cairodart 0.2.2

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  • CHANGELOG.md
  • Installing
  • Versions
  • 31

CairoDart

The goal of this project is to provide Dart language bindings for Cairo 2D graphics library (http://cairographics.org/).<br> Current binding supports Cairo v1.12.

Building

First of all you should install Cairo library on your machine.<br> For installation details see (http://cairographics.org/download/)

CairoDart provides API around native library, so the "glue" code should be compiled before start working with CairoDart.

QMake is used for building native part of cairodart, so it should be installed prior to building.

Also environment variable DART_SDK should be set to location of installed Dart SDK.

$ cd native
$ qmake
$ make

Starting unit tests

First start

$ pub get

from the root of the project tree.

To start unit tests run following command:

$ dart test/all_test.dart

Examples

You can find examples in example directory of the project.

Here is an example of CairoDart script that generates several 2D shapes:

library cairodart.example;

import 'dart:io';
import 'dart:math';

import 'package:cairodart/cairodart.dart';

main() {
  Directory dir = Directory.systemTemp.createTempSync('cairodart');

  var filePath = 'example${Platform.pathSeparator}filled_shapes.png';

  File file = new File(filePath);
  file.createSync();

  Surface surface = new ImageSurface(Format.ARGB32, 400, 200);
  Context ctx = new Context(surface);

  ctx.lineWidth = 1.0;

  // Red circle
  ctx..translate(150, 100)
     ..setSourceRgb(0, 0, 0)
     ..arc(0, 0, 50, 0, 2 * PI)
     ..strokePreserve()
     ..setSourceRgba(1, 0, 0, 0.7)
     ..fill();

  // Green circle
  ctx..translate(50, 0)
    ..setSourceRgb(0, 0, 0)
    ..arc(0, 0, 50, 0, 2 * PI)
    ..strokePreserve()
    ..setSourceRgba(0, 1, 0, 0.7)
    ..fill();

  // Blue circle
  ctx..translate(-25, 50)
    ..setSourceRgb(0, 0, 0)
    ..arc(0, 0, 50, 0, 2 * PI)
    ..strokePreserve()
    ..setSourceRgba(0, 0, 1, 0.7)
    ..fill();

  // Save to png file
  surface.writeTo(filePath);

}

Now a little example with transparency:

library cairodart.example;

import 'dart:io';

import 'package:cairodart/cairodart.dart';

main() {
  Directory dir = Directory.systemTemp.createTempSync('cairodart');

  var filePath = 'example/${Platform.pathSeparator}transparency.png';

  File file = new File(filePath);
  file.createSync();

  Surface surface = new ImageSurface(Format.ARGB32, 350, 350);
  Context ctx = new Context(surface);

  ctx.translate(10, 175);

  for (int i = 0; i < 10; i++) {
    ctx.translate(25, 0);
    var rect = new Rectangle(0, -10, 20, 20);
    ctx.rectangle(rect);
    ctx.setSourceRgba(0, 1, 0, 0.1 * i);
    ctx.fill();
  }

  // Save to png file
  surface.writeTo(filePath);
}

Not implemented features

The first version of CairoDart provides binaries for Linux only. Binries for Windows and Mac OS will be available in future versions.

The first version of CairoDart does not provide bindings for the following features:

  • Xlib Surfaces
  • Win32 Surfaces
  • XCB Surfaces
  • Quartz Surfaces
  • XLib-XRender Backend
  • Quartz (CGFont) Fonts
  • Win32 Fonts
  • FreeType Fonts

All these features are expected to be implemented in future versions.

Bugs

If you find a bug please register new issue with bug description, code example and version of library.<br> But before you do this please check if this bug is already registered.

Contribution

Help is much appreciated!<br> Before submitting pull request please ensure that you changes does not brake old unit tests and covered by new.

v0.1.0

Implemented features for drawing on PNG,PDF,SVG and PostScript surfaces.

