doodle/pkg/drawtool/shapes.go

package drawtool

// Shape of a stroke line.
type Shape int

// Shape values.
const (
	Freehand Shape = iota
	Line
	Rectangle
	Ellipse
	Eraser // not really a shape but communicates the intention
)
Drawing Strokes and Undo/Redo Functionality * Add new pkg/drawtool with utilities to abstract away drawing actions into Strokes and track undo/redo History for them. * The freehand Pencil tool in EditorMode has been refactored to create a Stroke of Shape=Freehand and queue up its world pixels there instead of directly modifying the level chunker in real time. When the mouse button is released, the freehand Stroke is committed to the level chunker and added to the UndoHistory. * UndoHistory is (temporarily) stored with the level.Level so it can survive trips to PlayScene and back, but is not stored as JSON on disk. * Ctrl-Z and Ctrl-Y in EditorMode for undo and redo, respectively. 2019-07-03 23:22:30 +00:00			`package drawtool`

			`// Shape of a stroke line.`
			`type Shape int`

			`// Shape values.`
			`const (`
			`Freehand Shape = iota`
			`Line`
			`Rectangle`
Lemon-shaped Ellipse Tool (WIP) * Add initial Ellipse Tool to the Editor Mode. Currently there's something wrong with the algorithm and the ellipses have a sort of 'lemon shape' to them. * Refactor the IterLine/IterLine2 functions to be more consistent. IterLine used to be the raw algorithm that took a bunch of coordinate numbers and IterLine2 took two render.Point's and was the main one used throughout the app. Now, IterLine takes the two Points and the raw algorithm function removed. 2019-07-14 21:18:44 +00:00			`Ellipse`
Eraser Tool, Brush Sizes * Implement Brush Sizes for drawtool.Stroke and add a UI to the tools panel to control the brush size. * Brush sizes: 1, 2, 4, 8, 16, 24, 32, 48, 64 * Add the Eraser Tool to editor mode. It uses a default brush size of 16 and a max size of 32 due to some performance issues. * The Undo/Redo system now remembers the original color of pixels when you change them, so that Undo will set them back how they were instead of deleting the pixel entirely. Due to performance issues, this only happens when your Brush Size is 0 (drawing single-pixel shapes). * UI: Add an IntVariable option to ui.Label to bind showing the value of an int reference. Aforementioned performance issues: * When we try to remember whole rects of pixels for drawing thick shapes, it requires a ton of scanning for each step of the shape. Even de-duplicating pixel checks, tons of extra reads are constantly checked. * The Eraser is the only tool that absolutely needs to be able to remember wiped pixels AND have large brush sizes. The performance sucks and lags a bit if you erase a lot all at once, but it's a trade-off for now. * So pixels aren't remembered when drawing lines in your level with thick brushes, so the Undo action will simply delete your pixels and not reset them. Only the Eraser can bring back pixels. 2019-07-12 02:07:46 +00:00			`Eraser // not really a shape but communicates the intention`
Drawing Strokes and Undo/Redo Functionality * Add new pkg/drawtool with utilities to abstract away drawing actions into Strokes and track undo/redo History for them. * The freehand Pencil tool in EditorMode has been refactored to create a Stroke of Shape=Freehand and queue up its world pixels there instead of directly modifying the level chunker in real time. When the mouse button is released, the freehand Stroke is committed to the level chunker and added to the UndoHistory. * UndoHistory is (temporarily) stored with the level.Level so it can survive trips to PlayScene and back, but is not stored as JSON on disk. * Ctrl-Z and Ctrl-Y in EditorMode for undo and redo, respectively. 2019-07-03 23:22:30 +00:00			`)`