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CHAPTER 21 ■ PROJECT 2: PAINTING A PRETTY PICTURE 413 Here is a part of the file to give you an idea of how the data looks: # Predicted Sunspot Number And Radio Flux Values # With Expected Ranges # # -----Sunspot Number------ ----10.7 cm Radio Flux---- # YR MO PREDICTED HIGH LOW PREDICTED HIGH LOW #-------------------------------------------------------------- 2004 12 34.2 35.2 33.2 100.6 101.6 99.6 2005 01 31.5 34.5 28.5 97.8 100.8 94.8 2005 02 28.8 33.8 23.8 94.5 99.5 89.5 2005 03 27.1 34.1 20.1 91.8 98.8 84.8 2005 04 24.9 32.9 16.9 89.2 98.2 80.2 2005 05 22.0 31.0 13.0 86.2 97.2 75.2 2005 06 20.3 30.3 10.3 83.6 96.6 70.6 2005 07 19.1 30.1 8.1 81.4 96.4 66.4 2005 08 17.4 29.4 5.4 79.1 96.1 62.1 2005 09 15.8 28.8 2.8 77.2 96.2 58.2 First Implementation In this first implementation, let’s just put the data into our source code, as a list of tuples. That way, it’s easily accessible. Here is an example of how you can do it: data = [ # Year Month Predicted High Low (2004, 12, 34.2, 35.2, 33.2), (2005, 1, 31.5, 34.5, 28.5), # Add more data here ] With that out of the way, let’s see how you can turn the data into graphics. Drawing with ReportLab ReportLab consists of many parts and enables you to create output in several ways. The most basic module for generating PDFs is pdfgen. It contains a Canvas class with several low-level methods for drawing. To draw a line on a Canvas called c, you call the c.line method, for example. We’ll use the more high-level graphics framework (in the package reportlab.graphics and its submodules), which will enable us to create various shape objects and to add them to a Drawing object that we can later output to a file in PDF format. Listing 21-1 shows a sample program that draws the string “Hello, world!” in the middle of a 100×100-point PDF figure. (You can see the result in Figure 21-1.) The basic structure is as follows: You create a drawing of a given size, you create graphical elements (in this case, a String object) with certain properties, and then you add the elements to the drawing. Finally, the drawing is rendered into PDF and is saved to a file.
414 CHAPTER 21 ■ PROJECT 2: PAINTING A PRETTY PICTURE Listing 21-1. A Simple ReportLab Program from reportlab.graphics.shapes import Drawing, String from reportlab.graphics import renderPDF d = Drawing(100, 100) s = String(50, 50, 'Hello, world!', textAnchor='middle') d.add(s) renderPDF.drawToFile(d, 'hello.pdf', 'A simple PDF file') The call to renderPDF.drawToFile saves your PDF file to a file called hello.pdf in the current directory. The main arguments to the String constructor are its x and y coordinates and its text. In addition, you can supply various attributes (such as font size, color, and so on). In this case, I’ve supplied a textAnchor, which is the part of the string that should be placed at the point given by the coordinates. ■Note When you run this program, you may get two warnings: one saying that the Python Imaging Library is not available, and the other that zlib is not available. (If you have installed either of these, that warning will, of course, not appear.) You won’t need either of these libraries for the code in this project, so you can simply ignore the warnings. Figure 21-1. A simple ReportLab figure
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Beginning Python From Novice to Pro
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For Ranveig
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■CHAPTER 23 Project 4: In the New
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viii ■CONTENTS Strings . . . . .
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x ■CONTENTS ■CHAPTER 5 Conditio
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xxii ■CONTENTS Preparations . . .
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About the Technical Reviewer ■JER
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Introduction A C program is like a
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CHAPTER 1 ■ ■ ■ Instant Hacki
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CHAPTER 9 ■ MAGIC METHODS, PROPER
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256 CHAPTER 11 ■ FILES AND STUFF
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270 CHAPTER 12 ■ GRAPHICAL USER I
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572 APPENDIX C ■ ONLINE RESOURCES
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Index ■Symbols - operator 558 !=
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