本文整理汇总了Python中qgis.PyQt.QtWidgets.QGraphicsLineItem类的典型用法代码示例。如果您正苦于以下问题：Python QGraphicsLineItem类的具体用法？Python QGraphicsLineItem怎么用？Python QGraphicsLineItem使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了QGraphicsLineItem类的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: testSnapPointsToItems
def testSnapPointsToItems(self):
p = QgsProject()
l = QgsLayout(p)
page = QgsLayoutItemPage(l)
page.setPageSize('A4')
#l.pageCollection().addPage(page)
s = QgsLayoutSnapper(l)
guides = l.guides()
s.setSnapToItems(True)
s.setSnapTolerance(1)
# no items
point, snapped = s.snapPointsToItems([0.5], Qt.Horizontal, 1, [])
self.assertFalse(snapped)
line = QGraphicsLineItem()
line.setVisible(True)
point, snapped = s.snapPointsToItems([0.5], Qt.Horizontal, 1, [], line)
self.assertFalse(line.isVisible())
guides.addGuide(QgsLayoutGuide(Qt.Vertical, QgsLayoutMeasurement(1), page))
# add an item
item1 = QgsLayoutItemMap(l)
item1.attemptMove(QgsLayoutPoint(4, 8, QgsUnitTypes.LayoutMillimeters))
item1.attemptResize(QgsLayoutSize(18, 12, QgsUnitTypes.LayoutMillimeters))
l.addItem(item1)
point, snapped = s.snapPointsToItems([3.5], Qt.Horizontal, 1, [], line)
self.assertTrue(snapped)
self.assertEqual(point, 0.5)
self.assertTrue(line.isVisible())
point, snapped = s.snapPointsToItems([4.5], Qt.Horizontal, 1, [])
self.assertTrue(snapped)
self.assertEqual(point, -0.5)
point, snapped = s.snapPointsToItems([4.6, 4.5], Qt.Horizontal, 1, [])
self.assertTrue(snapped)
self.assertEqual(point, -0.5)
point, snapped = s.snapPointsToItems([4.6, 4.5, 3.7], Qt.Horizontal, 1, [])
self.assertTrue(snapped)
self.assertAlmostEqual(point, 0.3, 5)
# ignoring item
point, snapped = s.snapPointsToItems([4.5], Qt.Horizontal, 1, [item1])
self.assertFalse(snapped)
# outside tolerance
point, snapped = s.snapPointsToItems([5.5], Qt.Horizontal, 1, [], line)
self.assertFalse(snapped)
self.assertFalse(line.isVisible())
# snap to center
point, snapped = s.snapPointsToItems([12.5], Qt.Horizontal, 1, [])
self.assertTrue(snapped)
self.assertEqual(point, 0.5)
# snap to right
point, snapped = s.snapPointsToItems([22.5], Qt.Horizontal, 1, [])
self.assertTrue(snapped)
self.assertEqual(point, -0.5)
#snap to top
point, snapped = s.snapPointsToItems([7.5], Qt.Vertical, 1, [], line)
self.assertTrue(snapped)
self.assertEqual(point, 0.5)
self.assertTrue(line.isVisible())
point, snapped = s.snapPointsToItems([8.5], Qt.Vertical, 1, [])
self.assertTrue(snapped)
self.assertEqual(point, -0.5)
# outside tolerance
point, snapped = s.snapPointsToItems([5.5], Qt.Vertical, 1, [], line)
self.assertFalse(snapped)
self.assertFalse(line.isVisible())
# snap to center
point, snapped = s.snapPointsToItems([13.5], Qt.Vertical, 1, [])
self.assertTrue(snapped)
self.assertEqual(point, 0.5)
# snap to bottom
point, snapped = s.snapPointsToItems([20.5], Qt.Vertical, 1, [])
self.assertTrue(snapped)
self.assertEqual(point, -0.5)
# snapping off
s.setSnapToItems(False)
line.setVisible(True)
point, snapped = s.snapPointsToItems([20.5], Qt.Vertical, 1, [], line)
self.assertFalse(snapped)
self.assertFalse(line.isVisible())
# with different pixel scale
s.setSnapToItems(True)
point, snapped = s.snapPointsToItems([20.5], Qt.Vertical, 3, [])
self.assertFalse(snapped)示例2: drawHistogram
def drawHistogram(self):
#if self.inputlayer is None:
# return
self.showInfo("Drawing histogram...")
viewprect = QRectF(self.histoGraphicsView.viewport().rect())
self.histoGraphicsView.setSceneRect(viewprect)
self.setupScene.clear()
self.setupScene.update()
histbottom = self.histoGraphicsView.sceneRect().bottom()
histtop = self.histoGraphicsView.sceneRect().top()
left = self.histoGraphicsView.sceneRect().left() + self.histopadding
right = self.histoGraphicsView.sceneRect().right() - self.histopadding
histheight = histbottom - histtop
histwidth = right - left
step = 1.0 * histwidth / self.histobins
maxlength = histheight
padding = 1
ll = QPoint(self.histopadding - 1, histheight - padding)
start = QPointF(self.histoGraphicsView.mapToScene(ll))
# Check if there is only one value
#myrange = (self.minValueSpinBox.value(),self.maxValueSpinBox.value())
if self.histogramAvailable:
maxvalue = 0.0
for i in range(len(self.histo[0])):
if self.histo[0][i] > maxvalue:
maxvalue = self.histo[0][i]
if maxvalue == 0:
return
self.maxBinNumber.setText(str(maxvalue))
# Create the histogram:
#self.showInfo("maxvalue: " + str(maxvalue))
#self.showInfo("maxlength: " + str(maxlength))
#self.showInfo("step: " + str(step))
for i in range(self.histobins):
binnumber = self.histo[0][i]
if binnumber == 0:
continue
height = (1.0 * self.histo[0][i] / maxvalue *
(maxlength - padding))
rectangle = QGraphicsRectItem(start.x() + step * i,
start.y(),
step,
-height)
rectangle.setPen(QPen(QColor(102, 102, 102)))
rectangle.setBrush(QBrush(QColor(240, 240, 240)))
self.setupScene.addItem(rectangle)
#self.showInfo(str(i) + ": " + str(height))
#if self.levelsListView.model().rowCount() > 0:
# Add lines for the levels
minvalue = float(self.histMinValue.text())
maxvalue = float(self.histMaxValue.text())
datarange = maxvalue - minvalue
if datarange == 0:
return
i = 0
while self.levelsListView.model().item(i):
#self.showInfo("Element: " +
# str(self.levelsListView.model().item(i).text()))
#continue
value = float(self.levelsListView.model().item(i).text())
xvalue = start.x() + histwidth * (value - minvalue) / datarange
line = QGraphicsLineItem(xvalue, 0, xvalue, histheight)
if i == 0 or i == (self.levelsListView.model().rowCount() - 1):
line.setPen(QPen(QColor(204, 0, 0)))
else:
line.setPen(QPen(QColor(0, 204, 0)))
self.setupScene.addItem(line)
i = i + 1