+++ /dev/null
-<!-- ##### SECTION Title ##### -->
-Pango Interaction
-
-<!-- ##### SECTION Short_Description ##### -->
-Using Pango in GDK
-
-<!-- ##### SECTION Long_Description ##### -->
-<para>
-Pango is the text layout system used by GDK and GTK+. The functions
-and types in this section are used to obtain clip regions for
-#PangoLayouts, and to get #PangoContexts that can be used with
-GDK.
-</para>
-<para>
-Creating a #PangoLayout object is the first step in rendering text,
-and requires getting a handle to a #PangoContext. For GTK+ programs,
-you'll usually want to use gtk_widget_get_pango_context(), or
-gtk_widget_create_pango_layout(), rather than using the lowlevel
-gdk_pango_context_get_for_screen(). Once you have a #PangoLayout, you
-can set the text and attributes of it with Pango functions like
-pango_layout_set_text() and get its size with pango_layout_get_size().
-(Note that Pango uses a fixed point system internally, so converting
-between Pango units and pixels using <link
-linkend="PANGO-SCALE-CAPS">PANGO_SCALE</link> or the PANGO_PIXELS() macro.)
-</para>
-<para>
-Rendering a Pango layout is done most simply with pango_cairo_show_layout();
-you can also draw pieces of the layout with pango_cairo_show_layout_line().
-</para>
-<example id="rotated-example">
-<title>Draw transformed text with Pango and cairo</title>
-<!-- Note that this example is basically the same as
- demos/gtk-demo/rotated_text.c -->
-<programlisting>
-#define RADIUS 100
-#define N_WORDS 10
-#define FONT "Sans Bold 18"
-
-PangoContext *context;
-PangoLayout *layout;
-PangoFontDescription *desc;
-
-double radius;
-int width, height;
-int i;
-
-/* Set up a transformation matrix so that the user space coordinates for
- * where we are drawing are [-RADIUS, RADIUS], [-RADIUS, RADIUS]
- * We first center, then change the scale */
-
-width = gdk_window_get_width (window);
-height = gdk_window_get_height (window);
-radius = MIN (width, height) / 2.;
-
-cairo_translate (cr,
- radius + (width - 2 * radius) / 2,
- radius + (height - 2 * radius) / 2);
- cairo_scale (cr, radius / RADIUS, radius / RADIUS);
-
-/* Create a PangoLayout, set the font and text */
-context = gdk_pango_context_get_for_screen (screen);
-layout = pango_layout_new (context);
-pango_layout_set_text (layout, "Text", -1);
-desc = pango_font_description_from_string (FONT);
-pango_layout_set_font_description (layout, desc);
-pango_font_description_free (desc);
-
-/* Draw the layout N_WORDS times in a circle */
-for (i = 0; i < N_WORDS; i++)
- {
- double red, green, blue;
- double angle = 2 * G_PI * i / n_words;
-
- cairo_save (cr);
-
- /* Gradient from red at angle == 60 to blue at angle == 300 */
- red = (1 + cos (angle - 60)) / 2;
- green = 0;
- blue = 1 - red;
-
- cairo_set_source_rgb (cr, red, green, blue);
- cairo_rotate (cr, angle);
-
- /* Inform Pango to re-layout the text with the new transformation matrix */
- pango_cairo_update_layout (cr, layout);
-
- pango_layout_get_size (layout, &width, &height);
-
- cairo_move_to (cr, - width / 2 / PANGO_SCALE, - DEFAULT_TEXT_RADIUS);
- pango_cairo_show_layout (cr, layout);
-
- cairo_restore (cr);
- }
-
-g_object_unref (layout);
-g_object_unref (context);
-</programlisting>
-</example>
-<figure>
- <title>Output of <xref linkend="rotated-example"/></title>
- <graphic fileref="rotated-text.png" format="PNG"/>
-</figure>
-
-<!-- ##### SECTION See_Also ##### -->
-<para>
-
-</para>
-
-<!-- ##### SECTION Stability_Level ##### -->
-
-
-<!-- ##### SECTION Image ##### -->
-
-
-<!-- ##### FUNCTION gdk_pango_layout_get_clip_region ##### -->
-<para>
-
-</para>
-
-@layout:
-@x_origin:
-@y_origin:
-@index_ranges:
-@n_ranges:
-@Returns:
-
-
-<!-- ##### FUNCTION gdk_pango_layout_line_get_clip_region ##### -->
-<para>
-
-</para>
-
-@line:
-@x_origin:
-@y_origin:
-@index_ranges:
-@n_ranges:
-@Returns:
-
-
-<!-- ##### FUNCTION gdk_pango_context_get ##### -->
-<para>
-
-</para>
-
-@void:
-@Returns:
-
-
-<!-- ##### FUNCTION gdk_pango_context_get_for_screen ##### -->
-<para>
-
-</para>
-
-@screen:
-@Returns:
-
-
#include <math.h>
#include <pango/pangocairo.h>
+
+/**
+ * SECTION:pango_interaction
+ * @Short_description: Using Pango in GDK
+ * @Title: Pango Interaction
+ *
+ * Pango is the text layout system used by GDK and GTK+. The functions
+ * and types in this section are used to obtain clip regions for
+ * #PangoLayouts, and to get #PangoContexts that can be used with
+ * GDK.
