e1ed40be65
If you scroll and draw to the left of the origin, when you export the scene, there's a weird whitespace on the right. This is because we do the min() computation starting at 0 and not -Infinity This also fixes pasted elements and scrollbars.
67 lines
1.9 KiB
TypeScript
67 lines
1.9 KiB
TypeScript
import rough from "roughjs/bin/rough";
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import { ExcalidrawElement } from "../element/types";
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import { getElementAbsoluteCoords } from "../element/bounds";
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import { renderScene } from "../renderer/renderScene";
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import { distance } from "../utils";
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export function getExportCanvasPreview(
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elements: readonly ExcalidrawElement[],
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{
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exportBackground,
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exportPadding = 10,
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viewBackgroundColor,
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scale = 1,
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}: {
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exportBackground: boolean;
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exportPadding?: number;
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scale?: number;
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viewBackgroundColor: string;
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},
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createCanvas: (width: number, height: number) => any = function(
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width,
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height,
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) {
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const tempCanvas = document.createElement("canvas");
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tempCanvas.width = width * scale;
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tempCanvas.height = height * scale;
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return tempCanvas;
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},
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) {
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// calculate smallest area to fit the contents in
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let subCanvasX1 = Infinity;
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let subCanvasX2 = -Infinity;
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let subCanvasY1 = Infinity;
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let subCanvasY2 = -Infinity;
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elements.forEach(element => {
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const [x1, y1, x2, y2] = getElementAbsoluteCoords(element);
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subCanvasX1 = Math.min(subCanvasX1, x1);
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subCanvasY1 = Math.min(subCanvasY1, y1);
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subCanvasX2 = Math.max(subCanvasX2, x2);
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subCanvasY2 = Math.max(subCanvasY2, y2);
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});
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const width = distance(subCanvasX1, subCanvasX2) + exportPadding * 2;
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const height = distance(subCanvasY1, subCanvasY2) + exportPadding * 2;
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const tempCanvas: any = createCanvas(width, height);
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tempCanvas.getContext("2d")?.scale(scale, scale);
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renderScene(
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elements,
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rough.canvas(tempCanvas),
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tempCanvas,
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{
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viewBackgroundColor: exportBackground ? viewBackgroundColor : null,
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scrollX: 0,
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scrollY: 0,
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},
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{
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offsetX: -subCanvasX1 + exportPadding,
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offsetY: -subCanvasY1 + exportPadding,
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renderScrollbars: false,
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renderSelection: false,
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},
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);
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return tempCanvas;
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}
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