src/ctl_led.cpp

   1 /* Calf DSP Library
   2  * Light emitting diode-like control.
   3  *
   4  * Copyright (C) 2008 Krzysztof Foltman
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General
  17  * Public License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA  02110-1301  USA
  20  */
  21 #include <calf/ctl_led.h>
  22 #include <math.h>
  23 #include <stdint.h>
  24 #include <stdlib.h>
  25 #include <calf/drawingutils.h>
  26
  27 GtkWidget *
  28 calf_led_new()
  29 {
  30     GtkWidget *widget = GTK_WIDGET( g_object_new (CALF_TYPE_LED, NULL ));
  31     return widget;
  32 }
  33
  34 static gboolean
  35 calf_led_expose (GtkWidget *widget, GdkEventExpose *event)
  36 {
  37     g_assert(CALF_IS_LED(widget));
  38
  39     CalfLed *self = CALF_LED(widget);
  40     GdkWindow *window = widget->window;
  41     cairo_t *c = gdk_cairo_create(GDK_DRAWABLE(window));
  42
  43     int width = widget->allocation.width;
  44     int height = widget->allocation.height;
  45     int x  = widget->allocation.x;
  46     int y  = widget->allocation.y;
  47     int ox = widget->style->xthickness;
  48     int oy = widget->style->ythickness;
  49     int sx = width - ox * 2;
  50     int sy = height - oy * 2;
  51     int xc = x + width / 2;
  52     int yc = y + height / 2;
  53     float r, g, b;
  54
  55     if( self->cache_surface == NULL ) {
  56         // looks like its either first call or the widget has been resized.
  57         // create the cache_surface.
  58         self->cache_surface = cairo_image_surface_create( CAIRO_FORMAT_ARGB32, width, height );
  59         cairo_t *cache_cr = cairo_create( self->cache_surface );
  60
  61         float radius, bevel;
  62         get_bg_color(widget, NULL, &r, &g, &b);
  63         gtk_widget_style_get(widget, "border-radius", &radius, "bevel",  &bevel, NULL);
  64         create_rectangle(cache_cr, 0, 0, width, height, radius);
  65         cairo_set_source_rgb(cache_cr, r, g, b);
  66         cairo_fill(cache_cr);
  67         draw_bevel(cache_cr, 0, 0, width, height, radius, bevel);
  68         cairo_rectangle(cache_cr, ox, oy, sx, sy);
  69         cairo_set_source_rgb (cache_cr, 0, 0, 0);
  70         cairo_fill(cache_cr);
  71
  72         cairo_destroy( cache_cr );
  73     }
  74
  75     cairo_set_source_surface( c, self->cache_surface, x, y );
  76     cairo_paint( c );
  77
  78     ox += x;
  79     oy += y;
  80
  81     cairo_pattern_t *pt = cairo_pattern_create_radial(xc, yc, 0, xc, yc, sx > sy ? sx/2 : sy/2);
  82
  83     float value = self->led_value;
  84
  85     if(self->led_mode >= 4 && self->led_mode <= 5 && value > 1.f) {
  86         value = 1.f;
  87     }
  88     switch (self->led_mode) {
  89         default:
  90         case 0:
  91             // blue-on/off
  92             cairo_pattern_add_color_stop_rgb(pt, 0.0, value > 0.f ? 0.2 : 0.0, value > 0.f ? 1.0 : 0.25, value > 0.f ? 1.0 : 0.35);
  93             cairo_pattern_add_color_stop_rgb(pt, 0.5, value > 0.f ? 0.1 : 0.0, value > 0.f ? 0.6 : 0.15, value > 0.f ? 0.75 : 0.2);
  94             cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0,                     value > 0.f ? 0.3 : 0.1,  value > 0.f ? 0.5 : 0.1);
  95             break;
  96         case 1:
  97             // red-on/off
  98             cairo_pattern_add_color_stop_rgb(pt, 0.0, value > 0.f ? 1.0 : 0.35, value > 0.f ? 0.5 : 0.0, value > 0.f ? 0.2 : 0.0);
  99             cairo_pattern_add_color_stop_rgb(pt, 0.5, value > 0.f ? 0.80 : 0.2, value > 0.f ? 0.2 : 0.0, value > 0.f ? 0.1 : 0.0);
 100             cairo_pattern_add_color_stop_rgb(pt, 1.0, value > 0.f ? 0.65 : 0.1, value > 0.f ? 0.1 : 0.0, 0.0);
 101             break;
 102         case 2:
 103         case 4:
 104             // blue-dynamic (limited)