+ *
+ * Creating a #PangoLayout object is the first step in rendering text,
+ * and requires getting a handle to a #PangoContext. For GTK+ programs,
+ * you'll usually want to use gtk_widget_get_pango_context(), or
+ * gtk_widget_create_pango_layout(), rather than using the lowlevel
+ * gdk_pango_context_get_for_screen(). Once you have a #PangoLayout, you
+ * can set the text and attributes of it with Pango functions like
+ * pango_layout_set_text() and get its size with pango_layout_get_size().
+ * (Note that Pango uses a fixed point system internally, so converting
+ * between Pango units and pixels using <link
+ * linkend="PANGO-SCALE-CAPS">PANGO_SCALE</link> or the PANGO_PIXELS() macro.)
+ *
+ * Rendering a Pango layout is done most simply with pango_cairo_show_layout();
+ * you can also draw pieces of the layout with pango_cairo_show_layout_line().
+ * <example id="rotated-example">
+ * <title>Draw transformed text with Pango and cairo</title>
+ * <!-- Note that this example is basically the same as
+ * demos/gtk-demo/rotated_text.c -->
+ * <programlisting>
+ * #define RADIUS 100
+ * #define N_WORDS 10
+ * #define FONT "Sans Bold 18"
+ *
+ * PangoContext *context;
+ * PangoLayout *layout;
+ * PangoFontDescription *desc;
+ *
+ * double radius;
+ * int width, height;
+ * int i;
+ *
+ * /<!---->* Set up a transformation matrix so that the user space coordinates for
+ * * where we are drawing are [-RADIUS, RADIUS], [-RADIUS, RADIUS]
+ * * We first center, then change the scale *<!---->/
+ *
+ * width = gdk_window_get_width (window);
+ * height = gdk_window_get_height (window);
+ * radius = MIN (width, height) / 2.;
+ *
+ * cairo_translate (cr,
+ * radius + (width - 2 * radius) / 2,
+ * radius + (height - 2 * radius) / 2);
+ * cairo_scale (cr, radius / RADIUS, radius / RADIUS);
+ *
+ * /<!---->* Create a PangoLayout, set the font and text *<!---->/
+ * context = gdk_pango_context_get_for_screen (screen);
+ * layout = pango_layout_new (context);
+ * pango_layout_set_text (layout, "Text", -1);
+ * desc = pango_font_description_from_string (FONT);
+ * pango_layout_set_font_description (layout, desc);
+ * pango_font_description_free (desc);
+ *
+ * /<!---->* Draw the layout N_WORDS times in a circle *<!---->/
+ * for (i = 0; i < N_WORDS; i++)
+ * {
+ * double red, green, blue;
+ * double angle = 2 * G_PI * i / n_words;
+ *
+ * cairo_save (cr);
+ *
+ * /<!---->* Gradient from red at angle == 60 to blue at angle == 300 *<!---->/
+ * red = (1 + cos (angle - 60)) / 2;
+ * green = 0;
+ * blue = 1 - red;
+ *
+ * cairo_set_source_rgb (cr, red, green, blue);
+ * cairo_rotate (cr, angle);
+ *
+ * /<!---->* Inform Pango to re-layout the text with the new transformation matrix *<!---->/
+ * pango_cairo_update_layout (cr, layout);
+ *
+ * pango_layout_get_size (layout, &width, &height);
+ *
+ * cairo_move_to (cr, - width / 2 / PANGO_SCALE, - DEFAULT_TEXT_RADIUS);
+ * pango_cairo_show_layout (cr, layout);
+ *
+ * cairo_restore (cr);
+ * }
+ *
+ * g_object_unref (layout);
+ * g_object_unref (context);
+ * </programlisting>
+ * </example>
+ * <figure>
+ * <title>Output of <xref linkend="rotated-example"/></title>
+ * <graphic fileref="rotated-text.png" format="PNG"/>
+ * </figure>
+ */
+
/* Get a clip region to draw only part of a layout. index_ranges
* contains alternating range starts/stops. The region is the
* region which contains the given ranges, i.e. if you draw with the
projects / ~andy / gtk / commitdiff