def drawRoundedFrame(self, painter, rect, xRadius, yRadius, palette,
lineWidth, frameStyle):
"""
Draw a rectangular frame with rounded borders
:param QPainter painter: Painter
:param QRectF rect: Frame rectangle
:param float xRadius: x-radius of the ellipses defining the corners
:param float yRadius: y-radius of the ellipses defining the corners
:param QPalette palette: `QPalette.WindowText` is used for plain borders, `QPalette.Dark` and `QPalette.Light` for raised or sunken borders
:param int lineWidth: Line width
:param int frameStyle: bitwise OR´ed value of `QFrame.Shape` and `QFrame.Shadow`
"""
painter.save()
painter.setRenderHint(QPainter.Antialiasing, True)
painter.setBrush(Qt.NoBrush)
lw2 = lineWidth * 0.5
r = rect.adjusted(lw2, lw2, -lw2, -lw2)
path = QPainterPath()
path.addRoundedRect(r, xRadius, yRadius)
Plain, Sunken, Raised = list(range(3))
style = Plain
if (frameStyle & QFrame.Sunken) == QFrame.Sunken:
style = Sunken
if (frameStyle & QFrame.Raised) == QFrame.Raised:
style = Raised
if style != Plain and path.elementCount() == 17:
pathList = [QPainterPath() for _i in range(8)]
for i in range(4):
j = i * 4 + 1
pathList[2 * i].moveTo(
path.elementAt(j - 1).x,
path.elementAt(j - 1).y)
pathList[2 * i].cubicTo(
path.elementAt(j + 0).x,
path.elementAt(j + 0).y,
path.elementAt(j + 1).x,
path.elementAt(j + 1).y,
path.elementAt(j + 2).x,
path.elementAt(j + 2).y,
)
pathList[2 * i + 1].moveTo(
path.elementAt(j + 2).x,
path.elementAt(j + 2).y)
pathList[2 * i + 1].lineTo(
path.elementAt(j + 3).x,
path.elementAt(j + 3).y)
c1 = QColor(palette.color(QPalette.Dark))
c2 = QColor(palette.color(QPalette.Light))
if style == Raised:
c1, c2 = c2, c1
for i in range(5):
r = pathList[2 * i].controlPointRect()
arcPen = QPen()
arcPen.setCapStyle(Qt.FlatCap)
arcPen.setWidth(lineWidth)
linePen = QPen()
linePen.setCapStyle(Qt.FlatCap)
linePen.setWidth(lineWidth)
if i == 0:
arcPen.setColor(c1)
linePen.setColor(c1)
elif i == 1:
gradient = QLinearGradient()
gradient.setStart(r.topLeft())
gradient.setFinalStop(r.bottomRight())
gradient.setColorAt(0.0, c1)
gradient.setColorAt(1.0, c2)
arcPen.setBrush(gradient)
linePen.setColor(c2)
elif i == 2:
arcPen.setColor(c2)
linePen.setColor(c2)
elif i == 3:
gradient = QLinearGradient()
gradient.setStart(r.bottomRight())
gradient.setFinalStop(r.topLeft())
gradient.setColorAt(0.0, c2)
gradient.setColorAt(1.0, c1)
arcPen.setBrush(gradient)
linePen.setColor(c1)
painter.setPen(arcPen)
painter.drawPath(pathList[2 * i])
painter.setPen(linePen)
painter.drawPath(pathList[2 * i + 1])
else:
pen = QPen(palette.color(QPalette.WindowText), lineWidth)
painter.setPen(pen)
painter.drawPath(path)
painter.restore()
class _GradientLegend(GraphicsWidget):
"""Class to make GradientLegend a GraphicsWidget.
Draws a color gradient rectangle along with text labels denoting the value
at specific points along the gradient.
Parameters
----------
size : list of int, optional
Size of the widget within the GraphicsWidget rectangle.
colors : a list of RGB codes, optional
The lookup table to be used to design the gradient.
labels : dict of keys = strings and values = int
The labels that will appear along the colorbar.
The values determine the sequence of labels in descending order.
minVal : int, optional
If labels is None, so only minVal and maxVal are displayed in the
beggining and in the end of the colorbar.
maxVal : int, optional
If labels is None, so only minVal and maxVal are displayed in the
beggining and in the end of the colorbar.
