Table of Contents
PrefaceChapter 1: Start your EnginesChapter 2: Drawing Fundamental ShapesChapter 3: Handling TextChapter 4: Animation PrinciplesChapter 5: The Magic of ColorChapter 6: Working with PicturesChapter 7: Combining Raster and Vector PicturesChapter 8: Data In and Data OutChapter 9: Exchanging Inkscape SVG Drawings with Tkinter ShapesChapter 10: GUI Construction: Part 1Chapter 11: GUI Construction: Part 2Appendix: Quick tips for running Python programs in Microsoft WindowsIndex
Chapter 1: Start your Engines
Running a shortest Python program
Ensuring that the Python modules are present
A basic Tkinter program
Make a compiled executable under Windows and Linux
Chapter 2: Drawing Fundamental Shapes
A straight line and the coordinate system
Draw a dashed line
Lines of varying styles with arrows and endcaps
A two segment line with a sharp bend
A line with a curved bend
Drawing intricate shapes – the curly vine
Draw a rectangle
Draw overlapping rectangles
Draw concentric squares
A circle from an oval
A circle from an arc
Three arc ellipses
A star polygon
Cloning and resizing stars
Chapter 3: Handling Text
Text font type, size, and color
Alignment of text – left and right justify
All the fonts available on your computer
Chapter 4: Animation Principles
Static shifting of a ball
Time-controlled shifting of a ball
Complete animation using draw-move-pause-erase cycles
More than one moving object
A ball that bounces
Bouncing in a gravity field
Precise collisions using floating point numbers
Trajectory tracing and ball-to-ball collisions
Trajectory tracing on multiple line rotations
A rose for you
Chapter 5: The Magic of Color
A limited palette of named colors
Nine ways of specifying color
A red beachball of varying hue
A red color wedge of graded hue
Newton's grand wheel of color mixing
The numerical color mixing matching palette
The animated graded color wheel
Tkinter's own color picker-mixer
Chapter 6: Working with Pictures
Opening an image file and discovering its attributes
Open, view, and save an image in a different file format
Image format conversion for JPEG, PNG, TIFF, GIF, BMP
Image rotation in the plane of the image
Image size alteration
Correct proportion image resizing
Separating one color band in an image
Red, green, and blue color alteration in images
Slider controlled color manipulation
Combining images by blending
Blending images by varying percentages
Make a composite image using a mask image
Offset (roll) image horizontally and vertically
Flip horizontally, vertically, and rotate
Filter effects: blur, sharpen, contrast, and so on
Chapter 7: Combining Raster and Vector Pictures
Simple animation of a GIF beach ball
The vector walking creature
Bird with shoes walking in the Karroo
Making GIF images with transparent backgrounds using GIMP
Diplomat walking at the palace
Spider in the forest
Moving band of images
Continuous band of images
Chapter 8: Data In and Data Out
Creation of a new file on a hard drive
Writing data to a newly-created file
Writing data to multiple files
Adding data to existing files
Saving a Tkinter-drawing shape to disk
Retrieving Python data from disk storage
Simple mouse input
Storing and retrieving a mouse-drawn shape
A mouse-line editor
All possible mouse actions
Chapter 9: Exchanging Inkscape SVG Drawings with Tkinter Shapes
The structure of an SVG drawing
Tracing the shape of an image in Inkscape
Converting an SVG path into a Tkinter Line
Chapter 10: GUI Construction: Part 1
Widget configuration – a label
The simplest push button with validation
A data entry box
Colored button causing a message pop-up
Complex interaction between buttons
Images on buttons and button packing
Grid Geometry Manager and button arrays
Drop-down menus to select from a list
Listbox variable selection
Text in a window
Chapter 11: GUI Construction: Part 2
The Grid Layout Geometry Manager
The Pack Geometry Manager
Radiobuttons to select one from many
Checkbuttons (Tickboxes) to select some of many
Key-stroke event handling
Custom DIY controller widgets
Organizing widgets inside frames
Appendix: Quick tips for running Python programs in Microsoft Windows
Running Python programs in Microsoft Windows
Where will we find the windows installer?
Do we have to use Python version 2.7?
Why do we get "python is not recognized…"?
Mike is a graduate Electrical Engineer specializing in industrial process measurement and control. He has a Diploma in Electronics and Instrumentation from Technikon Witwatersrand, an Electrical Engineering degree from the University of Cape Town, and a Masters in Automatic Control from Rand Afrikaans University. He has worked for mining and mineral extraction companies for the last 30 years. His first encounter with computers was learning Fortran 4 using punched cards on an IBM 360 as an undergraduate. Since then he has experimented with Pascal, Forth, Intel 8080 Assembler, MS Basic, C, and C++ but was never satisfied with any of these. Always restricted by corporate control of computing activities he encountered Linux in 2006 and Python in 2007 and became free at last.
As a working engineer he needs tools that facilitate the understanding and solution of industrial process control problems using simulations and computer models of real processes. Linux and Python proved to be excellent tools for these challenges. When he retires he would like to be part of setting up a Free and Open Source engineering virtual workshop for his countrymen and people in other poor countries to enable the bright youngsters of these countries to be intellectually free at last.
His hobbies are writing computer simulations, paddling kayaks in wild water, and surf skiing in the sea.
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Python is a great object-oriented and interactive programming language that lets you develop graphics, both static and animated, using built-in vector graphics functions that are provided with Python.
Python 2.6 Graphics Cookbook is a collection of straightforward recipes and illustrative screenshots for creating and animating graphic objects using the Python language. This book makes the process of developing graphics interesting and entertaining by working in a graphic workspace without the burden of mastering complicated language definitions and opaque examples.
If you choose to work through all the recipes from the beginning, you will learn to install Python and create basic programs for making lines and shapes using the built-in Tkinter module. The confusing topic of color manipulation is explored in detail using existing Python tools as well as some new tools in the recipes. Next you will learn to manipulate font size, color, and placement of text as placing text exactly where you want on a screen can be tricky because font height, inter-character spacing, and text window dimensions all interfere with each other. Then you will learn how to animate graphics, for example having more than one independent graphic object co-exist and interact using various Python methods.
You will also learn how you can work with raster images, such as converting their formats using the Python Imaging Library. Next you will learn how you can combine vector images with raster images so that you can animate the raster images with ease. You will also walk through a set of recipes with the help of which you can handle and manipulate blocks of raw data that may be hundreds of megabytes in size using datastreams, files, and hard drives. You will also learn how you can use Inkscape to dismantle existing images and use parts of them for your own graphics and Python programs. At the end of the book you will learn how you can create GUIs for different purposes.
A quick reference for creating interesting graphic animations using Python programming
This book has recipes that show enthusiastic users how easy graphic programming can be. Simple explanations in plain English are used. The recipes are built up, in each chapter, starting as simply as possible and moving to more complex programs with which you can comfortably create 2D vector graphics and animations. You will learn how to combine both vector and photo images seamlessly!
If you are looking to create animated graphics to represent real-world scenarios then this book is for you. Teachers, scholars, students, and engineers who know it is possible to make fascinating models and demonstrations but have not found a handbook that pulls it all together in one place will find what they need in this recipe bank.
Basic knowledge of Python programming is required and access to the Web and Google will be useful.
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