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adjust font baseline on resize (#1820)

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* adjust font baseline on resize

* simplify font scaling on resize

* fix: resizing text to avoid glitchy behavior

* make text resizing deterministic

* no TEXT_WIDTH_PADDING hack

Co-authored-by: dwelle <luzar.david@gmail.com>
This commit is contained in:
Daishi Kato 2020-07-09 22:22:10 +09:00 committed by GitHub
parent 5d7020cce6
commit 6cc6e13892
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1 changed files with 12 additions and 31 deletions
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43
src/element/resizeElements.ts
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@ -207,45 +207,26 @@ const rescalePointsInElement = (
}
: {};
// This is not computationally ideal, but can't be helped.
const MIN_FONT_SIZE = 1;
const measureFontSizeFromWH = (
element: NonDeleted<ExcalidrawTextElement>,
nextWidth: number,
nextHeight: number,
): { size: number; baseline: number } | null => {
let scale = Math.min(nextWidth / element.width, nextHeight / element.height);
let nextFontSize = element.fontSize * scale;
let metrics = measureText(
// We only use width to scale font on resize
const nextFontSize = element.fontSize * (nextWidth / element.width);
if (nextFontSize < MIN_FONT_SIZE) {
return null;
}
const metrics = measureText(
element.text,
getFontString({ fontSize: nextFontSize, fontFamily: element.fontFamily }),
);
if (metrics.width - nextWidth < 1 && metrics.height - nextHeight < 1) {
return { size: nextFontSize, baseline: metrics.baseline };
}
// second measurement
scale = Math.min(
Math.min(nextWidth, metrics.width) / element.width,
Math.min(nextHeight, metrics.height) / element.height,
);
nextFontSize = element.fontSize * scale;
metrics = measureText(
element.text,
getFontString({ fontSize: nextFontSize, fontFamily: element.fontFamily }),
);
if (metrics.width - nextWidth < 1 && metrics.height - nextHeight < 1) {
return { size: nextFontSize, baseline: metrics.baseline };
}
// third measurement
scale *= 0.99; // just heuristics
nextFontSize = element.fontSize * scale;
metrics = measureText(
element.text,
getFontString({ fontSize: nextFontSize, fontFamily: element.fontFamily }),
);
if (metrics.width - nextWidth < 1 && metrics.height - nextHeight < 1) {
return { size: nextFontSize, baseline: metrics.baseline };
}
return null;
return {
size: nextFontSize,
baseline: metrics.baseline + (nextHeight - metrics.height),
};
};
const getSidesForResizeHandle = (