"""
def __init__(self,
size=None,
colors=None,
labels=None,
minVal=None,
maxVal=None):
GraphicsWidget.__init__(self)
self.setAcceptedMouseButtons(Qt.NoButton)
self.size = size
# if min and max values are None, assume normalized data
self.minVal = 0 if minVal is None else minVal
self.maxVal = 1 if maxVal is None else maxVal
self.labels = {1: 'min', 0: 'max'} if labels is None else labels
self.label_format = '{: .3f}'
self.gradient = QLinearGradient()
if colors is None:
self.colors = [[0, 0, 0], [255, 0, 0]]
else:
self.colors = colors
self.setIntColorScale(colors=self.colors,
minVal=self.minVal,
maxVal=self.maxVal,
labels=self.labels)
def setIntColorScale(self, colors, minVal=None, maxVal=None, labels=None):
# generate color gradient
g = QLinearGradient()
for i in range(len(colors)):
x = float(i) / len(colors)
g.setColorAt(x, QColor(colors[i][0], colors[i][1], colors[i][2]))
self._setGradient(g)
# add labels
if labels is None and (minVal is None or maxVal is None):
self.setLabels(self.labels)
elif labels is None:
self.setLabels({1: str(minVal), 0: str(maxVal)})
else:
self.setLabels(labels)
def _setGradient(self, g):
self.gradient = g
self.update()
def setLimits(self, data):
minVal = data[0]
maxVal = data[1]
if minVal == self.minVal and maxVal == self.maxVal:
return
self.minVal = minVal
self.maxVal = maxVal
for k in self.labels.keys():
newv = minVal + (1 - k) * (maxVal - minVal)
newv = self.label_format.format(newv)
self.labels[k] = newv
self.setLabels(self.labels)
def setLabels(self, l):
"""
Define labels to appear next to the color scale.
Accepts a dict of {text: value} pairs.
"""
self.labels = l
self.update()
def paint(self, p, opt, widget):
GraphicsWidget.paint(self, p, opt, widget)
rect = self.boundingRect() # Boundaries of visible area in scene coord
size = self.size if self.size is not None \
else [rect.right()-rect.left(), rect.bottom() - rect.top()]
# determine max width of all labels
textPadding = 2 # in px
labelWidth = 0
labelHeight = 0
for val in self.labels.values():
b = p.boundingRect(QRectF(0, 0, 0, 0),
Qt.AlignLeft | Qt.AlignVCenter, str(val))
labelWidth = max(labelWidth, b.width())
labelHeight = max(labelHeight, b.height())
x1_back = (rect.right() - rect.left() - size[0]) / 2
x2_back = (rect.right() - rect.left() + size[0]) / 2
y1_back = (rect.bottom() - rect.top() - size[1]) / 2
y2_back = (rect.bottom() - rect.top() + size[1]) / 2
x1_grad = x1_back + textPadding * 2
x2_grad = x2_back - (labelWidth + textPadding * 2)
y1_grad = y1_back + (labelHeight / 2 + textPadding)
y2_grad = y2_back - (labelHeight / 2 + textPadding)
# Draw background
p.setPen(QPen(QColor(0, 0, 0, 0)))
p.setBrush(QBrush(QColor(255, 255, 255, 0)))
rect = QRectF(QPointF(x1_back, y1_back), QPointF(x2_back, y2_back))
p.drawRect(rect)
# Draw color bar
self.gradient.setStart(0, y2_grad)
self.gradient.setFinalStop(0, y1_grad)
p.setPen(QPen(QColor(0, 0, 0)))
p.setBrush(self.gradient)
rect = QRectF(QPointF(x1_grad, y1_grad), QPointF(x2_grad, y2_grad))
p.drawRect(rect)
# draw labels
tx = x2_grad + textPadding * 2
lw = labelWidth
lh = labelHeight
for key, val in self.labels.items():
y = y1_grad + key * (y2_grad - y1_grad)
p.drawText(QRectF(tx, y - lh / 2.0, lw, lh),
Qt.AlignLeft | Qt.AlignVCenter, str(val))
self.setMinimumWidth(labelWidth + 2 * textPadding + 20)
