272 lines
8.9 KiB
C
272 lines
8.9 KiB
C
/* Path/Curve Editor
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*
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* This demo shows an elaborate curve editor that you would expect to find
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* in a vector graphics editor. It is built on top of GTK's path APIs.
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*/
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#include <gtk/gtk.h>
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#include "curve-editor.h"
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static GskPath *
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make_circle_path (void)
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{
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float w = 310;
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float h = 310;
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float cx = w / 2;
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float cy = h / 2;
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float pad = 20;
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float r = (w - 2 * pad) / 2;
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float k = 0.55228;
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float kr = k * r;
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GskPathBuilder *builder;
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builder = gsk_path_builder_new ();
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gsk_path_builder_move_to (builder, cx, pad);
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gsk_path_builder_cubic_to (builder, cx + kr, pad,
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w - pad, cy - kr,
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w - pad, cy);
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gsk_path_builder_cubic_to (builder, w - pad, cy + kr,
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cx + kr, h - pad,
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cx, h - pad);
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gsk_path_builder_cubic_to (builder, cx - kr, h - pad,
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pad, cy + kr,
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pad, cy);
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#if 0
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gsk_path_builder_cubic_to (builder, pad, cy - kr,
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cx - kr, pad,
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cx, pad);
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gsk_path_builder_close (builder);
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#endif
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return gsk_path_builder_free_to_path (builder);
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}
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static void
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edit_changed (GtkToggleButton *button,
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GParamSpec *pspec,
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CurveEditor *editor)
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{
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curve_editor_set_edit (editor, gtk_toggle_button_get_active (button));
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}
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static void
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reset (GtkButton *button,
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CurveEditor *editor)
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{
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GskPath *path;
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path = make_circle_path ();
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curve_editor_set_path (editor, path);
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gsk_path_unref (path);
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}
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static void
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line_width_changed (GtkSpinButton *spin,
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CurveEditor *editor)
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{
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GskStroke *stroke;
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stroke = gsk_stroke_copy (curve_editor_get_stroke (editor));
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gsk_stroke_set_line_width (stroke, gtk_spin_button_get_value (spin));
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curve_editor_set_stroke (editor, stroke);
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gsk_stroke_free (stroke);
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}
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static void
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cap_changed (GtkDropDown *combo,
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GParamSpec *pspec,
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CurveEditor *editor)
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{
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GskStroke *stroke;
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stroke = gsk_stroke_copy (curve_editor_get_stroke (editor));
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gsk_stroke_set_line_cap (stroke, (GskLineCap)gtk_drop_down_get_selected (combo));
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curve_editor_set_stroke (editor, stroke);
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gsk_stroke_free (stroke);
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}
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static void
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join_changed (GtkDropDown *combo,
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GParamSpec *pspec,
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CurveEditor *editor)
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{
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GskStroke *stroke;
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stroke = gsk_stroke_copy (curve_editor_get_stroke (editor));
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gsk_stroke_set_line_join (stroke, (GskLineJoin)gtk_drop_down_get_selected (combo));
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curve_editor_set_stroke (editor, stroke);
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gsk_stroke_free (stroke);
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}
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static void
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color_changed (GtkColorDialogButton *button,
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GParamSpec *pspec,
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CurveEditor *editor)
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{
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curve_editor_set_color (editor, gtk_color_dialog_button_get_rgba (button));
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}
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static void
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stroke_toggled (GtkCheckButton *button,
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CurveEditor *editor)
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{
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curve_editor_set_show_outline (editor, gtk_check_button_get_active (button));
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gtk_widget_queue_draw (GTK_WIDGET (editor));
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}
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static void
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limit_changed (GtkSpinButton *spin,
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CurveEditor *editor)
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{
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GskStroke *stroke;
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stroke = gsk_stroke_copy (curve_editor_get_stroke (editor));
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gsk_stroke_set_miter_limit (stroke, gtk_spin_button_get_value (spin));
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curve_editor_set_stroke (editor, stroke);
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gsk_stroke_free (stroke);
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}
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static void
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dashes_changed (GtkEntry *entry,
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GParamSpec *spec,
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CurveEditor *editor)
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{
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const char *text;
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char **split;
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GArray *dash;
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GskStroke *stroke;
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text = gtk_editable_get_text (GTK_EDITABLE (entry));
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split = g_strsplit (text, " ", 0);
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dash = g_array_new (FALSE, FALSE, sizeof (float));
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for (int i = 0; split[i] != NULL; i++)
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{
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double d;
