mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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287 lines
7.3 KiB
C
287 lines
7.3 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include <stdio.h>
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#include "gtk/gtk.h"
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#include <math.h>
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/* Backing surface for drawing area */
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static cairo_surface_t *surface = NULL;
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/* Create a new backing surface of the appropriate size */
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static void
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size_allocate (GtkWidget *widget,
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GtkAllocation *allocation,
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int baseline,
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GdkRectangle *clip,
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gpointer data)
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{
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if (surface)
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{
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cairo_surface_destroy (surface);
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surface = NULL;
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}
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if (gtk_widget_get_window (widget))
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{
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cairo_t *cr;
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surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
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CAIRO_CONTENT_COLOR,
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gtk_widget_get_width (widget),
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gtk_widget_get_height (widget));
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cr = cairo_create (surface);
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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cairo_destroy (cr);
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}
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}
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/* Refill the screen from the backing surface */
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static void
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draw (GtkDrawingArea *drawing_area,
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cairo_t *cr,
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int width,
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int height,
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gpointer data)
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{
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_paint (cr);
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}
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/* Draw a rectangle on the screen, size depending on pressure,
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and color on the type of device */
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static void
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draw_brush (GtkWidget *widget, GdkInputSource source,
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gdouble x, gdouble y, gdouble pressure)
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{
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GdkRGBA color;
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GdkRectangle update_rect;
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cairo_t *cr;
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color.alpha = 1.0;
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switch (source)
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{
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case GDK_SOURCE_MOUSE:
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color.red = color.green = 0.0;
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color.blue = 1.0;
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break;
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case GDK_SOURCE_PEN:
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color.red = color.green = color.blue = 0.0;
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break;
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case GDK_SOURCE_ERASER:
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color.red = color.green = color.blue = 1.0;
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break;
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default:
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color.red = color.blue = 0.0;
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color.green = 1.0;
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}
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update_rect.x = x - 10 * pressure;
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update_rect.y = y - 10 * pressure;
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update_rect.width = 20 * pressure;
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update_rect.height = 20 * pressure;
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cr = cairo_create (surface);
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gdk_cairo_set_source_rgba (cr, &color);
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gdk_cairo_rectangle (cr, &update_rect);
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cairo_fill (cr);
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cairo_destroy (cr);
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gtk_widget_queue_draw_area (widget,
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update_rect.x, update_rect.y,
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update_rect.width, update_rect.height);
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}
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static guint32 motion_time;
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static void
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print_axes (GdkDevice *device, gdouble *axes)
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{
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int i;
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if (axes)
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{
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g_print ("%s ", gdk_device_get_name (device));
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for (i = 0; i < gdk_device_get_n_axes (device); i++)
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g_print ("%g ", axes[i]);
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g_print ("\n");
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}
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}
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static void
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drag_begin (GtkGesture *gesture,
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double x,
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double y,
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GtkWidget *widget)
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{
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if (surface != NULL)
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{
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gdouble pressure = 0.5;
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GdkDevice *device;
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gdouble *axes;
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guint n_axes;
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gdouble x, y;
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GdkEvent *event;
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event = gtk_get_current_event ();
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device = gdk_event_get_device (event);
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gdk_event_get_axes (event, &axes, &n_axes);
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gdk_event_get_coords (event, &x, &y);
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print_axes (device, axes);
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gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &pressure);
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draw_brush (widget, gdk_device_get_source (device), x, y, pressure);
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motion_time = gdk_event_get_time ((GdkEvent *)event);
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}
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}
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static gint
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key_press_event (GtkWidget *widget, GdkEventKey *event)
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{
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guint keyval;
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gdk_event_get_keyval ((GdkEvent*)event, &keyval);
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if ((keyval >= 0x20) && (keyval <= 0xFF))
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printf("I got a %c\n", keyval);
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else
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printf("I got some other key\n");
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return TRUE;
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}
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static void
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drag_update (GtkGesture *gesture,
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double x,
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double y,
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GtkWidget *widget)
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{
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GdkModifierType state;
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GdkDevice *device;
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gdouble *axes;
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GdkEvent *event;
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guint n_axes;
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double start_x, start_y;
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event = gtk_get_current_event ();
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gdk_event_get_state (event, &state);
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device = gdk_event_get_device (event);
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gtk_gesture_drag_get_start_point (GTK_GESTURE_DRAG (gesture), &start_x, &start_y);
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if (state & GDK_BUTTON1_MASK && surface != NULL)
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{
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double pressure = 0.5;
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gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &pressure);
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draw_brush (widget, gdk_device_get_source (device), start_x + x, start_y + y, pressure);
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motion_time = gdk_event_get_time (event);
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}
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gdk_event_get_axes (event, &axes, &n_axes);
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print_axes (device, axes);
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}
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void
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quit (void)
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{
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gtk_main_quit ();
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}
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int
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main (int argc, char *argv[])
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{
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GtkWidget *window;
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GtkWidget *drawing_area;
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GtkWidget *vbox;
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GtkWidget *button;
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GtkGesture *gesture;
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gtk_init ();
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_widget_set_name (window, "Test Input");
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vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_container_add (GTK_CONTAINER (window), vbox);
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gtk_widget_show (vbox);
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g_signal_connect (window, "destroy",
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G_CALLBACK (quit), NULL);
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/* Create the drawing area */
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drawing_area = gtk_drawing_area_new ();
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gtk_widget_set_size_request (drawing_area, 200, 200);
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gtk_widget_set_vexpand (drawing_area, TRUE);
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gtk_box_pack_start (GTK_BOX (vbox), drawing_area);
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gtk_widget_show (drawing_area);
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/* Signals used to handle backing surface */
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gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (drawing_area), draw, NULL, NULL);
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g_signal_connect (drawing_area, "size-allocate", G_CALLBACK (size_allocate), NULL);
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gesture = gtk_gesture_drag_new (drawing_area);
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g_object_set_data_full (G_OBJECT (drawing_area), "gesture",
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gesture, g_object_unref);
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g_signal_connect (gesture, "drag-begin",
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G_CALLBACK (drag_begin), drawing_area);
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g_signal_connect (gesture, "drag-update",
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G_CALLBACK (drag_update), drawing_area);
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g_signal_connect (drawing_area, "key_press_event",
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G_CALLBACK (key_press_event), NULL);
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gtk_widget_set_can_focus (drawing_area, TRUE);
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gtk_widget_grab_focus (drawing_area);
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/* .. And create some buttons */
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button = gtk_button_new_with_label ("Quit");
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gtk_box_pack_start (GTK_BOX (vbox), button);
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g_signal_connect_swapped (button, "clicked",
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G_CALLBACK (gtk_widget_destroy),
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window);
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gtk_widget_show (button);
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gtk_widget_show (window);
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gtk_main ();
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return 0;
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}
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