On 2022-04-07 20:28, Israel Brewster wrote:
Using Qt 5.15 and PySide2, I am working on a project that requires me
to produce a PDF output. My process so far is to create a QWidget
containing the content I want, render it to a QPicture (so it won’t be
rasterized upon “printing”), then create a PDF QPrinter and use the
painter.drawPicture() function to “print” the widget into a PDF.
This works well, giving me a high-quality vectorized PDF output, with
one exception: any item that is filled with a gradient. When printing
to PDF, the gradient always comes out as solid white. With some
digging, I determined that this is even the case when doing nothing
but a simple painter.fillRect() with a gradient.
Is there any “fix” for this? Thanks.
If it helps, here is some simple code that reproduces the issue:
from PySide2.QtWidgets import QApplication
from PySide2.QtGui import QPainter, QPageSize, QLinearGradient
from PySide2.QtPrintSupport import QPrinter
from PySide2.QtCore import QSize, QRect, Qt
app = QApplication()
gradient_rect = QRect(0, 0, 500, 25)
gradient = QLinearGradient(0, 0, 1, 0)
gradient.setColorAt(0, Qt.blue)
gradient.setColorAt(1, Qt.red)
page_size = QPageSize(QSize(500, 25), matchPolicy = QPageSize.ExactMatch)
printer = QPrinter()
printer.setOutputFormat(QPrinter.PdfFormat)
printer.setPageSize(page_size)
printer.setOutputFileName('/tmp/testPDFGradient.pdf')
painter = QPainter(printer)
painter.fillRect(gradient_rect, gradient)
painter.end()
Hi, try
...
gradient_rect = QRect(0, 0, 500, 25)
gradient = QLinearGradient(0, 0, 500, 25)
gradient.setColorAt(0, Qt.blue)
gradient.setColorAt(1, Qt.red)
...
(i.e. QLinearGradient's ctor expects coords)
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