def palette_gradient(colors):
n = len(colors)
stops = np.linspace(0.0, 1.0, n, endpoint=True)
gradstops = [(float(stop), color) for stop, color in zip(stops, colors)]
grad = QLinearGradient(QPointF(0, 0), QPointF(1, 0))
grad.setStops(gradstops)
return grad
def palette_gradient(colors, discrete=False):
n = len(colors)
stops = numpy.linspace(0.0, 1.0, n, endpoint=True)
gradstops = [(float(stop), color) for stop, color in zip(stops, colors)]
grad = QLinearGradient(QPointF(0, 0), QPointF(1, 0))
grad.setStops(gradstops)
return grad
class ImageColorLegend(GraphicsWidget):
def __init__(self):
GraphicsWidget.__init__(self)
self.width_bar = 15
self.colors = None
self.gradient = QLinearGradient()
self.setMaximumHeight(2**16)
self.setMinimumWidth(self.width_bar)
self.setMaximumWidth(self.width_bar)
self.rect = QGraphicsRectItem(QRectF(0, 0, self.width_bar, 100), self)
self.axis = pg.AxisItem('right', parent=self)
self.axis.setX(self.width_bar)
self.axis.geometryChanged.connect(self._update_width)
self.adapt_to_size()
self._initialized = True
def _update_width(self):
aw = self.axis.minimumWidth()
self.setMinimumWidth(self.width_bar + aw)
self.setMaximumWidth(self.width_bar + aw)
def resizeEvent(self, ev):
if hasattr(self, "_initialized"):
self.adapt_to_size()
def adapt_to_size(self):
h = self.height()
self.resetTransform()
self.rect.setRect(0, 0, self.width_bar, h)
self.axis.setHeight(h)
self.gradient.setStart(QPointF(0, h))
self.gradient.setFinalStop(QPointF(0, 0))
self.update_rect()
def set_colors(self, colors):
# a Nx3 array containing colors
self.colors = colors
if self.colors is not None:
positions = np.linspace(0, 1, len(self.colors))
stops = []
for p, c in zip(positions, self.colors):
stops.append((p, QColor(*c)))
self.gradient.setStops(stops)
self.update_rect()
def set_range(self, low, high):
self.axis.setRange(low, high)
def update_rect(self):
if self.colors is None:
self.rect.setBrush(QBrush(Qt.white))
else:
self.rect.setBrush(QBrush(self.gradient))
def create_gradient(base_color: QColor, stop=QPointF(0, 0),
finalStop=QPointF(0, 1)) -> QLinearGradient:
"""
Create a default linear gradient using `base_color` .
"""
grad = QLinearGradient(stop, finalStop)
grad.setStops([(0.0, base_color),
(0.5, base_color),
(0.8, base_color.darker(105)),
(1.0, base_color.darker(110)),
])
grad.setCoordinateMode(QLinearGradient.ObjectBoundingMode)
return grad
def create_gradient(base_color, stop=QPointF(0, 0),
finalStop=QPointF(0, 1)):
"""
Create a default linear gradient using `base_color` .