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char *endp = 0;
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d = g_strtod (split[i], &endp);
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if (*endp == '\0')
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g_array_append_vals (dash, (float[1]) { d }, 1);
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}
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g_strfreev (split);
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stroke = gsk_stroke_copy (curve_editor_get_stroke (editor));
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gsk_stroke_set_dash (stroke, (const float *)dash->data, dash->len);
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curve_editor_set_stroke (editor, stroke);
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gsk_stroke_free (stroke);
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g_array_free (dash, TRUE);
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}
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GtkWidget *
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do_curve (GtkWidget *do_widget)
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{
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static GtkWidget *window = NULL;
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GtkWidget *demo;
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GtkWidget *edit_toggle;
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GtkWidget *reset_button;
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GtkWidget *titlebar;
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GtkWidget *stroke_toggle;
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GtkWidget *line_width_spin;
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GtkWidget *stroke_button;
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GtkWidget *popover;
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GtkWidget *grid;
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GtkWidget *cap_combo;
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GtkWidget *join_combo;
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GtkWidget *color_button;
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GtkWidget *limit_spin;
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GtkWidget *dash_entry;
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if (!window)
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{
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window = gtk_window_new ();
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gtk_window_set_title (GTK_WINDOW (window), "Curve Editor");
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g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
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gtk_window_set_default_size (GTK_WINDOW (window), 315, 350);
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edit_toggle = gtk_toggle_button_new ();
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gtk_button_set_icon_name (GTK_BUTTON (edit_toggle), "document-edit-symbolic");
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reset_button = gtk_button_new_from_icon_name ("edit-undo-symbolic");
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stroke_button = gtk_menu_button_new ();
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gtk_menu_button_set_icon_name (GTK_MENU_BUTTON (stroke_button), "open-menu-symbolic");
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popover = gtk_popover_new ();
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gtk_menu_button_set_popover (GTK_MENU_BUTTON (stroke_button), popover);
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grid = gtk_grid_new ();
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gtk_grid_set_row_spacing (GTK_GRID (grid), 6);
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gtk_grid_set_column_spacing (GTK_GRID (grid), 6);
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gtk_popover_set_child (GTK_POPOVER (popover), grid);
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gtk_grid_attach (GTK_GRID (grid), gtk_label_new ("Color:"), 0, 0, 1, 1);
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color_button = gtk_color_dialog_button_new (gtk_color_dialog_new ());
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gtk_grid_attach (GTK_GRID (grid), color_button, 1, 0, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), gtk_label_new ("Line width:"), 0, 1, 1, 1);
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line_width_spin = gtk_spin_button_new_with_range (1, 20, 1);
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gtk_spin_button_set_value (GTK_SPIN_BUTTON (line_width_spin), 1);
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gtk_grid_attach (GTK_GRID (grid), line_width_spin, 1, 1, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), gtk_label_new ("Line cap:"), 0, 2, 1, 1);
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cap_combo = gtk_drop_down_new_from_strings ((const char *[]){"Butt", "Round", "Square", NULL});
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gtk_grid_attach (GTK_GRID (grid), cap_combo, 1, 2, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), gtk_label_new ("Line join:"), 0, 3, 1, 1);
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join_combo = gtk_drop_down_new_from_strings ((const char *[]){"Miter", "Miter-clip", "Round", "Bevel", "Arcs", NULL});
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gtk_grid_attach (GTK_GRID (grid), join_combo, 1, 3, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), gtk_label_new ("Miter limit:"), 0, 4, 1, 1);
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limit_spin = gtk_spin_button_new_with_range (0, 10, 1);
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gtk_spin_button_set_digits (GTK_SPIN_BUTTON (limit_spin), 1);
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gtk_spin_button_set_value (GTK_SPIN_BUTTON (limit_spin), 4);
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gtk_grid_attach (GTK_GRID (grid), limit_spin, 1, 4, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), gtk_label_new ("Dashes:"), 0, 5, 1, 1);
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dash_entry = gtk_entry_new ();
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gtk_grid_attach (GTK_GRID (grid), dash_entry, 1, 5, 1, 1);
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stroke_toggle = gtk_check_button_new_with_label ("Show outline");
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gtk_grid_attach (GTK_GRID (grid), stroke_toggle, 1, 6, 1, 1);
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titlebar = gtk_header_bar_new ();
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gtk_header_bar_pack_start (GTK_HEADER_BAR (titlebar), edit_toggle);
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gtk_header_bar_pack_start (GTK_HEADER_BAR (titlebar), reset_button);
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gtk_header_bar_pack_start (GTK_HEADER_BAR (titlebar), stroke_button);
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gtk_window_set_titlebar (GTK_WINDOW (window), titlebar);
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demo = curve_editor_new ();
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g_signal_connect (stroke_toggle, "toggled", G_CALLBACK (stroke_toggled), demo);
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g_signal_connect (edit_toggle, "notify::active", G_CALLBACK (edit_changed), demo);
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g_signal_connect (reset_button, "clicked", G_CALLBACK (reset), demo);
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g_signal_connect (cap_combo, "notify::selected", G_CALLBACK (cap_changed), demo);
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g_signal_connect (join_combo, "notify::selected", G_CALLBACK (join_changed), demo);
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g_signal_connect (color_button, "notify::rgba", G_CALLBACK (color_changed), demo);
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g_signal_connect (line_width_spin, "value-changed", G_CALLBACK (line_width_changed), demo);
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g_signal_connect (limit_spin, "value-changed", G_CALLBACK (limit_changed), demo);
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g_signal_connect (dash_entry, "notify::text", G_CALLBACK (dashes_changed), demo);
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reset (NULL, CURVE_EDITOR (demo));
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gtk_spin_button_set_value (GTK_SPIN_BUTTON (line_width_spin), 6);
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gtk_color_dialog_button_set_rgba (GTK_COLOR_DIALOG_BUTTON (color_button), &(GdkRGBA) { 1, 0, 0, 1 });
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gtk_drop_down_set_selected (GTK_DROP_DOWN (cap_combo), GSK_LINE_CAP_ROUND);
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gtk_editable_set_text (GTK_EDITABLE (dash_entry), "0 8");
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gtk_window_set_child (GTK_WINDOW (window), demo);
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}
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if (!gtk_widget_get_visible (window))
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gtk_window_present (GTK_WINDOW (window));
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else
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gtk_window_destroy (GTK_WINDOW (window));
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return window;
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}
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