生成标题："ReportLab 2022版本下的PDF文档生成器API手册简介"

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本报告是关于2022年版的python下的PDF文档生成器reportlab的API手册。ReportLab PDF Library User Guide是一个详细介绍ReportLab PDF库的指南，本文档是在2022年8月29日的20:17:57生成的。 ReportLab是位于英国伦敦SW19 7NB的Wimbletech35 Wimbledon Hill Road公司开发的一个强大而灵活的PDF文档生成库。它为Python程序员提供了生成高质量PDF文档的工具和功能。该手册的目录提供了对文档结构的概览，方便读者快速定位所需的内容。在第1章引言中，介绍了本文档的目的和内容。其中，1.1部分提供了关于本文档的一些基本信息，1.2部分解释了ReportLab PDF Library是什么，它的功能和用途。1.3部分介绍了ReportLab的开发合作伙伴和联系方式。 ReportLab PDF Library是一个功能强大的PDF文档生成工具，它提供了丰富的功能和选项，使用户能够灵活地生成各种类型的PDF文档。它支持创建复杂的布局、添加图像、文本和表格、应用颜色和字体等特性，以满足各种需求。该API手册详细介绍了ReportLab PDF Library的各个模块和类，以及它们的属性和方法。它为用户提供了详细的文档，以便他们了解如何使用库中的各种功能。通过示例代码和详细的说明，用户可以快速上手并有效地使用ReportLab生成PDF文档。除了介绍各个功能模块和类之外，该手册还提供了一些高级示例和技巧，帮助用户更好地理解和使用ReportLab PDF Library。这些示例涵盖了创建自定义页面布局、添加水印、生成条形码等常见任务。总体而言，reportlab的2022版本API手册是一个全面而详尽的指南，以帮助开发人员利用Python生成专业级的PDF文档。它提供了丰富的功能和选项，使用户能够创建出色的PDF文档，满足各种需求。无论是简单的报告还是复杂的文档，ReportLab PDF Library都能够提供强大的支持，并简化用户的工作流程。在本手册中，开发人员可以找到他们需要的所有信息和指导，以便充分利用ReportLab PDF Library的潜力。

Changing Colors

canvas.setFillColorCMYK(c, m, y, k)

canvas.setStrikeColorCMYK(c, m, y, k)

canvas.setFillColorRGB(r, g, b)

canvas.setStrokeColorRGB(r, g, b)

canvas.setFillColor(acolor)

canvas.setStrokeColor(acolor)

canvas.setFillGray(gray)

canvas.setStrokeGray(gray)

PDF supports three different color models: gray level, additive (red/green/blue or RGB), and subtractive with

darkness parameter (cyan/magenta/yellow/darkness or CMYK). The ReportLab packages also provide named

colors such as lawngreen. There are two basic color parameters in the graphics state: the Fill color for

the interior of graphic figures and the Stroke color for the boundary of graphic figures. The above methods

support setting the fill or stroke color using any of the four color specifications.

Changing Fonts

canvas.setFont(psfontname, size, leading = None)

The setFont method changes the current text font to a given type and size. The leading parameter spe-

cifies the distance down to move when advancing from one text line to the next.

Changing Graphical Line Styles

canvas.setLineWidth(width)

canvas.setLineCap(mode)

canvas.setLineJoin(mode)

canvas.setMiterLimit(limit)

canvas.setDash(self, array=[], phase=0)

Lines drawn in PDF can be presented in a number of graphical styles. Lines can have different widths, they

can end in differing cap styles, they can meet in different join styles, and they can be continuous or they can

be dotted or dashed. The above methods adjust these various parameters.

Changing Geometry

canvas.setPageSize(pair)

canvas.transform(a,b,c,d,e,f):

canvas.translate(dx, dy)

canvas.scale(x, y)

canvas.rotate(theta)

User Guide Chapter 2 Graphics and Text with pdfgen

Page 16

canvas.skew(alpha, beta)

All PDF drawings fit into a specified page size. Elements drawn outside of the specified page size are not vis-

ible. Furthermore all drawn elements are passed through an affine transformation which may adjust their loca-

tion and/or distort their appearence. The setPageSize method adjusts the current page size. The

transform, translate, scale, rotate, and skew methods add additional transformations to the cur-

rent transformation. It is important to remember that these transformations are incremental -- a new transform

modifies the current transform (but does not replace it).

State control

canvas.saveState()

canvas.restoreState()

Very often it is important to save the current font, graphics transform, line styles and other graphics state in

order to restore them later. The saveState method marks the current graphics state for later restoration by

a matching restoreState. Note that the save and restore method invokation must match -- a restore call

restores the state to the most recently saved state which hasn't been restored yet. You cannot save the state on

one page and restore it on the next, however -- no state is preserved between pages.

2.6 Other canvas methods.

Not all methods of the canvas object fit into the "tool" or "toolbox" categories. Below are some of the mis-

fits, included here for completeness.

canvas.setAuthor()

canvas.addOutlineEntry(title, key, level=0, closed=None)

canvas.setTitle(title)

canvas.setSubject(subj)

canvas.pageHasData()

canvas.showOutline()

canvas.bookmarkPage(name)

canvas.bookmarkHorizontalAbsolute(name, yhorizontal)

canvas.doForm()

canvas.beginForm(name, lowerx=0, lowery=0, upperx=None, uppery=None)

canvas.endForm()

canvas.linkAbsolute(contents, destinationname, Rect=None, addtopage=1, name=None, **kw)

canvas.linkRect(contents, destinationname, Rect=None, addtopage=1, relative=1, name=None, **kw)

canvas.getPageNumber()

canvas.addLiteral()

canvas.getAvailableFonts()

canvas.stringWidth(self, text, fontName, fontSize, encoding=None)

canvas.setPageCompression(onoff=1)

canvas.setPageTransition(self, effectname=None, duration=1,

direction=0,dimension='H',motion='I')

2.7 Coordinates (default user space)

By default locations on a page are identified by a pair of numbers. For example the pair (4.5*inch,

1*inch) identifies the location found on the page by starting at the lower left corner and moving to the right

4.5 inches and up one inch.

For example, the following function draws a number of elements on a canvas.

def coords(canvas):

from reportlab.lib.units import inch

from reportlab.lib.colors import pink, black, red, blue, green

c = canvas

c.setStrokeColor(pink)

c.grid([inch, 2*inch, 3*inch, 4*inch], [0.5*inch, inch, 1.5*inch, 2*inch, 2.5*inch])

c.setStrokeColor(black)

c.setFont("Times-Roman", 20)

c.drawString(0,0, "(0,0) the Origin")

c.drawString(2.5*inch, inch, "(2.5,1) in inches")

c.drawString(4*inch, 2.5*inch, "(4, 2.5)")

c.setFillColor(red)

User Guide Chapter 2 Graphics and Text with pdfgen

Page 17

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