"""
grad = QLinearGradient(stop, finalStop)
grad.setStops([(0.0, base_color),
(0.5, base_color),
(0.8, base_color.darker(105)),
(1.0, base_color.darker(110)),
])
grad.setCoordinateMode(QLinearGradient.ObjectBoundingMode)
return grad
class OWLegendGradient(QGraphicsObject):
gradient_width = 20
def __init__(self, palette, values, parent):
QGraphicsObject.__init__(self, parent)
self.parent = parent
self.palette = palette
self.values = values
self.legend = parent
self.label_items = [QGraphicsTextItem(text, self) for text in values]
for i in self.label_items:
i.setTextWidth(50)
self.rect = QRectF()
self.gradient_item = QGraphicsRectItem(self)
self.gradient = QLinearGradient()
self.gradient.setStops([(v * 0.1, self.palette[v * 0.1])
for v in range(11)])
self.orientation = Qt.Horizontal
self.set_orientation(Qt.Vertical)
def set_orientation(self, orientation):
if self.orientation == orientation:
return
self.orientation = orientation
if self.orientation == Qt.Vertical:
height = max(
[item.boundingRect().height() for item in self.label_items])
total_height = height * max(5, len(self.label_items))
interval = (total_height -
self.label_items[-1].boundingRect().height()) / (
len(self.label_items) - 1)
self.gradient_item.setRect(10, 0, self.gradient_width,
total_height)
self.gradient.setStart(10, 0)
self.gradient.setFinalStop(10, total_height)
self.gradient_item.setBrush(QBrush(self.gradient))
self.gradient_item.setPen(QPen(Qt.NoPen))
y = 0
x = 30
for item in self.label_items:
move_item_xy(item, x, y, self.parent.graph.animate_plot)
y += interval
self.rect = QRectF(
10, 0, self.gradient_width +
max([item.boundingRect().width()
for item in self.label_items]),
self.label_items[0].boundingRect().height() *
max(5, len(self.label_items)))
else:
width = 50
height = max(
[item.boundingRect().height() for item in self.label_items])
total_width = width * max(5, len(self.label_items))
interval = (total_width -
self.label_items[-1].boundingRect().width()) / (
len(self.label_items) - 1)
self.gradient_item.setRect(0, 0, total_width, self.gradient_width)
self.gradient.setStart(0, 0)
self.gradient.setFinalStop(total_width, 0)
self.gradient_item.setBrush(QBrush(self.gradient))
self.gradient_item.setPen(QPen(Qt.NoPen))
x = 0
y = 30
for item in self.label_items:
move_item_xy(item, x, y, self.parent.graph.animate_plot)
x += interval
self.rect = QRectF(0, 0, total_width, self.gradient_width + height)
def boundingRect(self):
return getattr(self, 'rect', QRectF())
def paint(self, painter, option, widget):
pass
class OWLegendGradient(QGraphicsObject):
gradient_width = 20
def __init__(self, palette, values, parent):
QGraphicsObject.__init__(self, parent)
self.parent = parent
self.palette = palette
self.values = values
self.legend = parent
self.label_items = [QGraphicsTextItem(text, self) for text in values]
for i in self.label_items:
i.setTextWidth(50)
self.rect = QRectF()
self.gradient_item = QGraphicsRectItem(self)
self.gradient = QLinearGradient()
self.gradient.setStops([(v*0.1, self.palette[v*0.1]) for v in range(11) ])
self.orientation = Qt.Horizontal
self.set_orientation(Qt.Vertical)
def set_orientation(self, orientation):
if self.orientation == orientation:
return
self.orientation = orientation
if self.orientation == Qt.Vertical:
height = max([item.boundingRect().height() for item in self.label_items])
total_height = height * max(5, len(self.label_items))
interval = (total_height - self.label_items[-1].boundingRect().height()) / (len(self.label_items) -1)
self.gradient_item.setRect(10, 0, self.gradient_width, total_height)
self.gradient.setStart(10, 0)
self.gradient.setFinalStop(10, total_height)
self.gradient_item.setBrush(QBrush(self.gradient))
self.gradient_item.setPen(QPen(Qt.NoPen))
y = 0
x = 30
for item in self.label_items:
move_item_xy(item, x, y, self.parent.graph.animate_plot)
y += interval
self.rect = QRectF(10, 0, self.gradient_width + max([item.boundingRect().width() for item in self.label_items]), self.label_items[0].boundingRect().height() * max(5, len(self.label_items)))
else:
width = 50
height = max([item.boundingRect().height() for item in self.label_items])
total_width = width * max(5, len(self.label_items))
interval = (total_width - self.label_items[-1].boundingRect().width()) / (len(self.label_items) -1)
self.gradient_item.setRect(0, 0, total_width, self.gradient_width)
self.gradient.setStart(0, 0)
self.gradient.setFinalStop(total_width, 0)
self.gradient_item.setBrush(QBrush(self.gradient))
self.gradient_item.setPen(QPen(Qt.NoPen))
x = 0
y = 30
for item in self.label_items:
move_item_xy(item, x, y, self.parent.graph.animate_plot)
x += interval
self.rect = QRectF(0, 0, total_width, self.gradient_width + height)
def boundingRect(self):
return getattr(self, 'rect', QRectF())
def paint(self, painter, option, widget):
pass
