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e4e22dee20
After some initial smaller fixes, it turned out that I had broken
the red line used when linking fields. Fixing this was not trivial
as I found myself battling a lot of small bugs relating to scale
and translation in the existing code. This was made extra difficult
as a lot of coordinates were calculated when necessary in
Canvas.jsx.
This commit attempts to simplify the coordinate management in a few
different ways:
* There are now two distinct coordinate systems in use, typically
referred to as "spaces". Screen space and diagram space.
* Diagram space is no longer measured in pixels (though the
dimension-less measure used instead still maps to pixels at 100%
zoom).
* The canvas now exposes helper methods for transforming between
spaces.
* Zoom and translation is now managed via the svg viewBox property.
* This makes moving items in diagram space much easier as the
coordinates remain constant regardless of zoom level.
* The canvas now wraps the current mouse position in a context
object, making mouse movement much easier to work with.
* The transform.pan property now refers to the center of the screen.
A new feature in this commit is that scroll wheel zoom is now based
on the current cursor location, making the diagram more convenient
to move around in.
I have tried to focus on Canvas.jsx and avoid changes that might be
desctructive on existing save files. I also believe more refactors
and abstractions could be introduced based on these changes to make
the diagram even easier to work with. However, I deem that out of
scope for now.
22 lines
523 B
JavaScript
22 lines
523 B
JavaScript
import { createContext, useState } from "react";
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export const UndoRedoContext = createContext({
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undoStack: [],
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setUndoStack: () => {},
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redoStack: [],
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setRedoStack: () => {},
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});
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export default function UndoRedoContextProvider({ children }) {
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const [undoStack, setUndoStack] = useState([]);
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const [redoStack, setRedoStack] = useState([]);
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return (
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<UndoRedoContext.Provider
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value={{ undoStack, redoStack, setUndoStack, setRedoStack }}
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>
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{children}
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</UndoRedoContext.Provider>
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);
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}
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