ReportLab PDF 用户指南：高清带详细目录与图形文本操作详解
需积分: 46 186 浏览量
更新于2024-07-18
收藏 545KB PDF 举报
报告Lab PDF库用户指南是一份详细且高清的文档，适用于ReportLab Version 3.4.14，最后更新日期为2017年6月19日。这份文档由ReportLab公司编撰，位于英国伦敦 Wimbledon 的 Thornton House，旨在介绍如何利用ReportLab Python 库进行PDF生成。
该用户指南首先在第一章"Introduction"中，对文档本身进行了简要概述，包括它的目的、关于ReportLab PDF Library的功能和用途，以及与商业软件的关系。对于没有接触过Python的读者，这一章也介绍了Python语言的基本概念，强调了其在文档处理领域的广泛适用性。
接着，第二章"Graphics and Text with pdfgen"深入探讨了在PDF生成中的关键操作。这一部分涵盖了基本概念，如Canvas（一个用于绘制图形和文本的平台），以及如何执行各种绘图操作，如使用"draw"和"state change"工具进行图形构建。此外，还讲解了坐标系统（默认用户空间）、颜色管理（包括颜色空间检查和颜色叠加）、标准字体和文本对象的使用，以及路径、线、矩形、圆形和椭圆等形状的绘制方法。
贝塞尔曲线的使用和Path对象的方法也被详细介绍，这些都是创建复杂图形必不可少的技术。为了帮助用户更深入学习，章节末尾推荐了《ReportLab Graphics》等相关资料，以便进一步探索和实践。
在整个文档中，每章都配有详尽的示例和解释，确保读者能够逐步掌握ReportLab PDF Library的各项功能，并将其应用到实际项目中。无论是初次接触的初学者，还是经验丰富的开发者，这份用户指南都提供了丰富的资源和实用的指导。通过阅读和实践这份指南，用户可以更好地理解和掌握如何使用Python ReportLab库来生成专业级别的PDF文档。
canvas.skew(alpha, beta)
All PDF drawings fit into a specified page size. Elements drawn outside of the specified page size are not
visible. Furthermore all drawn elements are passed through an affine transformation which may adjust their
location 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
current 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
misfits, 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 16
剩余131页未读，继续阅读
点击了解资源详情
点击了解资源详情
点击了解资源详情
2018-11-15 上传
2020-04-07 上传
2022-07-24 上传
2020-04-15 上传
2014-07-13 上传
2022-10-07 上传
hs4601
- 粉丝: 1
- 资源: 12
我的内容管理
展开
