- Python 2.6 Graphics Cookbook
- Python 2.6 Graphics Cookbook
- Credits
- About the Author
- About the Reviewers
- Preface
- 1. Start your Engines
- Introduction
- Running a shortest Python program
- How to do it...
- Ensuring that the Python modules are present
- How to do it...
- A basic Tkinter program
- How to do it...
- Make a compiled executable under Windows and Linux
- Getting ready
- How it works...
- 2. Drawing Fundamental Shapes
- Introduction
- 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
- Polygons
- A star polygon
- Cloning and resizing stars
- 3. Handling Text
- 4. Animation Principles
- Introduction
- 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
- Rotating line
- Trajectory tracing on multiple line rotations
- A rose for you
- 5. The Magic of Color
- 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
- 7. Combining Raster and Vector Pictures
- 8. Data In and Data Out
- Introduction
- 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
- 9. Exchanging Inkscape SVG Drawings with Tkinter Shapes
- 10. GUI Construction: Part 1
- Introduction
- Widget configuration a label
- Button focus
- 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
- 11. GUI Construction: Part 2
- appA. Quick tips for running Python programs in Microsoft Windows
In this chapter, we will cover:
- Static shifting of a ball
- Timed shifting of a ball
- Animation timed draw-and-erase cycles
- Two balls moving unimpeded
- A ball that bounces
- Bouncing in a gravitational field
- Colliding balls with tracer trails
- Elastic ball against ball collisions
- Dynamic debugging
- Trajectory tracing
- Rotating a line and vital trigonometry
- Rotating lines which rotate lines
- A digital flower
Animation is about making graphic objects move smoothly around a screen. The method to create the sensation of smooth dynamic action is simple:
Besides the obvious applications of making animated figures move around on a screen for entertainment, animating the results of computer code gives you powerful insights into how code works at a detailed level. Animation offers an extra dimension to the programmers' debugging arsenal. It provides you with an all encompassing, holistic view of software execution in progress that nothing else can.
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