111 lines
4.1 KiB
TypeScript
111 lines
4.1 KiB
TypeScript
import { commandIds } from "@commands/ids";
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import type { ImageDocument } from "@core/document";
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import type { Vec2D } from "@core/geometry";
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import type { Layer } from "@core/layer";
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import type { RasterLayer } from "@core/raster-layer";
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import type { EditorState } from "@editor/state";
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import type { AppStore } from "@editor/store";
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export type BrushSession = {
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layerId: string;
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previousPoint: Vec2D;
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mode: "brush" | "eraser";
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};
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export function beginBrushSession(document: ImageDocument, editor: EditorState, point: Vec2D): BrushSession | undefined {
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if (editor.tools.activeTool !== "brush" && editor.tools.activeTool !== "eraser") return undefined;
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const layerId = editor.selection.layerIds[0];
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if (!layerId) return undefined;
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const layer = findRasterLayer(document.artboards.flatMap((artboard) => artboard.layers), layerId);
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if (!layer || layer.locked || !layer.visible) return undefined;
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return { layerId, previousPoint: point, mode: editor.tools.activeTool };
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}
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export async function updateBrushSession(options: {
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store: AppStore;
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session: BrushSession;
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point: Vec2D;
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color?: string;
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size?: number;
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}): Promise<BrushSession> {
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const state = options.store.getState();
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const layer = findRasterLayer(state.document.artboards.flatMap((artboard) => artboard.layers), options.session.layerId);
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if (!layer) return { ...options.session, previousPoint: options.point };
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const asset = state.document.assets.find((candidate) => candidate.id === layer.assetId);
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if (!asset) return { ...options.session, previousPoint: options.point };
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const source = await drawStroke({
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source: asset.source,
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width: asset.intrinsicSize.w,
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height: asset.intrinsicSize.h,
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from: documentPointToAssetPoint(options.session.previousPoint, layer, asset.intrinsicSize.w, asset.intrinsicSize.h),
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to: documentPointToAssetPoint(options.point, layer, asset.intrinsicSize.w, asset.intrinsicSize.h),
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color: options.color ?? "#111827",
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size: options.size ?? 8,
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mode: options.session.mode,
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});
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options.store.dispatch(commandIds.documentUpdateAssetSource, { assetId: asset.id, source });
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return { ...options.session, previousPoint: options.point };
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}
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function documentPointToAssetPoint(point: Vec2D, layer: RasterLayer, width: number, height: number): Vec2D {
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return {
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x: ((point.x - layer.transform.position.x) / Math.max(0.0001, layer.transform.scale.x) / width) * width,
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y: ((point.y - layer.transform.position.y) / Math.max(0.0001, layer.transform.scale.y) / height) * height,
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};
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}
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async function drawStroke(options: {
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source: string;
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width: number;
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height: number;
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from: Vec2D;
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to: Vec2D;
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color: string;
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size: number;
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mode: "brush" | "eraser";
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}) {
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const canvas = document.createElement("canvas");
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canvas.width = Math.max(1, Math.round(options.width));
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canvas.height = Math.max(1, Math.round(options.height));
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const context = canvas.getContext("2d");
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if (!context) return options.source;
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const image = await loadImage(options.source);
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context.drawImage(image, 0, 0, canvas.width, canvas.height);
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context.globalCompositeOperation = options.mode === "eraser" ? "destination-out" : "source-over";
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context.strokeStyle = options.color;
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context.lineWidth = options.size;
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context.lineCap = "round";
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context.lineJoin = "round";
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context.beginPath();
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context.moveTo(options.from.x, options.from.y);
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context.lineTo(options.to.x, options.to.y);
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context.stroke();
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context.globalCompositeOperation = "source-over";
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return canvas.toDataURL("image/png");
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}
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function loadImage(source: string) {
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return new Promise<HTMLImageElement>((resolve, reject) => {
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const image = new Image();
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image.onload = () => resolve(image);
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image.onerror = () => reject(new Error("Failed to load raster layer"));
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image.src = source;
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});
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}
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function findRasterLayer(layers: Layer[], layerId: string): RasterLayer | undefined {
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for (const layer of layers) {
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if (layer.id === layerId && layer.type === "raster") return layer;
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if (layer.type === "group") {
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const child = findRasterLayer(layer.children, layerId);
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if (child) return child;
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}
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}
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return undefined;
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}
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