rotated text in reportlabs

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本文介绍如何使用ReportLab库在PDF中实现文本旋转效果，并提供了一个简单的示例代码，展示了如何通过saveState、translate、rotate等方法来绘制带有旋转文本的图表。

if you want to make a great chart like the one below in reportlab, you need rotated text.it isn't very complicated - its just a bit hard to find som examples on the net.

the canvas in reportlab has a saveState and a restoreState method, and supports rotate and translate similarto openGL or processing. see the code example below who it is done.

chart with rotated lables

from reportlab.pdfgen import canvas

from reportlab.lib.units import cm

c = canvas.Canvas("rotate.pdf")

c.line( 2*cm, 21*cm, 2*cm, 16*cm)
c.line( 2*cm, 16*cm, 11*cm, 16*cm )

c.setFillColorRGB( 0, 0, 1 )
c.rect( 2.5*cm, 16*cm, 1.5*cm, 3*cm, fill = 1 )
c.setFillColorRGB( 0, 1, 0 )
c.rect( 4.5*cm, 16*cm, 1.5*cm, 4*cm, fill = 1 )
c.setFillColorRGB( 1, 0, 0 )
c.rect( 6.5*cm, 16*cm, 1.5*cm, 2*cm, fill = 1 )

c.setFillColorRGB( 0, 0, 0 )

i=0
for str in ["blue", "green", "red"]:
    c.saveState()
    c.translate( (i + 3.5) * cm, 15.5 * cm )
    c.rotate( 45 )
    c.drawRightString( 0, 0, str )
    c.restoreState()
    i += 2

c.showPage()
c.save()

引自：http://www.local-guru.net/blog/2009/4/9/rotated-text-in-reportlabs