 105             cairo_pattern_add_color_stop_rgb(pt, 0.0, value * 0.2, value * 0.75 + 0.25, value * 0.65 + 0.35);
 106             cairo_pattern_add_color_stop_rgb(pt, 0.5, value * 0.1, value * 0.45 + 0.15, value * 0.55 + 0.2);
 107             cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0,         value * 0.2 + 0.1,   value * 0.4 + 0.1);
 108             break;
 109         case 3:
 110         case 5:
 111             // red-dynamic (limited)
 112             cairo_pattern_add_color_stop_rgb(pt, 0.0, value * 0.65 + 0.35, value * 0.5, value * 0.2);
 113             cairo_pattern_add_color_stop_rgb(pt, 0.5, value * 0.6 + 0.2,   value * 0.2, value * 0.1);
 114             cairo_pattern_add_color_stop_rgb(pt, 1.0, value * 0.66 + 0.1,  value * 0.1, 0.0);
 115             break;
 116         case 6:
 117             // blue-dynamic with red peak at >= 1.f
 118             if(value < 1.0) {
 119                 cairo_pattern_add_color_stop_rgb(pt, 0.0, value * 0.2, value * 0.75 + 0.25, value * 0.65 + 0.35);
 120                 cairo_pattern_add_color_stop_rgb(pt, 0.5, value * 0.1, value * 0.45 + 0.15, value * 0.55 + 0.2);
 121                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0,         value * 0.2 + 0.1,   value * 0.4 + 0.1);
 122             } else {
 123                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 1.0,  0.5, 0.2);
 124                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.80, 0.2, 0.1);
 125                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.66, 0.1, 0.0);
 126             }
 127             break;
 128         case 7:
 129             // off @ 0.0, blue < 1.0, red @ 1.0
 130             if(value < 1.f and value > 0.f) {
 131                 // blue
 132                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 0.2, 1.0, 1.0);
 133                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.1, 0.6, 0.75);
 134                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0, 0.3, 0.5);
 135             } else if(value == 0.f) {
 136                 // off
 137                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 0.0, 0.25, 0.35);
 138                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.0, 0.15, 0.2);
 139                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0, 0.1,  0.1);
 140             } else {
 141                 // red
 142                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 1.0,  0.5, 0.2);
 143                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.80, 0.2, 0.1);
 144                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.66, 0.1, 0.0);
 145             }
 146             break;
 147     }
 148
 149     cairo_rectangle(c, ox + 1, oy + 1, sx - 2, sy - 2);
 150     cairo_set_source (c, pt);
 151     cairo_fill_preserve(c);
 152
 153     pt = cairo_pattern_create_linear (ox, oy, ox, oy + sy);
 154     cairo_pattern_add_color_stop_rgba (pt, 0,     1, 1, 1, 0.4);
 155     cairo_pattern_add_color_stop_rgba (pt, 0.4,   1, 1, 1, 0.1);
 156     cairo_pattern_add_color_stop_rgba (pt, 0.401, 0, 0, 0, 0.0);
 157     cairo_pattern_add_color_stop_rgba (pt, 1,     0, 0, 0, 0.2);
 158     cairo_set_source (c, pt);
 159     cairo_fill(c);
 160     cairo_pattern_destroy(pt);
 161
 162     cairo_destroy(c);
 163
 164     return TRUE;
 165 }
 166
 167 static void
 168 calf_led_size_request (GtkWidget *widget,
 169                            GtkRequisition *requisition)
 170 {
 171     g_assert(CALF_IS_LED(widget));
 172     CalfLed *self = CALF_LED(widget);
 173     requisition->width = self->size ? 24 : 19;
 174     requisition->height = self->size ? 18 : 14;
 175 }
 176
 177 static void
 178 calf_led_size_allocate (GtkWidget *widget,
