[英]PyQt: Center QPainter text with drawText in QPrinter
我正在嘗試將文本集中在正常的A4尺寸的作品集中,獲得的尺寸是正確的,但是它沒有居中,並且我不知道原因是什么,在這里我向您展示代碼
from PyQt4.QtGui import QPrinter,QPainter,QApplication
from PyQt4.QtCore import Qt,QRectF
import sys
app = QApplication(sys.argv)
printer = QPrinter()
painter = QPainter()
printer.setOutputFileName("prueba.pdf")
printer.setOutputFormat(QPrinter.PdfFormat)
printer.setPageMargins(0.0,0.0,0.0,0.0,1)
printer.setFullPage(True)
margin = printer.getPageMargins(1)
print margin
size = printer.paperSize(1)
width = size.width()
print width
painter.begin(printer)
painter.drawText(QRectF(0.0,0.0,width,50.0),Qt.AlignCenter|Qt.AlignTop,"abcdefghijklmn")
painter.end()
如您所見,我得到了作品集類型點的大小的寬度,並且將作品集的整個寬度放不均勻
QPrinter
使用不同類型的度量單位 :
QPrinter.Unit
此枚舉類型用於指定頁面和紙張尺寸的度量單位。
Constant Value QPrinter.Millimeter 0 QPrinter.Point 1 QPrinter.Inch 2 QPrinter.Pica 3 QPrinter.Didot 4 QPrinter.Cicero 5 QPrinter.DevicePixel 6
當您通過paperSize()
方法獲得尺寸時,您會以QPrinter.Point
單位要求它的大小,但是QPainter
使用以像素為單位的坐標(即QPrinter.DevicePixel
來求解,因此獲得的寬度不同於以像素為單位的寬度如果我們僅更改度量單位的類型,如下所示:
app = QApplication(sys.argv)
printer = QPrinter()
painter = QPainter()
printer.setOutputFileName("prueba.pdf")
printer.setOutputFormat(QPrinter.PdfFormat)
printer.setPageMargins(0.0, 0.0, 0.0, 0.0, QPrinter.Point)
printer.setFullPage(True)
margin = printer.getPageMargins(QPrinter.Point)
print(margin)
size = printer.paperSize(QPrinter.DevicePixel)
width = size.width()
print(width)
painter.begin(printer)
painter.drawText(QRectF(0.0,0.0,width,50.0), Qt.AlignCenter|Qt.AlignTop, "abcdefghijklmn")
painter.end()
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