115 lines
4.2 KiB
Python
115 lines
4.2 KiB
Python
from ..Qt import QtGui, QtCore
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from .UIGraphicsItem import *
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from .. import functions as fn
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__all__ = ['GradientLegend']
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class GradientLegend(UIGraphicsItem):
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"""
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Draws a color gradient rectangle along with text labels denoting the value at specific
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points along the gradient.
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"""
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def __init__(self, size, offset):
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self.size = size
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self.offset = offset
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UIGraphicsItem.__init__(self)
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self.setAcceptedMouseButtons(QtCore.Qt.NoButton)
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self.brush = QtGui.QBrush(QtGui.QColor(200,0,0))
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self.pen = QtGui.QPen(QtGui.QColor(0,0,0))
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self.labels = {'max': 1, 'min': 0}
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self.gradient = QtGui.QLinearGradient()
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self.gradient.setColorAt(0, QtGui.QColor(0,0,0))
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self.gradient.setColorAt(1, QtGui.QColor(255,0,0))
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def setGradient(self, g):
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self.gradient = g
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self.update()
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def setIntColorScale(self, minVal, maxVal, *args, **kargs):
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colors = [fn.intColor(i, maxVal-minVal, *args, **kargs) for i in range(minVal, maxVal)]
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g = QtGui.QLinearGradient()
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for i in range(len(colors)):
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x = float(i)/len(colors)
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g.setColorAt(x, colors[i])
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self.setGradient(g)
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if 'labels' not in kargs:
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self.setLabels({str(minVal/10.): 0, str(maxVal): 1})
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else:
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self.setLabels({kargs['labels'][0]:0, kargs['labels'][1]:1})
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def setLabels(self, l):
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"""Defines labels to appear next to the color scale. Accepts a dict of {text: value} pairs"""
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self.labels = l
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self.update()
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def paint(self, p, opt, widget):
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UIGraphicsItem.paint(self, p, opt, widget)
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rect = self.boundingRect() ## Boundaries of visible area in scene coords.
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unit = self.pixelSize() ## Size of one view pixel in scene coords.
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if unit[0] is None:
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return
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## determine max width of all labels
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labelWidth = 0
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labelHeight = 0
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for k in self.labels:
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b = p.boundingRect(QtCore.QRectF(0, 0, 0, 0), QtCore.Qt.AlignLeft | QtCore.Qt.AlignVCenter, str(k))
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labelWidth = max(labelWidth, b.width())
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labelHeight = max(labelHeight, b.height())
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labelWidth *= unit[0]
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labelHeight *= unit[1]
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textPadding = 2 # in px
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if self.offset[0] < 0:
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x3 = rect.right() + unit[0] * self.offset[0]
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x2 = x3 - labelWidth - unit[0]*textPadding*2
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x1 = x2 - unit[0] * self.size[0]
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else:
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x1 = rect.left() + unit[0] * self.offset[0]
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x2 = x1 + unit[0] * self.size[0]
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x3 = x2 + labelWidth + unit[0]*textPadding*2
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if self.offset[1] < 0:
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y2 = rect.top() - unit[1] * self.offset[1]
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y1 = y2 + unit[1] * self.size[1]
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else:
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y1 = rect.bottom() - unit[1] * self.offset[1]
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y2 = y1 - unit[1] * self.size[1]
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self.b = [x1,x2,x3,y1,y2,labelWidth]
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## Draw background
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p.setPen(self.pen)
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p.setBrush(QtGui.QBrush(QtGui.QColor(255,255,255,100)))
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rect = QtCore.QRectF(
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QtCore.QPointF(x1 - unit[0]*textPadding, y1 + labelHeight/2 + unit[1]*textPadding),
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QtCore.QPointF(x3, y2 - labelHeight/2 - unit[1]*textPadding)
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)
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p.drawRect(rect)
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## Have to scale painter so that text and gradients are correct size. Bleh.
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p.scale(unit[0], unit[1])
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## Draw color bar
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self.gradient.setStart(0, y1/unit[1])
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self.gradient.setFinalStop(0, y2/unit[1])
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p.setBrush(self.gradient)
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rect = QtCore.QRectF(
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QtCore.QPointF(x1/unit[0], y1/unit[1]),
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QtCore.QPointF(x2/unit[0], y2/unit[1])
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)
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p.drawRect(rect)
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## draw labels
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p.setPen(QtGui.QPen(QtGui.QColor(0,0,0)))
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tx = x2 + unit[0]*textPadding
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lh = labelHeight/unit[1]
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for k in self.labels:
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y = y1 + self.labels[k] * (y2-y1)
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p.drawText(QtCore.QRectF(tx/unit[0], y/unit[1] - lh/2.0, 1000, lh), QtCore.Qt.AlignLeft | QtCore.Qt.AlignVCenter, str(k))
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