def createCurveIcons(self): pix = QPixmap(self.m_iconSize) painter = QPainter() gradient = QLinearGradient(0, 0, 0, self.m_iconSize.height()) gradient.setColorAt(0.0, QColor(240, 240, 240)) gradient.setColorAt(1.0, QColor(224, 224, 224)) brush = QBrush(gradient) # The original C++ code uses undocumented calls to get the names of the # different curve types. We do the Python equivalant (but without # cheating). curve_types = [(n, c) for n, c in QEasingCurve.__dict__.items() if isinstance(c, QEasingCurve.Type) and c != QEasingCurve.Custom] curve_types.sort(key=lambda ct: ct[1]) painter.begin(pix) for curve_name, curve_type in curve_types: painter.fillRect(QRect(QPoint(0, 0), self.m_iconSize), brush) curve = QEasingCurve(curve_type) if curve_type == QEasingCurve.BezierSpline: curve.addCubicBezierSegment(QPointF(0.4, 0.1), QPointF(0.6, 0.9), QPointF(1.0, 1.0)) elif curve_type == QEasingCurve.TCBSpline: curve.addTCBSegment(QPointF(0.0, 0.0), 0, 0, 0) curve.addTCBSegment(QPointF(0.3, 0.4), 0.2, 1, -0.2) curve.addTCBSegment(QPointF(0.7, 0.6), -0.2, 1, 0.2) curve.addTCBSegment(QPointF(1.0, 1.0), 0, 0, 0) painter.setPen(QColor(0, 0, 255, 64)) xAxis = self.m_iconSize.height() / 1.5 yAxis = self.m_iconSize.width() / 3.0 painter.drawLine(0, xAxis, self.m_iconSize.width(), xAxis) painter.drawLine(yAxis, 0, yAxis, self.m_iconSize.height()) curveScale = self.m_iconSize.height() / 2.0; painter.setPen(Qt.NoPen) # Start point. painter.setBrush(Qt.red) start = QPoint(yAxis, xAxis - curveScale * curve.valueForProgress(0)) painter.drawRect(start.x() - 1, start.y() - 1, 3, 3) # End point. painter.setBrush(Qt.blue) end = QPoint(yAxis + curveScale, xAxis - curveScale * curve.valueForProgress(1)) painter.drawRect(end.x() - 1, end.y() - 1, 3, 3) curvePath = QPainterPath() curvePath.moveTo(QPointF(start)) t = 0.0 while t <= 1.0: to = QPointF(yAxis + curveScale * t, xAxis - curveScale * curve.valueForProgress(t)) curvePath.lineTo(to) t += 1.0 / curveScale painter.setRenderHint(QPainter.Antialiasing, True) painter.strokePath(curvePath, QColor(32, 32, 32)) painter.setRenderHint(QPainter.Antialiasing, False) item = QListWidgetItem() item.setIcon(QIcon(pix)) item.setText(curve_name) self.m_ui.easingCurvePicker.addItem(item) painter.end()