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Draw GradientLegend in ViewBox coordinates (#1864) 

* draw GradientLegend in ViewBox coordinates

* some cleanup

* do not proceed with dummy values

* correct bar and label order, add some styling options

* remove debugging code
This commit is contained in:
Nils Nemitz 2021-07-04 13:43:39 +09:00 committed by GitHub
parent 4b7dfdef88
commit 523b31e97f
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 29 additions and 19 deletions
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1
pyqtgraph/colormap.py
View File

@ -104,7 +104,6 @@ def _getFromFile(name):
else:
csv_mode = False
for line in fh:
name = None
line = line.strip()
if len(line) == 0: continue # empty line
if line[0] == ';': continue # comment

47
pyqtgraph/graphicsItems/GradientLegend.py
View File

@ -15,17 +15,25 @@ class GradientLegend(UIGraphicsItem):
self.offset = offset
UIGraphicsItem.__init__(self)
self.setAcceptedMouseButtons(QtCore.Qt.MouseButton.NoButton)
self.brush = QtGui.QBrush(QtGui.QColor(200,0,0))
self.brush = QtGui.QBrush(QtGui.QColor(255,255,255,100)) # background color
self.pen = QtGui.QPen(QtGui.QColor(0,0,0))
self.textPen = QtGui.QPen(QtGui.QColor(0,0,0))
self.labels = {'max': 1, 'min': 0}
self.gradient = QtGui.QLinearGradient()
self.gradient.setColorAt(0, QtGui.QColor(0,0,0))
self.gradient.setColorAt(1, QtGui.QColor(255,0,0))
self.setZValue(100) # draw on top of ordinary plots
def setGradient(self, g):
self.gradient = g
self.update()
def setColorMap(self, colormap):
"""
Set displayed gradient from a :class:`~pyqtgraph.ColorMap` object.
"""
self.gradient = colormap.getGradient()
def setIntColorScale(self, minVal, maxVal, *args, **kargs):
colors = [fn.intColor(i, maxVal-minVal, *args, **kargs) for i in range(minVal, maxVal)]
g = QtGui.QLinearGradient()
@ -45,14 +53,15 @@ class GradientLegend(UIGraphicsItem):
def paint(self, p, opt, widget):
UIGraphicsItem.paint(self, p, opt, widget)
rect = self.boundingRect() ## Boundaries of visible area in scene coords.
unit = self.pixelSize() ## Size of one view pixel in scene coords.
if unit[0] is None:
return
## Have to scale painter so that text and gradients are correct size and not upside down
p.scale(unit[0], -unit[1])
view = self.getViewBox()
if view is None:
return
p.save() # save painter state before we change transformation
trans = view.sceneTransform()
p.setTransform( trans ) # draw in ViewBox pixel coordinates
rect = view.rect()
## determine max width of all labels
labelWidth = 0
labelHeight = 0
@ -63,10 +72,10 @@ class GradientLegend(UIGraphicsItem):
textPadding = 2 # in px
xR = rect.right() / unit[0]
xL = rect.left() / unit[0]
yB = -(rect.top() / unit[1])
yT = -(rect.bottom() / unit[1])
xR = rect.right()
xL = rect.left()
yT = rect.top()
yB = rect.bottom()
# coordinates describe edges of text and bar, additional margins will be added for background
if self.offset[0] < 0:
@ -87,7 +96,7 @@ class GradientLegend(UIGraphicsItem):
## Draw background
p.setPen(self.pen)
p.setBrush(QtGui.QBrush(QtGui.QColor(255,255,255,100)))
p.setBrush(self.brush) # background color
rect = QtCore.QRectF(
QtCore.QPointF(x1 - textPadding, y1-labelHeight/2 - textPadding), # extra left/top padding
QtCore.QPointF(x3 + textPadding, y2+labelHeight/2 + textPadding) # extra bottom/right padding
@ -95,20 +104,22 @@ class GradientLegend(UIGraphicsItem):
p.drawRect(rect)
## Draw color bar
self.gradient.setStart(0, y1)
self.gradient.setFinalStop(0, y2)
self.gradient.setStart(0, y2)
self.gradient.setFinalStop(0, y1)
p.setBrush(self.gradient)
rect = QtCore.QRectF(
QtCore.QPointF(x1, y1),
QtCore.QPointF(x1, y1),
QtCore.QPointF(x2, y2)
)
p.drawRect(rect)
## draw labels
p.setPen(QtGui.QPen(QtGui.QColor(0,0,0)))
p.setPen(self.textPen)
tx = x2 + 2 * textPadding # margin between bar and text
lh = labelHeight
lw = labelWidth
for k in self.labels:
y = y1 + self.labels[k] * (y2-y1)
y = y2 - self.labels[k] * (y2-y1)
p.drawText(QtCore.QRectF(tx, y - lh/2, lw, lh), QtCore.Qt.AlignmentFlag.AlignLeft | QtCore.Qt.AlignmentFlag.AlignVCenter, str(k))
p.restore() # restore QPainter transform to original state