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  • Marks on axes
  • Types of charts
  • Restoring the default values
  • Managing the zoom
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Stored procedures
Defines the zoom of a chart.
Note: This function is similar to <Chart>.Origin.. However, the <Chart>.Zoom FUNCTION function allows the user to return to the initial zoom of the graph using one of the following methods:
    Example
    GRF_MonGraphe.Zoom(5, 12, grXCoordinate)
    GRF_MonGraphe.Dessine()
    Syntax
    <Chart control>.Zoom(<Minimum mark> [, <Maximum mark> [, <Axis>]])
    <Chart control>: Control name
    Name of the Chart control to use (in the window editor).
    <Minimum mark>: Real
    Start mark on the specified axis. This parameter can also correspond to a duration, a date, a time or a date-time.
    <Maximum mark>: Optional real
    End mark on the specified axis.
    If this parameter is not specified, <Maximum mark> corresponds to the maximum value of chart data. This parameter can also correspond to a duration, a date, a time or a date-time.
    <Axis>: Optional Integer constant
    Axis for which the marks must be modified:
    grSecondaryYCoordinateSecondary Y-axis (vertical axis).
    grXCoordinate
    (default value)
    X-axis (horizontal axis).
    grYCoordinateY-axis (vertical axis).
    Remarks

    Marks on axes

    • X-axis (horizontal axis): the parameters <Graduation minimale> and <Graduation maximale> correspond to the minimum and maximum index of data in the series displayed.
    • Y-axis (vertical axis): the parameters <Graduation minimale> and <Graduation maximale> correspond to the minimum and maximum value of the data.
    • Limits: 100 graduations above and 100 graduations below the x-axis.
    • To modify the frequency of marks on the horizontal or vertical axis of a chart, use <Chart>.Interval.
    • The data defined by <Chart>.Zoom will be taken into account during the next call to <Chart>.Draw.

    Types of charts

    The marks on axes have no effect on the Pie charts.

    Restoring the default values

    To restore the chart display before the zoom, the minimum and maximum values of axes must be used. These values can be known via the following properties:
    XAxisMaxThe XAxisMax property gets the maximum value of the X-axis in a Chart control. This property can be used in the "Zoom" event of a Chart control to identify the section displayed.
    XAxisMinThe XAxisMin property gets the minimum value of the X-axis in a Chart control. This property can be used in the "Zoom" event of a Chart control to identify the section displayed.
    YAxisMaxThe YAxisMax property gets the maximum value of the Y-axis in a Chart control. This property can be used in the "Zoom" event of a Chart control to identify the section displayed.
    YAxisMinThe YAxisMin property gets the minimum value of the Y-axis in a Chart control.
    ZAxisMaxThe ZAxisMax property gets the maximum value of the Z-axis in a Chart control (Surface chart).
    ZAxisMinThe ZAxisMin property gets the minimum value of the Z-axis in a Chart control (Surface chart).
    For example:
    // Code permettant de zoomer
    GRF_MonGraphe.Zoom(5, 12, grXCoordinate)
    GRF_MonGraphe.Dessine()
    // Code permettant de dé-zoomer
    GRF_MonGraphe.Zoom(GRF_MonGraphe.AxeXMin, GRF_MonGraphe.AxeXMax, grXCoordinate)
    GRF_MonGraphe.Dessine()

    Managing the zoom

    <Chart>.Parameter is used to configure several options for zoom management in the Chart controls:
    • Managing scrollbars.
    • Managing the zoom out.
    Component: wd300grf.dll
    Minimum version required
    • Version 24
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    Last update: 09/26/2024

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