GwyGLView

GwyGLView — OpenGL 3D data display

Functions

Types and Values

struct GwyGLView
struct GwyGLViewClass

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GtkWidget
            ╰── GwyGLView

Implemented Interfaces

GwyGLView implements AtkImplementorIface and GtkBuildable.

Includes

#include <libgwydgets/gwydgets.h>

Description

GwyGLView displays a data field as a threedimensional heightfield using OpenGL. You can create a new OpenGL view for a data container with gwy_gl_view_new(). By default, it inherits properties like palette from data view settings, but supports separate settings -- see gwy_gl_view_set_gradient_key() et al.

GwyGLView allows the user to interactively rotate, scale, z-scale the data or move lights, depending on its movement state. There are no controls provided for mode change, you have to provide some yourself and set the movement mode with gwy_gl_view_set_movement_type().

You have initialize GtkGLExt with gtk_gl_init_check() and then Gwyddion's OpenGL with gwy_widgets_gl_init() before you can use GwyGLView. These functions may not always succeed, see their description for more. If OpenGL initialization fails (possibly because its support was not compiled in) GwyGLView cannot be even instantiated.

Functions

gwy_gl_view_new()

GtkWidget *
gwy_gl_view_new (GwyContainer *data);

Creates a new threedimensional OpenGL display of data .

The widget is initialized from container data .

Parameters

data

A GwyContainer containing the data to display.

 

Returns

The new OpenGL 3D widget as a GtkWidget.


gwy_gl_view_get_setup_prefix()

const gchar *
gwy_gl_view_get_setup_prefix (GwyGLView *glview);

Gets prefix identifying OpenGL view setup in the container.

Parameters

glview

An OpenGL data view widget.

 

Returns

The setup key prefix.


gwy_gl_view_set_setup_prefix()

void
gwy_gl_view_set_setup_prefix (GwyGLView *glview,
                              const gchar *key);

Sets the prefix of OpenGL view parameters in the container.

Parameters

glview

An OpenGL data view widget.

 

key

Container string prefix for keys identifying the view setup parameters. The GwyGLSetup is stored at key "/setup" under this prefix. Label objects are also stored under this prefix.

 

gwy_gl_view_get_data_key()

const gchar *
gwy_gl_view_get_data_key (GwyGLView *glview);

Gets the container key identifying the data field to visualize in an OpenGL view.

Parameters

glview

An OpenGL data view widget.

 

Returns

The string key, or NULL if it isn't set.


gwy_gl_view_set_data_key()

void
gwy_gl_view_set_data_key (GwyGLView *glview,
                          const gchar *key);

Sets the container key identifying the data field to visualize in an OpenGL view.

Parameters

glview

An OpenGL data view widget.

 

key

Container string key identifying the data field to visualize.

 

gwy_gl_view_set_ovlay()

void
gwy_gl_view_set_ovlay (GwyGLView *glview,
                       GwyPixmapLayer **ovlays,
                       guint novlays);

Sets overlays for an OpenGL view.

Parameters

glview

An OpenGL data view widget.

 

ovlays

List of novlays pixmap layers usable as overlays.

 

novlays

Number of items in ovlays .

 

gwy_gl_view_get_gradient_key()

const gchar *
gwy_gl_view_get_gradient_key (GwyGLView *glview);

Gets the container key identifying the colour gradient used to visualize data in an OpenGL view.

Parameters

glview

An OpenGL data view widget.

 

Returns

The string key, or NULL if it isn't set.


gwy_gl_view_set_gradient_key()

void
gwy_gl_view_set_gradient_key (GwyGLView *glview,
                              const gchar *key);

Sets the container key identifying the color gradient to use to visualize data in an OpenGL view.

Parameters

glview

An OpenGL data view widget.

 

key

Container string key identifying the color gradient to use for gradient visualization mode.

 

gwy_gl_view_get_material_key()

const gchar *
gwy_gl_view_get_material_key (GwyGLView *glview);

Gets the key identifying the GL material used to visualize data in a 3D view.

Parameters

glview

An OpenGL data view widget.

 

Returns

The string key, or NULL if it isn't set.


gwy_gl_view_set_material_key()

void
gwy_gl_view_set_material_key (GwyGLView *glview,
                              const gchar *key);

Sets the container key of the GL material used to visualize data in an OpenGL view.

Parameters

glview

An OpenGL data view widget.

 

key

Container string key identifying the color material to use for material visualization mode.

 

gwy_gl_view_get_reduced_size()

guint
gwy_gl_view_get_reduced_size (GwyGLView *glview);

Returns the reduced data size of an OpenGL view.

See gwy_gl_view_set_reduced_size() for details.

Parameters

glview

An OpenGL data view widget.

 

Returns

The reduced data size.

Note since 2.44 the reduced size has no influence because the OpenGL view does not downsample anything.


gwy_gl_view_set_reduced_size()

void
gwy_gl_view_set_reduced_size (GwyGLView *glview,
                              guint reduced_size);

Sets the reduced data size of an OpenGL view.

Data larger than reduced size may be shown downsampled during transforms and other changes to speed up the rendering. Final, full-size rendering is then performed after a timeout.

In case of the original data are not square, the reduced_size is the greater size of the downsampled data, the other dimension is proportional to the original size.

Changes in reduced size do not cause immediate redraw when an operation is pending and the view is shown in reduced size. It only affects future downsampling.

