A flutter package with classes to help testing applications using the canvas

Related tags

Utilities canvas_test
Overview

Canvas test helpers

MockCanvas is a utility class for writing tests for canvas operations. It supports the same API as the regular Canvas class from dart:ui (in theory; any missing commands can be added as the need arises). In addition, this class is also a Matcher, allowing it to be used in expect() calls as can be seen in the example below.

Two mock canvases will match only if they have the same number of commands, and if each pair of corresponding commands matches.

Multiple transform commands (translate(), scale(), rotate() and transform()) that are issued in a row are always joined into a single combined transform. Thus, for example, calling translate(10, 10) and then translate(30, -10) will match a single call translate(40, 0).

Some commands can be partially specified. For example, in drawLine() and drawRect() the paint argument is optional. If provided, it will be checked against the actual Paint used, but if omitted, the match will still succeed.

Commands that involve numeric components (i.e. coordinates, dimensions, etc) will be matched approximately, with the default absolute tolerance of 1e-10.

Example Usage

final canvas = MockCanvas();
// ... draw something on the canvas
// then check that the commands issued were the ones that you'd expect:
expect(
  canvas,
  MockCanvas()
    ..translate(10, 10)
    ..drawRect(const Rect.fromLTWH(0, 0, 100, 100)),
);
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Comments
  • Implement save and restore functions on mock canvas so their effects can be tested

    Implement save and restore functions on mock canvas so their effects can be tested

    I'm writing a PR on flame to fix an issue I found where components are not properly rendered in priority order if they are HUD. Since that involves checking if the camera is applied or not, I am modifying this so that not only the save/restore count as number is saved, but the transformations are actually applied.

    This has small implications to all our other existing tests, basically because of two things:

    1. we always clear up the camera at the end of the render phase, which requires a new assertion for tests using matchExactly: before:
     .. camera is set
 .. your render checks

    after:

     .. camera is set
 .. your render checks
 .. camera is cleared
    1. since we collapse adjacent transform operations, in some camera tests we were not actually rendering any component, and just checking that the camera transform is applied; however due to the collapse and my optimization on the render flow, the camera was no longer applied needlessly, so all camera tests had to be modified to actually have a component (most already had)

    For the context of how this is used, check https://github.com/flame-engine/flame/pull/1148

    opened by luanpotter 0
Releases(0.1.1)
Owner
Blue Fire
Team working on open source packages and plugins for Flutter, like Flame, Audioplayers, Photo View among others.
Blue Fire
GitHub
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