我正在尝试用一些文本构建一个弧线。我能够创建弧线,并且可以将文本与曲线一起放置。但到目前为止,我找不到垂直于曲线旋转文本的方法。
这是我正在尝试的代码
from __future__ import division
import os
import sys
from PyQt4 import QtGui,QtCore
import math
class PathPaintTest(QtGui.QFrame):
def __init__(self, *args):
super (PathPaintTest, self).__init__(*args)
self.setMaximumSize(250, 110)
self.setMinimumSize(250, 110)
self.setFrameShape(QtGui.QFrame.WinPanel)
self.setFrameShadow(QtGui.QFrame.Sunken)
def paintEvent(self, event):
hw = QtCore.QString("Hello World")
drawWidth = self.width() / 100
painter = QtGui.QPainter(self)
pen = painter.pen()
pen.setWidth(drawWidth)
pen.setColor(QtGui.QColor(QtCore.Qt.red))
painter.setPen(pen)
painter.translate(5,0)
cc1 = QtCore.QPointF(5, -15)
cc2 = QtCore.QPointF(220, -15)
path1 = QtGui.QPainterPath(QtCore.QPointF(5, 140))
path1.cubicTo(cc1, cc2, QtCore.QPointF(240, 140))
painter.drawPath(path1)
pen.setColor(QtGui.QColor(QtCore.Qt.yellow))
painter.setPen(pen)
font = painter.font()
font.setPixelSize(drawWidth * 5)
painter.setFont(font)
percentIncrease = 1 / (hw.size() + 1)
perecent = 0
for i in range(hw.size()):
perecent+=percentIncrease
point = QtCore.QPointF(path1.pointAtPercent(perecent))
painter.drawText(point,QtCore.QString(hw[i]))
QtGui.QFrame.paintEvent(self,event)
class TextTest(QtGui.QWidget):
def __init__(self):
super(TextTest, self).__init__()
self.initUI()
def keyPressEvent(self, event):
if event.key() == QtCore.Qt.Key_Escape:
self.close()
def initUI(self):
self.mypb = PathPaintTest()
hbox = QtGui.QHBoxLayout()
hbox.addWidget(self.mypb)
vbox = QtGui.QVBoxLayout()
vbox.addLayout(hbox)
self.setLayout(vbox)
self.setGeometry(1900, 500, 450, 180)
self.setWindowTitle('Text Test')
def run():
app = QtGui.QApplication(sys.argv)
ex = TextTest()
ex.show()
sys.exit(app.exec_())
if __name__ == "__main__":
run()
但我正在尝试实现接近这篇文章http://zrusin.blogspot.com/2006/11/text-on-path.html的东西。喜欢文本要根据角度旋转。知道如何使用 QPainterPath 和 QPainter 或任何其他方法吗?
我正在寻找这样的输出
很抱歉,由于声誉较低,我无法将图片添加到我的帖子中。
编辑 :
这是一些更新版本..它的python版本的qt-project.org/faq/answer/how_do_i_make_text_follow_the_line_curve_and_angle_of_the_qpainterpath
from __future__ import division
import os
import sys
from PyQt4 import QtGui,QtCore
import math
class PathPaintTest(QtGui.QFrame):
def __init__(self, *args):
super (PathPaintTest, self).__init__(*args)
self.setMaximumSize(250, 110)
self.setMinimumSize(250, 110)
self.setFrameShape(QtGui.QFrame.WinPanel)
self.setFrameShadow(QtGui.QFrame.Sunken)
def paintEvent(self, event):
hw = QtCore.QString("Hello World")
drawWidth = self.width() / 100
painter = QtGui.QPainter(self)
pen = painter.pen()
pen.setWidth(drawWidth)
pen.setColor(QtGui.QColor(QtCore.Qt.red))
painter.setPen(pen)
painter.translate(5,0)
c1 = QtCore.QPointF(5, -15)
c2 = QtCore.QPointF(220, -15)
path = QtGui.QPainterPath(QtCore.QPointF(5, 140))
path.cubicTo(c1, c2, QtCore.QPointF(240, 140))
painter.drawPath(path)
pen.setColor(QtGui.QColor(QtCore.Qt.green))
painter.setPen(pen)
font = painter.font()
font.setPixelSize(drawWidth * 10)
painter.setFont(font)
perecentIncrease = 1 / (hw.size() + 1)
perecent = 0
for i in range(hw.size()):
perecent+=perecentIncrease
point = QtCore.QPointF(path.pointAtPercent(perecent))
angle = path.angleAtPercent(perecent)
rad = math.radians(angle)
sina = math.sin(rad)
cosa = math.cos(rad)
deltaPenX = cosa * pen.width()
deltaPenY = sina * pen.width()
newX = (cosa * point.x()) - (sina * point.y())
newY = (cosa * point.y()) + (sina * point.x())
deltaX = newX - point.x()
deltaY = newY - point.y()
tran = QtGui.QTransform(cosa,sina,-sina,cosa,-deltaX + deltaPenX,-deltaY - deltaPenY)
painter.setWorldTransform(tran)
painter.drawText(point,QtCore.QString(hw[i]))
QtGui.QFrame.paintEvent(self,event)
class TextTest(QtGui.QWidget):
def __init__(self):
super(TextTest, self).__init__()
self.initUI()
def keyPressEvent(self, event):
if event.key() == QtCore.Qt.Key_Escape:
self.close()
def initUI(self):
self.mypb = PathPaintTest()
hbox = QtGui.QHBoxLayout()
hbox.addWidget(self.mypb)
vbox = QtGui.QVBoxLayout()
vbox.addLayout(hbox)
self.setLayout(vbox)
self.setGeometry(300, 200, 500, 250)
self.setWindowTitle('Text Test')
def run():
app = QtGui.QApplication(sys.argv)
ex = TextTest()
ex.show()
sys.exit(app.exec_())
if __name__ == "__main__":
run()
但我仍然无法获得轮换。
更新 :
我现在开始工作了,这是更新的部分,也许它也会帮助其他人。
painter.save()
painter.translate(point)
painter.rotate(-angle)
painter.drawText(QtCore.QPoint(0, -pen.width()),QtCore.QString(hw[i]))
painter.restore();