matrix_gesture_detector

A gesture detector which detects translation, scale and rotation gestures and combines them into Matrix4 object that can be used by Transform widget or by low level CustomPainter code. You can customize types of reported gestures by passing shouldTranslate, shouldScale and shouldRotate parameters.

Getting Started

The usage is as follows:

  MatrixGestureDetector(
    onMatrixUpdate: (Matrix4 m, Matrix4 tm, Matrix4 sm, Matrix4 rm) {
      setState(() {
        matrix = m;
      });
    },
    child: SomeWidgetThatUsesMatrix(
      matrix: matrix,
      ...
    )
  )

here: SomeWidgetThatUsesMatrix could be a Transform widget (transform_demo.dart) or a CustomPaint widget which CustomPainter uses Matrix4 in its low level drawing code (custom_painter_demo.dart).

Libraries

matrix_gesture_detector

Dart

dart:ui
Built-in types and core primitives for a Flutter application. [...]

Core

dart:async
Support for asynchronous programming, with classes such as Future and Stream. [...]
dart:collection
Classes and utilities that supplement the collection support in dart:core. [...]
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dart:core
Built-in types, collections, and other core functionality for every Dart program. [...]
dart:developer
Interact with developer tools such as the debugger and inspector. [...]
dart:math
Mathematical constants and functions, plus a random number generator. [...]
dart:typed_data
Lists that efficiently handle fixed sized data (for example, unsigned 8 byte integers) and SIMD numeric types. [...]

VM

dart:io
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dart:isolate
Concurrent programming using isolates: independent workers that are similar to threads but don't share memory, communicating only via messages. [...]