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Class Gtk::Curve

Allows direct editing of a curve.
Contained in: Gtk
Derived from: Gtk::DrawingArea
Derived by: none

#include <gtk--/curve.h>


public function member index:

Curve();
signal void curve_type_changed();
void get_vector(int num, gfloat* data);
GtkCurve* gtkobj();
const GtkCurve* gtkobj() const;
static bool isA(Object* object);
void reset();
void set_curve_type(GtkCurveType type);
void set_gamma(gfloat gamma);
void set_range(gfloat min_x, gfloat max_x, gfloat min_y, gfloat max_y);
void set_vector(const CurveArray& vect);
virtual ~Curve();
 

protected function member index:

virtual void curve_type_changed_impl();
 

Description:

The Gtk::Curve widget allows the user to edit a curve covering a range of values. It is typically used to fine-tune color balances in graphics applications like the Gimp.

The Gtk::Curve widget has 3 modes of operation - spline, linear and free. In spline mode the user places points on the curve which are automatically connected together into a smooth curve. In linear mode the user places points on the curve which are connected by straight lines. In free mode the user can draw the points of the curve freely, and they are not connected at all.


Function Member Descriptions:

Gtk::Curve::curve_type_changed - Emitted when the curve type has been changed.

signal void curve_type_changed();
virtual void curve_type_changed_impl();
The curve type can be changed explicitly with a call to set_curve_type. It is also changed as a side-effect of calling reset or set_gamma.


Gtk::Curve::get_vector - Returns a vector of points representing the curve.

void get_vector(int num, gfloat* data);

data: Returns the points.



Gtk::Curve::gtkobj - Returns the underlaying gtk+ object.

GtkCurve* gtkobj();

Gtk::Curve::isA - Returns true if object is this type.

static bool isA(Object* object);

Gtk::Curve::reset - Reset the curve.

void reset();
Resets the curve to a straight line from the minimum x & y values to the maximum x & y values (i.e. from the bottom-left to the top-right corners). The curve type is not changed.


Gtk::Curve::set_curve_type - Sets the type of the curve.

void set_curve_type(GtkCurveType type);
The curve will remain unchanged except when changing from a free curve to a linear or spline curve, in which case the curve will be changed as little as possible. type: The type of the curve. Possible values are: GTK_CURVE_TYPE_LINEAR, GTK_CURVE_TYPE_SPLINE, GTK_CURVE_TYPE_FREE.


Gtk::Curve::set_gamma - Recomputes the entire curve using the given gamma value.

void set_gamma(gfloat gamma);
A gamma value of 1 results in a straight line. Values greater than 1 result in a curve above the straight line. Values less than 1 result in a curve below the straight line. The curve type is changed to GTK_CURVE_TYPE_FREE.

gamma: The gamma value.



Gtk::Curve::set_range - Sets the minimum and maximum x & y values of the curve.

void set_range(gfloat min_x, gfloat max_x, gfloat min_y, gfloat max_y);
The curve is also reset with a call to .

min_x: The minimum x value.

max_x: The maximum x value.

min_y: The minimum y value.

max_y: The maximum y value.



Gtk::Curve::set_vector - Sets the vector of points on the curve.

void set_vector(const CurveArray& vect);
The curve type is set to GTK_CURVE_TYPE_FREE.

vect: The points on the curve.