Python 2.6 Graphics Cookbook电子书

Python 2.6 Graphics Cookbook

Table of Contents

Python 2.6 Graphics Cookbook

Credits

About the Author

About the Reviewers

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Errata

Piracy

Questions

1. Start your Engines

Introduction

Running a shortest Python program

How to do it...

How it works...

There's more...

Ensuring that the Python modules are present

How to do it...

How it works...

There's more...

A basic Tkinter program

How to do it...

How it works...

Make a compiled executable under Windows and Linux

Getting ready

How to do it under MS Windows...

How to do it under Linux (Debian and Ubuntu)...

How to compile under both Linux and MS Windows...

How it works...

2. Drawing Fundamental Shapes

Introduction

A straight line and the coordinate system

How to do it...

How it works...

There's more...

Draw a dashed line

How to do it...

How it works...

There's more...

Lines of varying styles with arrows and endcaps

How to do it...

How it works...

There's more...

A two segment line with a sharp bend

How to do it...

How it works...

There's more...

A line with a curved bend

How to do it...

How it works...

There's more...

Drawing intricate shapes – the curly vine

Getting ready

How to do it…

How it works...

There's more...

Draw a rectangle

How to do it...

How it works...

There's more...

Draw overlapping rectangles

How to do it...

How it works...

There's more...

Draw concentric squares

How to do it...

How it works...

A circle from an oval

How to do it...

How it works...

There's more...

A circle from an arc

How to do it...

How it works...

There's more...

Three arc ellipses

How to do it...

How it works...

There's more...

Polygons

How to do it...

How it works...

A star polygon

How to do it...

How it works...

Cloning and resizing stars

How to do it...

How it works...

There's more...

3. Handling Text

Introduction

Simple text

How to do it...

How it works...

There's more...

Text font type, size, and color

Getting ready

How to do it...

How it works...

There's more...

Getting ready

How to do it...

How it works...

Alignment of text – left and right justify

Getting ready

How to do it...

How it works...

All the fonts available on your computer

How to do it...

How it works...

4. Animation Principles

Introduction

Static shifting of a ball

How to do it...

How it works...

There's more...

Time-controlled shifting of a ball

How to do it...

How it works...

There's more...

The robustness of Tkinter

Complete animation using draw-move-pause-erase cycles

How to do it...

How it works...

There's more...

More than one moving object

How to do it...

How it works...

There's more...

A ball that bounces

How to do it...

How it works...

Bouncing in a gravity field

How to do it...

How it works...

There's more...

See also

Precise collisions using floating point numbers

How to do it...

How it works...

A graphic debugging tool...

Trajectory tracing and ball-to-ball collisions

How to do it...

How it works...

There's more...

Why do we sometimes get tkinter.TckErrors?

Rotating line

Getting ready

How to do it...

How it works...

There's more...

Trajectory tracing on multiple line rotations

Getting ready

How to do it...

How it works...

There's more...

A rose for you

How it works...

5. The Magic of Color

Introduction

A limited palette of named colors

How to do it...

How it works...

There's more...

To get fine shadings of the primary colors

A more compact color list

Nine ways of specifying color

How to do it...

How it works...

Converting color tuples to Tkinter Hex compatible specifiers

A red beachball of varying hue

How to do it...

How it works...

There's more...

A red color wedge of graded hue

How to do it...

How it works...

There's more...

Newton's grand wheel of color mixing

How to do it...

How it works...

There's more...

The numerical color mixing matching palette

How to do it...

How it works...

There's more...

There are other tools to select colors

Is there a way to make neater slide controllers?

The animated graded color wheel

How to do it...

How it works...

Tkinter's own color picker-mixer

How to do it...

How it works...

There's more...

6. Working with Pictures

Opening an image file and discovering its attributes

Getting ready

How to do it...

How it works...

There's more...

Things we need to know about image formats

Images and the numbers game

Open, view, and save an image in a different file format

Getting ready

How to do it...

How it works...

There's more...

Image format conversion for JPEG, PNG, TIFF, GIF, BMP

Getting ready

How to do it...

How it works...

There's more...

Does size count?

Image rotation in the plane of the image

Getting ready

How to do it...

How it works...

There's more...

Image size alteration

Getting ready

How to do it...

How it works...

There's more...

How do we preserve the correct height-to-width ratio of an image?

Correct proportion image resizing

Getting ready

How to do it...