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  cairodart: "^0.2.2"

2. Install it

You can install packages from the command line:

with pub:


$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:cairodart/cairodart.dart';
        
Version Uploaded Documentation Archive
0.2.2 Aug 30, 2016 Go to the documentation of cairodart 0.2.2 Download cairodart 0.2.2 archive
0.2.1 Aug 24, 2016 Go to the documentation of cairodart 0.2.1 Download cairodart 0.2.1 archive
0.2.0 Aug 24, 2016 Go to the documentation of cairodart 0.2.0 Download cairodart 0.2.0 archive
0.1.0 Aug 11, 2015 Go to the documentation of cairodart 0.1.0 Download cairodart 0.1.0 archive

Analysis

This feature is new.
We welcome feedback.
More details: scoring.

We analyzed this package, and provided a score, details, and suggestions below.

  • tool failures on Feb 16, 2018
  • Dart: 2.0.0-dev.20.0
  • pana: 0.10.1

Scores

Popularity:
Describes how popular the package is relative to other packages. [more]
0 / 100
Health:
Code health derived from static analysis. [more]
74 / 100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
45 / 100
Overall score:
Weighted score of the above. [more]
31

Platforms

Detected platforms: other

Primary library: package:cairodart/cairodart.dart with components: nativewrappers.

Suggestions

  • Fix lib/src/line_cap.dart.

    Strong-mode analysis of lib/src/line_cap.dart failed with the following error:

    line: 45 col: 3
    Invalid override. The type of '_LineCap.==' ('(LineCap) → bool') isn't a subtype of 'Object.==' ('(dynamic) → bool').

  • Fix lib/src/subpixel_order.dart.

    Strong-mode analysis of lib/src/subpixel_order.dart failed with the following error:

    line: 53 col: 3
    Invalid override. The type of '_SubpixelOrder.==' ('(SubpixelOrder) → bool') isn't a subtype of 'Object.==' ('(dynamic) → bool').

  • Fix further 37 Dart files.

    Similar analysis of the following files failed:

    • lib/src/device_type.dart
    • lib/src/text_extents.dart
    • lib/src/line_join.dart
    • lib/src/operator.dart
    • lib/src/font_slant.dart
    • lib/src/context.dart
    • lib/src/content.dart
    • lib/src/font_type.dart
    • lib/src/surface.dart
    • lib/src/point.dart
    • lib/src/surface_type.dart
    • lib/src/pdf_version.dart
    • lib/src/text_cluster.dart
    • lib/src/pattern_type.dart
    • lib/src/font_extents.dart
    • lib/src/rectangle.dart
    • lib/src/cairoexception.dart
    • lib/src/region_overlap.dart
    • lib/src/pattern.dart
    • lib/src/hint_style.dart
    • lib/src/hint_metrics.dart
    • lib/src/extend.dart
    • lib/src/font_weight.dart
    • lib/src/matrix.dart
    • lib/src/filter.dart
    • lib/src/dash.dart
    • lib/src/font_options.dart
    • lib/src/path_element_type.dart
    • lib/src/postscript_level.dart
    • lib/src/distance.dart
    • lib/src/antialias.dart
    • lib/src/region.dart
    • lib/src/glyph.dart
    • lib/src/text_cluster_flags.dart
    • lib/src/fill_rule.dart
    • lib/src/color.dart
    • lib/src/svg_version.dart
  • Fix issues reported by dartanalyzer.

    dartanalyzer reported 3 error(s) and 0 warning(s).

  • The description is too short.

    Add more detail about the package, what it does and what is its target use case. Try to write at least 60 characters.

  • Package is pre-v1 release.

    While there is nothing inherently wrong with versions of 0.*.*, it usually means that the author is still experimenting with the general direction API.

  • Maintain an example.

    None of the files in your example/ directory matches a known example patterns. Common file name patterns include: main.dart, example.dart or you could also use cairodart.dart.

Dependencies

Package Constraint Resolved Available
Dev dependencies
test any