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pycairo.tar.gz

Pycairo

In this course, you will use Python’s Pycairo library to draw complex shapes. So if you have an appetite for virtual reality, or game development, then this course will serve you well.

You will start with basic concepts like: What is the difference between pixel and vector graphics? After that, you will learn to make basic drawings and then you will move on to complex shapes. Throughout, you will cover important concepts like transform and state, working with text, gradients, and a whole lot more.

By the time you finish this course, you will have a powerful new library at your disposal, and you’ll be able to construct beautiful graphics that users will love.

Computer Graphics in Python and Pycairo

## Radial gradients
A `RadialGradient` is circular in appearance. It is created like this:
```
pattern=RadialGradient(cx0, cy0, r0, cx1, cy1, r1)
```
The radial gradient is defined by two circles:
- Circle0, with centre (cx0, cy0) and radius r0
- Circle1, with centre (cx1, cy1) and radius r1

Similar to linear gradients, these coordinates and lengths are defined in userspace, using whatever
transforms are in place at the time that the `RadialGradient` is called.

In most cases, `Circle0` is contained within `Circle1`, because this creates the most useful effects but, in fact, the two circles can be located anywhere.

A simple case occurs when `Circle0` has a radius of 0 (that is, it is a point) and is located at the center of `Circle1`, like this:


# Radial gradients
A `RadialGradient` is circular in appearance. It is created like this:
```
pattern=RadialGradient(cx0, cy0, r0, cx1, cy1, r1)
```
The radial gradient is defined by two circles:
- Circle0, with centre (cx0, cy0) and radius r0
- Circle1, with centre (cx1, cy1) and radius r1

Similar to linear gradients, these coordinates and lengths are defined in userspace, using whatever
transforms are in place at the time that the `RadialGradient` is called.

In most cases, `Circle0` is contained within `Circle1`, because this creates the most useful effects but, in fact, the two circles can be located anywhere.

A simple case occurs when `Circle0` has a radius of 0 (that is, it is a point) and is located at the center of `Circle1`, like this:


Learn how to use the RadialGradient pattern in Pycairo.

Introduction

Introduction to Vector Graphics

Basic Drawing Operations

Paths and Complex Shapes

Computer Color

Transforms and State

Working with Text

Gradients and Image Fills

Clipping, Masking and Compositing

Surfaces and Output Formats

Integration with Other Libraries

Conclusion

RadialGradient

Radial gradients