## class Fl_Chart

### Class Hierarchy

    Fl_Widget
       |
       +----Fl_Chart

### Include Files

    #include <FL/Fl_Chart.H>

### Description

This widget displays simple charts and is provided for Forms compatibility.

### Methods

Fl_Chart ~Fl_Chart add | autosize bounds | clear insert | maxsize replace | size type

#### Fl_Chart::Fl_Chart(int x, int y, int w, int h, const char *label = 0)

Creates a new `Fl_Chart` widget using the given position, size, and label string. The default boxtype is `FL_NO_BOX`.

#### virtual Fl_Chart::~Fl_Chart()

Destroys the `Fl_Chart` widget and all of its data.

#### void add(double value, const char *label = NULL, uchar color = 0)

The `add` method adds the `value` and optionally `label` and `color` to the chart.

#### uchar autosize(void) const
void autosize(uchar onoff)

The `autosize` method controls whether or not the chart will automatically adjust the bounds of the chart. The first form returns a boolean value that is non-zero if auto-sizing is enabled and zero is auto-sizing is disabled.

The second form of `autosize` sets the auto-sizing property to `onoff`.

#### void bounds(double *a, double *b)
void bounds(double a, double b)

The `bounds` method gets or sets the lower and upper bounds of the chart values to `a` and `b` respectively.

#### void clear(void)

The `clear` method removes all values from the chart.

#### void insert(int pos, double value, const char *label = NULL, uchar color = 0)

The `insert` method inserts a data value at the given position `pos`. Position 0 is the first data value.

#### int maxsize(void) const
void maxsize(int n)

The `maxsize` method gets or sets the maximum number of data values for a chart. If you do not call this method then the chart will be allowed to grow to any size depending on available memory.

#### void replace(int pos, double value, const char *label = NULL, uchar color = 0)

The `replace` method replaces data value `pos` with `value`, `label`, and `color`. Position 0 is the first data value.

#### int size(void) const

The `size` method returns the number of data values in the chart.

#### uchar type() const
void type(uchar t)

The first form of `type()` returns the current chart type. The chart type can be one of the following:

FL_BAR_CHART
  Each sample value is drawn as a vertical bar.
FL_FILLED_CHART
  The chart is filled from the bottom of the graph to the sample values.
FL_HORBAR_CHART
  Each sample value is drawn as a horizontal bar.
FL_LINE_CHART
  The chart is drawn as a polyline with vertices at each sample value.
FL_PIE_CHART
  A pie chart is drawn with each sample value being drawn as a proportionate slice in the circle.
FL_SPECIALPIE_CHART
  Like FL_PIE_CHART, but the first slice is separated from the pie.
FL_SPIKE_CHART
  Each sample value is drawn as a vertical line.

The second form of `type()` sets the chart type to `t`.