How it works...

Separating one color band in an image

Getting ready

How to do it...

How it works...

There's more...

Red, green, and blue color alteration in images

Getting ready

How to do it...

How it works...

There's more...

Slider controlled color manipulation

Getting ready

How to do it...

How it works...

Combining images by blending

Getting ready

How to do it...

There's more...

More Info Section 1

Blending images by varying percentages

How to do it...

How it works...

There's more...

Make a composite image using a mask image

Getting ready

How to do it...

How it works...

There's more...

See also

Offset (roll) image horizontally and vertically

Getting ready

How to do it...

How it works...

Flip horizontally, vertically, and rotate

Getting ready

How to do it...

How it works...

Filter effects: blur, sharpen, contrast, and so on

Getting ready

How to do it...

How it works...

Getting ready

How to do it...

How it works...

There's more...

7. Combining Raster and Vector Pictures

Simple animation of a GIF beach ball

Getting ready

How to do it...

How it works...

The vector walking creature

Getting ready

How to do it...

How it works...

There's more...

More Info Section 1

Bird with shoes walking in the Karroo

Getting ready

How to do it...

How it works...

There's more...

Making GIF images with transparent backgrounds using GIMP

Getting ready

How to do it...

How it works...

Diplomat walking at the palace

Getting ready

How to do it...

How it works...

Spider in the forest

Getting ready

How to do it...

How it works...

There's more...

Moving band of images

Getting ready

How to do it...

How it works...

Continuous band of images

Getting ready

How to do it...

How it works...

Endless background

Getting ready

How to do it...

How it works...

8. Data In and Data Out

Introduction

Creation of a new file on a hard drive

How to do it...

How it works...

How to read the newly created file

Writing data to a newly-created file

How it works...

Writing data to multiple files

How it works...

Adding data to existing files

How it works...

So remember the difference between write and append

Saving a Tkinter-drawing shape to disk

Getting ready

How to do it...

How it works...

Retrieving Python data from disk storage

Getting ready

How it works...

Simple mouse input

How it works...

There's more...

Storing and retrieving a mouse-drawn shape

Getting ready

How it works...

There's more...

We need to edit mistakes

A mouse-line editor

Getting ready

How it works...

There's more...

Why don't we add more features?

Using other tools to acquire and re-work images

How to exploit that mouse

We can measure the distance along a meandering line

All possible mouse actions

How to do it...

How it works...

There's more...

9. Exchanging Inkscape SVG Drawings with Tkinter Shapes

Introduction

The structure of an SVG drawing

Getting ready

How to do it...

How it works...

There's more...

SVG code for separate paths

Tracing the shape of an image in Inkscape

Getting ready

How to do it...

Another way to get SVG paths from raster images

Converting an SVG path into a Tkinter Line

Getting ready

How to do it...

How it works...

There's more...

How far should we go with image conversion code?

Another way to get SVG paths from raster images

10. GUI Construction: Part 1

Introduction

Widget configuration – a label

How to do it...

How it works...

There's more...

Button focus

How to do it...

How it works...

There's more...

The simplest push button with validation

How to do it...

How it works...

There's more...

Buttons behave differently on Windows

A data entry box

How to do it...

How it works...

There's more...

Did we keep things simple?

Single-line versus multi-line entry

The Clever Geometry Manager

Colored button causing a message pop-up

How to do it...

How it works...

Complex interaction between buttons

How to do it...

How it works...

Images on buttons and button packing

How to do it...

How it works...

There's more...

Grid Geometry Manager and button arrays

How to do it...

How it works...

There's more...

Drop-down menus to select from a list

How to do it...

How it works...

Listbox variable selection

How to do it...

How it works...

Text in a window

How to do it...

How it works...

11. GUI Construction: Part 2

Introduction

The Grid Layout Geometry Manager

Getting ready

How to do it...

How it works...

There's more...

The Pack Geometry Manager

Getting ready

How to do it...

How it works...

Radiobuttons to select one from many

How to do it...

How it works...

Checkbuttons (Tickboxes) to select some of many

How to do it...

How it works...

Key-stroke event handling

How to do it...

How it works...

Scrollbar

How to do it...

How it works...

There's more...

Custom DIY controller widgets

How to do it...

How it works...

There's more...

Organizing widgets inside frames

How to do it...

How it works...

There's more...

A. 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…"?

Index