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fix: clip color name text to swatch boundaries #2

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Merged
mpge merged 1 commit into from
Apr 5, 2026
Merged

fix: clip color name text to swatch boundaries #2

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38 changes: 32 additions & 6 deletions src/render/svg.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,17 @@ function escapeXml(str: string): string {
}

/**
* Render a single swatch with color, name, and hex
* Estimate text width using average character width ratios.
* This is an approximation since SVG doesn't have built-in text measurement.
*/
function estimateTextWidth(text: string, fontSize: number): number {
// Average character width is roughly 0.6x the font size for sans-serif
return text.length * fontSize * 0.6;
}

/**
* Render a single swatch with color, name, and hex.
* Uses clipPath to prevent text from overflowing swatch boundaries.
*/
function renderSwatch(
color: PaletteColor,
Expand All @@ -23,12 +33,21 @@ function renderSwatch(
showName: boolean;
showHex: boolean;
font: string;
}
},
swatchIndex: number
): string {
const { x, y, width, height, radius, nameFontSize, hexFontSize } = swatch;
const { showName, showHex, font } = options;

const lines: string[] = [];
const clipId = `swatch-clip-${swatchIndex}`;

// Define a clipPath for this swatch so text never overflows
lines.push(
` <clipPath id="${clipId}">`,
` <rect x="${x}" y="${y}" width="${width}" height="${height}" rx="${radius}" />`,
` </clipPath>`
);

// Swatch background
lines.push(
Expand All @@ -38,20 +57,27 @@ function renderSwatch(
// Calculate text positions - bottom-left aligned with padding
const textPadding = Math.min(12, width * 0.08);
const textX = x + textPadding;
const availableTextWidth = width - textPadding * 2;
let textY = y + height - textPadding;

// Hex code (bottom line)
if (showHex) {
lines.push(
` <text x="${textX}" y="${textY}" font-family="${escapeXml(font)}" font-size="${hexFontSize}" fill="${color.textColor}" opacity="0.85">${color.hex}</text>`
` <text x="${textX}" y="${textY}" font-family="${escapeXml(font)}" font-size="${hexFontSize}" fill="${color.textColor}" opacity="0.85" clip-path="url(#${clipId})">${color.hex}</text>`
);
textY -= hexFontSize + 4;
}

// Color name (above hex)
// Color name (above hex) - scale down font if name is too wide
if (showName && color.name) {
let adjustedNameSize = nameFontSize;
const estimatedWidth = estimateTextWidth(color.name, adjustedNameSize);
if (estimatedWidth > availableTextWidth && availableTextWidth > 0) {
adjustedNameSize = Math.max(8, adjustedNameSize * (availableTextWidth / estimatedWidth));
}

lines.push(
` <text x="${textX}" y="${textY}" font-family="${escapeXml(font)}" font-size="${nameFontSize}" font-weight="600" fill="${color.textColor}">${escapeXml(color.name)}</text>`
` <text x="${textX}" y="${textY}" font-family="${escapeXml(font)}" font-size="${adjustedNameSize.toFixed(1)}" font-weight="600" fill="${color.textColor}" clip-path="url(#${clipId})">${escapeXml(color.name)}</text>`
);
}

Expand Down Expand Up @@ -152,7 +178,7 @@ export function renderSvg(
showName: opts.showName,
showHex: opts.showHex,
font,
})
}, i)
);
}
});
Expand Down
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