Axis Labels for SVG Charts
Axis labels are text elements positioned at scaled tick values, with alignment attributes controlling how they sit against the axis.
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Positioning Ticks and Labels from the Scale
Tick positions come from passing chosen tick values back through the same scale function used to position the data, ensuring labels align exactly with the gridlines and data points they describe rather than being placed at arbitrary even pixel intervals.
- Pass chosen tick values through the same scale used for the data
- This guarantees labels align exactly with the data they describe
- Avoids the misalignment of placing ticks at even pixel intervals
Using text-anchor and dominant-baseline for Alignment
SVG text positioning is controlled by text-anchor for horizontal alignment and dominant-baseline for vertical, so y-axis labels typically use text-anchor end to sit right-aligned against the axis while x-axis labels use middle to center beneath their tick.
- text-anchor controls horizontal alignment relative to the x coordinate
- dominant-baseline controls vertical alignment relative to the y coordinate
- Y labels typically use end alignment while x labels use middle
Frequently Asked Questions
How do I make axis labels line up exactly with the data?
Pass the tick values through the same scale function used to position the data points, so both use identical mapping from data space to pixels.
What's the difference between text-anchor and dominant-baseline?
text-anchor controls horizontal alignment around the x coordinate, while dominant-baseline controls vertical alignment around the y coordinate.
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