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  • Overview
  • Implementation
  • Crosshair in a Chart control
  • Crosshair in the AAFs (Automatic Application Features)
  • Modifying the multiple crosshair by programming
  • Configuring the crosshair options by programming
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Overview
In a Line chart, it may be difficult to read the value of axes for a point that is far from these axes.
Via the new crosshair included in all charts, the end user precisely knows the pointed value.
All charts with axes automatically benefit from the crosshair.
The user hovers a point in the chart and the crosshair is displayed!
Crosshair on a line
If the vertical crosshair crosses several lines, the value is displayed for each intersection: it is the multiple crosshair.
Multiple crosshairs
For a multiple crosshair, the tooltip header can be customized.
Implementation

Crosshair in a Chart control

The crosshair is available by default for all Chart controls created from version 20.
To display a crosshair in a Chart control:
  1. Open the Chart control description window.
  2. In the "Details" tab:
    • WINDEV in the "Zoom and crosshair" area, check "Enable chart crosshair".
      The "Multiple crosshair (stacked lines and columns)" option allows using multiple crosshairs in Line or Column charts.
  3. Validate the control description window.
Remarks:
  • The crosshair is available for the following types of charts: Area, Bubble, Line, Column, MinMax, Radar and Waterfall.
WINDEV

Crosshair in the AAFs (Automatic Application Features)

If the crosshair is not enabled in a chart, it can be enabled by the user via the popup menu of chart ("Enable the crosshair").

Modifying the multiple crosshair by programming

By default, the multiple crosshair displays:
  • in header, the category name.
  • the content of different tooltips for the points corresponding to the crosshair.
It is possible to modify the head of the bubble in the test pattern thanks to the grTooltip function used with the constant grTooltipFormatCrosshairHeader.
For example:
grTooltip(CHART_Chart1, grTooltipFormatCrosshairHeader, "Category: [%CATEGORY%]")

Configuring the crosshair options by programming

The crosshair has the following characteristics by default:
  • color based on the color of gridlines in the Chart control.
  • thickness: 1 pixel.
  • opacity: entirely opaque crosshair.
These characteristics can be modified by the following properties:
Versions 20 and later
CrosshairColor
New in version 20
CrosshairColor
CrosshairColor
The Property Color Mire allows to know and modify the Color of an Chart control test pattern .
Versions 20 and later
CrosshairOpacity
New in version 20
CrosshairOpacity
CrosshairOpacity
The Property OpacityMire allows to know and modify the opacity of the Chart control test pattern.
Versions 20 and later
CrosshairThickness
New in version 20
CrosshairThickness
CrosshairThickness
The CrosshairThickness property is used to determine and change the thickness of the crosshair in a Chart control.

Related Examples:
WD Chart Training (WINDEV): WD Chart
[ + ] This example presents the different uses of the Chart control.
Different types of charts are presented:
- Pie
- Sunburst
- Line
- Scatter
- Column
- Area
- etc.

The main features presented here are the possibility to customize of charts from the code, as well as to fill the chart from an HFSQL data file, or in the editor.
Minimum version required
  • Version 20
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