 179                            GtkAllocation *allocation)
 180 {
 181     g_assert(CALF_IS_LED(widget));
 182     CalfLed *led = CALF_LED(widget);
 183
 184     GtkWidgetClass *parent_class = (GtkWidgetClass *) g_type_class_peek_parent( CALF_LED_GET_CLASS( led ) );
 185     parent_class->size_allocate( widget, allocation );
 186
 187     if( led->cache_surface )
 188         cairo_surface_destroy( led->cache_surface );
 189     led->cache_surface = NULL;
 190 }
 191
 192 static gboolean
 193 calf_led_button_press (GtkWidget *widget, GdkEventButton *event)
 194 {
 195     return TRUE;
 196 }
 197
 198 static void
 199 calf_led_class_init (CalfLedClass *klass)
 200 {
 201     GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
 202     widget_class->expose_event = calf_led_expose;
 203     widget_class->size_request = calf_led_size_request;
 204     widget_class->size_allocate = calf_led_size_allocate;
 205     widget_class->button_press_event = calf_led_button_press;
 206     gtk_widget_class_install_style_property(
 207         widget_class, g_param_spec_float("border-radius", "Border Radius", "Generate round edges",
 208         0, 24, 4, GParamFlags(G_PARAM_READWRITE)));
 209     gtk_widget_class_install_style_property(
 210         widget_class, g_param_spec_float("bevel", "Bevel", "Bevel the object",
 211         -2, 2, 0.2, GParamFlags(G_PARAM_READWRITE)));
 212 }
 213
 214 static void
 215 calf_led_init (CalfLed *self)
 216 {
 217     GtkWidget *widget = GTK_WIDGET(self);
 218     // GtkWidget *widget = GTK_WIDGET(self);
 219     // GTK_WIDGET_SET_FLAGS (widget, GTK_CAN_FOCUS);
 220     self->led_mode = 0;
 221     self->size = 0;
 222     self->led_value = 0.f;
 223     self->cache_surface = NULL;
 224     widget->requisition.width = self->size ? 24 : 19;
 225     widget->requisition.height = self->size ? 18 : 14;
 226     gtk_widget_set_has_window(widget, FALSE);
 227 }
 228
 229 void calf_led_set_value(CalfLed *led, float value)
 230 {
 231     if (value != led->led_value)
 232     {
 233         float old_value = led->led_value;
 234         led->led_value = value;
 235         if (led->led_mode >= 2 || (old_value > 0) != (value > 0))
 236         {
 237             GtkWidget *widget = GTK_WIDGET (led);
 238             if (GTK_WIDGET_REALIZED(widget))
 239                 gtk_widget_queue_draw (widget);
 240         }
 241     }
 242 }
 243
 244 gboolean calf_led_get_value(CalfLed *led)
 245 {
 246     return led->led_value;
 247 }
 248
 249 GType
 250 calf_led_get_type (void)
 251 {
 252     static GType type = 0;
 253     if (!type) {
 254         static const GTypeInfo type_info = {
 255             sizeof(CalfLedClass),
 256             NULL, /* base_init */
 257             NULL, /* base_finalize */
 258             (GClassInitFunc)calf_led_class_init,
 259             NULL, /* class_finalize */
 260             NULL, /* class_data */
 261             sizeof(CalfLed),
 262             0,    /* n_preallocs */
 263             (GInstanceInitFunc)calf_led_init
 264         };
 265
 266         for (int i = 0; ; i++) {
 267             //const char *name = "CalfLed";
 268             char *name = g_strdup_printf("CalfLed%u%d",
 269                 ((unsigned int)(intptr_t)calf_led_class_init) >> 16, i);
 270             if (g_type_from_name(name)) {
 271                 free(name);
 272                 continue;
 273             }
 274             type = g_type_register_static(GTK_TYPE_DRAWING_AREA,
 275                                           name,
 276                                           &type_info,
 277                                           (GTypeFlags)0);
 278             free(name);
 279             break;
 280         }
 281     }
 282     return type;
 283 }