Note since 2.44 the reduced size has no influence because the OpenGL view does not downsample anything.

Parameters

glview

An OpenGL data view widget.

 

reduced_size

New reduced data size.

 

gwy_gl_view_get_movement_type()

GwyGLMovement
gwy_gl_view_get_movement_type (GwyGLView *glview);

Returns a movement type describing actual type of response on the mouse motion event.

Parameters

glview

An OpenGL data view widget.

 

Returns

Actual type of response on the mouse motion event


gwy_gl_view_set_movement_type()

void
gwy_gl_view_set_movement_type (GwyGLView *glview,
                               GwyGLMovement movement);

Sets the type of widget response on the mouse motion event.

Parameters

glview

An OpenGL data view widget.

 

movement

A new type of response on the mouse motion event.

 

gwy_gl_view_get_pixbuf()

GdkPixbuf *
gwy_gl_view_get_pixbuf (GwyGLView *glview);

Copies the contents of the OpenGL view framebuffer to a GdkPixbuf.

The size of the pixbuf is indentical to the size of the widget.

Parameters

glview

An OpenGL data view widget.

 

Returns

A newly allocated GdkPixbuf a copy of the framebuffer.


gwy_gl_view_get_pixbuf_with_alpha()

GdkPixbuf *
gwy_gl_view_get_pixbuf_with_alpha (GwyGLView *glview);

Creates a GdkPixbuf from the contents of the OpenGL view framebuffer, with transparent background.

The size of the pixbuf is indentical to the size of the widget.

The rendered surface is cut perfectly. However, if the scene contains also antialiased labels, these are cut in a way which currently only works with a white background.

Parameters

glview

An OpenGL data view widget.

 

Returns

A newly allocated GdkPixbuf a copy of the framebuffer.


gwy_gl_view_get_label()

GwyGLLabel *
gwy_gl_view_get_label (GwyGLView *glview,
                       GwyGLViewLabel label);

Gets requested 3D label object of an OpenGL view.

This is a convenience method that can be used instead of fetching the label object from the data container.

Parameters

glview

An OpenGL data view widget.

 

label

Label type to obtain.

 

Returns

The 3D label object representing label in glview .


gwy_gl_view_get_setup()

GwyGLSetup *
gwy_gl_view_get_setup (GwyGLView *glview);

Gets the 3D setup object of an OpenGL view.

This is a convenience method that can be used instead of fetching the setup object from the data container.

Parameters

glview

An OpenGL data view widget.

 

Returns

The corresponding 3D setup.


gwy_gl_view_get_data()

GwyContainer *
gwy_gl_view_get_data (GwyGLView *glview);

Returns the data container this OpenGL view displays.

Parameters

glview

An OpenGL data view widget.

 

Returns

The container as a GwyContainer.


gwy_gl_view_get_scale_range()

void
gwy_gl_view_get_scale_range (GwyGLView *glview,
                             gdouble *min_scale,
                             gdouble *max_scale);

Obtains the minimum and maximum zoom of a 3D data view

Parameters

glview

An OpenGL data view widget.

 

min_scale

Location to put minimum scale, or NULL.

 

max_scale

Location to put maximum scale, or NULL.

 

gwy_gl_view_set_scale_range()

void
gwy_gl_view_set_scale_range (GwyGLView *glview,
                             gdouble min_scale,
                             gdouble max_scale);

Sets the minimum and maximum zoom of a 3D data view.

Recommended zoom values are 0.5 - 5.0.

Parameters

glview

An OpenGL data view widget.

 

min_scale

Minimum zoom of the 3D data view, pass 0.0 to keep the current value.

 

max_scale

Maximum zoom of the 3D data view, pass 0.0 to keep the current value.

 

gwy_gl_view_class_disable_axis_drawing()

void
gwy_gl_view_class_disable_axis_drawing
                               (gboolean disable);

Globally disables drawing of OpenGL view axes.

If axis drawing is disabled, axes are never drawn. If it is not disabled, their rendering depends on the OpenGL view setup.

This function is a hack and exists to work around various GL implementations that crash on pixmap drawing operations.

Parameters

disable

TRUE to disable OpenGL view axes globally, FALSE to enable them.

 

gwy_gl_view_get_mask_key()

const gchar *
gwy_gl_view_get_mask_key (GwyGLView *glview);

Gets the container key identifying the mask field for visualisation in an OpenGL view.

Parameters

glview

An OpenGL data view widget.

 

Returns

The string key, or NULL if it isn't set.


gwy_gl_view_set_mask_key()

void
gwy_gl_view_set_mask_key (GwyGLView *glview,
                          const gchar *key);

Sets the container key identifying the mask field for visualisation in an OpenGL view.

Parameters

glview

An OpenGL data view widget.

 

key

Container string key identifying the mask field for visualisation

 

Types and Values

struct GwyGLView

struct GwyGLView;

struct GwyGLViewClass

struct GwyGLViewClass {
    GtkWidgetClass parent_class;

    void (*reserved1)(void);
    void (*reserved2)(void);
    void (*reserved3)(void);
    void (*reserved4)(void);
    void (*reserved5)(void);
    void (*reserved6)(void);
};

See Also

GwyGLWindow -- window combining OpenGL view with controls, GwyGLMaterial -- OpenGL materials, GwyGLLabel -- Labels on OpenGL view, GwyGLSetup -- 3D scene setup