
   color = QColor(ashare, 0, bshare)
  gradient = QLinearGradient(QPointF(0, 0), QPointF(0, 100))
  gradient.setColorAt(0, Qt.white)
  gradient.setColorAt(1, color)
  painter.setBrush(QBrush(gradient))
  painter.drawPolygon(QPolygonF(
    [QPointF(cx, cy),QPointF(fx, fy),QPointF(gx, gy), QPointF(hx, hy),QPointF(ix, iy)]))

  painter.setPen(Qt.black)
  painter.drawPolyline(QPolygonF([QPointF(ax, ay), QPointF(ix, iy),QPointF(hx, hy)]))
  painter.drawPolyline(QPolygonF([QPointF(gx, gy), QPointF(fx, fy), QPointF(ex, ey)]))
  painter.drawPolyline(QPolygonF([QPointF(bx, by), QPointF(cx, cy), QPointF(dx, dy)]))

if __name__ == "__main__":
 import sys

 def valueChanged(a, b):
  print(a, b)

 app = QApplication(sys.argv)
 form = YPipeWidget()
 form.signal_valuechanged.connect(valueChanged)
 form.setWindowTitle("YPipe")
 form.move(0, 0)
 form.show()
 form.resize(400, 400)
 app.exec_()

実行結果:

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