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FAQ (Common Issues and the Fastest Troubleshooting Path)

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FAQ (Common Issues and the Fastest Troubleshooting Path)

This chapter helps you locate the cause with the shortest path when you encounter “nothing shows”, “wrong rendering”, or “weird interactions”.

0. Fast troubleshooting path (30-second version)

Check in order. This usually solves 80% of issues:

  1. Does coordinate system match SeriesType

    • Cartesian2D: Line/Bar/Scatter/Heatmap
    • Polar2D: Radar

  2. Do you actually have data

    • series.Count > 0
    • the serie has seriesData.Count > 0

  3. Do axis types match what your data means

    • Category axis: labels is not empty; data x/y are indices (0/1/2…)
    • Value axis: x/y are continuous numeric values

  4. Any NaN / Infinity

  5. Is data excluded by Value axis range

    • Check if min/max are fixed
    • Check if autoRangeMin/autoRangeMax are disabled

1. I clicked Preview but nothing shows

Possible causes

  • seriesData is empty
  • Serie.visible = false
  • coordinate system does not match SerieType (e.g. Radar in Cartesian2D)
  • axis range does not include your data (common when Value axis range is locked manually)

What to do

  1. In the Inspector, find series and expand a Serie
  2. Check:
    • whether visible is true
    • whether seriesData has any elements
  3. Check the coordinate system:
    • Radar -> coordinateSystem = Polar2D
    • Line/Bar/Scatter/Heatmap -> coordinateSystem = Cartesian2D
  4. If you are using Value axes:
    • first disable any “fixed min/max” range settings
    • enable both autoRangeMin/autoRangeMax, confirm it renders, then lock step-by-step

2. Category axis has labels, but points/bars are not on labels

Typical symptoms

  • bars appear between two labels
  • line points do not align to A/B/C

Quick conclusion

  • With a Category axis, x (or y) should usually be the category index (0/1/2/…), not an arbitrary value.

What to do

  • Check your data points:
    • labels[0] corresponds to x=0
    • labels[1] corresponds to x=1
  • If you are making a bar chart:
    • set LabelPlacement to CellCenter

3. Value axis range is weird (too large/too small)

Possible causes

  • Value axis range is locked (min/max)
  • only one side is locked but the other side has extreme values
  • rounding/unit snapped the range to an unsuitable unit

What to do

  1. First, revert to full auto range and confirm it renders
  2. Then gradually add your constraints:
    • common for bar charts: minValue=0 + autoRangeMax=true
  3. If you see lots of weird decimal ticks:
    • set labelFormat first

4. Line is broken / nothing renders

Most common cause

  • NaN / Infinity exists in your data

What to do

  • Filter at the data source:
    • float.IsNaN(x/y/z)
    • float.IsInfinity(x/y/z)

5. Bar chart and labels do not align

Quick conclusion

  • 99% of the time, LabelPlacement is not the right one

What to do

  • Bar: prefer LabelPlacement = CellCenter
  • Line/Scatter: prefer LabelPlacement = Tick

6. Heatmap is all one color / looks flat

Possible causes

  • autoRange=false but minValue/maxValue are unreasonable
  • clamp=false and extreme values stretch the color range
  • all data points have the same value (or all are 0)

What to do

  1. Enable autoRange
  2. Check whether data point value varies
  3. If you need a fixed range:
    • set minValue/maxValue reasonably

7. Radar labels are missing/messy

Common cause

  • dimension label sources are inconsistent
  • For each Radar point:
    • x = dimension index
    • value = numeric value
    • name = dimension name

Also ensure Radar does not rely on Cartesian axis configuration to obtain labels.

8. tooltip/hover/selection points to the wrong item or state is unstable

Common cause

  • new point identifiers are generated on every refresh

What to do

  • keep each point SeriesData.id stable
  • avoid clearing and generating a completely new set of points with Guid.NewGuid() on every refresh

9. I don’t know which chapter to read

  • If you are in the workflow stage (create/clone/preview/export): see 01_01-EditorWorkflow.md
  • If you are dealing with axes/range/alignment/unit/format: see section 7 of 00_02-WorkflowAndLibrary.md
  • If you need the data conventions for a specific chart (SeriesData.x/y/z): see section 8 of 00_02-WorkflowAndLibrary.md
  • If you just want copy-ready templates: see 04_08-CommonRecipes.md