* viking -- GPS Data and Topo Analyzer, Explorer, and Manager
*
* Copyright (C) 2003-2007, Evan Battaglia <gtoevan@gmx.net>
+ * Copyright (C) 2013, Rob Norris <rw_norris@hotmail.com>
*
* Lat/Lon plotting functions calcxy* are from GPSDrive
* GPSDrive Copyright (C) 2001-2004 Fritz Ganter <ganter@ganter.at>
#include "vikcoord.h"
#include "vikwindow.h"
#include "vikviewport.h"
-
#include "mapcoord.h"
/* for ALTI_TO_MPP */
#include "globals.h"
+#include "settings.h"
+#include "dialog.h"
+
+#define MERCATOR_FACTOR(x) ( (65536.0 / 180 / (x)) * 256.0 )
static gdouble EASTING_OFFSET = 500000.0;
static void viewport_finalize ( GObject *gob );
static void viewport_utm_zone_check ( VikViewport *vvp );
+static void update_centers ( VikViewport *vvp );
+static void free_centers ( VikViewport *vvp, guint start );
static gboolean calcxy(double *x, double *y, double lg, double lt, double zero_long, double zero_lat, double pixelfact_x, double pixelfact_y, gint mapSizeX2, gint mapSizeY2 );
static gboolean calcxy_rev(double *lg, double *lt, gint x, gint y, double zero_long, double zero_lat, double pixelfact_x, double pixelfact_y, gint mapSizeX2, gint mapSizeY2 );
static GObjectClass *parent_class;
-
struct _VikViewport {
GtkDrawingArea drawing_area;
GdkPixmap *scr_buffer;
gint width, height;
+ gint width_2, height_2; // Half of the normal width and height
VikCoord center;
VikCoordMode coord_mode;
gdouble xmpp, ympp;
+ gdouble xmfactor, ymfactor;
+ GList *centers; // The history of requested positions (of VikCoord type)
+ guint centers_index; // current position within the history list
+ guint centers_max; // configurable maximum size of the history list
+ guint centers_radius; // Metres
GdkPixbuf *alpha_pixbuf;
guint8 alpha_pixbuf_width;
return 0.0;
}
+enum {
+ VW_UPDATED_CENTER_SIGNAL = 0,
+ VW_LAST_SIGNAL,
+};
+static guint viewport_signals[VW_LAST_SIGNAL] = { 0 };
+
G_DEFINE_TYPE (VikViewport, vik_viewport, GTK_TYPE_DRAWING_AREA)
static void
object_class->finalize = viewport_finalize;
parent_class = g_type_class_peek_parent (klass);
+
+ viewport_signals[VW_UPDATED_CENTER_SIGNAL] = g_signal_new ( "updated_center", G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (VikViewportClass, updated_center), NULL, NULL,
+ g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
}
VikViewport *vik_viewport_new ()
return vv;
}
+#define VIK_SETTINGS_VIEW_LAST_LATITUDE "viewport_last_latitude"
+#define VIK_SETTINGS_VIEW_LAST_LONGITUDE "viewport_last_longitude"
+#define VIK_SETTINGS_VIEW_LAST_ZOOM_X "viewport_last_zoom_xpp"
+#define VIK_SETTINGS_VIEW_LAST_ZOOM_Y "viewport_last_zoom_ypp"
+#define VIK_SETTINGS_VIEW_HISTORY_SIZE "viewport_history_size"
+#define VIK_SETTINGS_VIEW_HISTORY_DIFF_DIST "viewport_history_diff_dist"
+
static void
vik_viewport_init ( VikViewport *vvp )
{
struct LatLon ll;
ll.lat = a_vik_get_default_lat();
ll.lon = a_vik_get_default_long();
+ gdouble zoom_x = 4.0;
+ gdouble zoom_y = 4.0;
+
+ if ( a_vik_get_startup_method ( ) == VIK_STARTUP_METHOD_LAST_LOCATION ) {
+ gdouble lat, lon, dzoom;
+ if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_LATITUDE, &lat ) )
+ ll.lat = lat;
+ if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_LONGITUDE, &lon ) )
+ ll.lon = lon;
+ if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_X, &dzoom ) )
+ zoom_x = dzoom;
+ if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_Y, &dzoom ) )
+ zoom_y = dzoom;
+ }
+
a_coords_latlon_to_utm ( &ll, &utm );
- /* TODO: not static */
- vvp->xmpp = 4.0;
- vvp->ympp = 4.0;
+ vvp->xmpp = zoom_x;
+ vvp->ympp = zoom_y;
+ vvp->xmfactor = MERCATOR_FACTOR (vvp->xmpp);
+ vvp->ymfactor = MERCATOR_FACTOR (vvp->ympp);
vvp->coord_mode = VIK_COORD_LATLON;
vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
vvp->center.mode = VIK_COORD_LATLON;
vvp->scale_bg_gc = NULL;
vvp->copyrights = NULL;
+ vvp->centers = NULL;
+ vvp->centers_index = 0;
+ vvp->centers_max = 20;
+ gint tmp = vvp->centers_max;
+ if ( a_settings_get_integer ( VIK_SETTINGS_VIEW_HISTORY_SIZE, &tmp ) )
+ vvp->centers_max = tmp;
+ vvp->centers_radius = 500;
+ if ( a_settings_get_integer ( VIK_SETTINGS_VIEW_HISTORY_DIFF_DIST, &tmp ) )
+ vvp->centers_radius = tmp;
vvp->draw_scale = TRUE;
vvp->draw_centermark = TRUE;
vvp->snapshot_buffer = NULL;
vvp->half_drawn = FALSE;
+ // Initiate center history
+ update_centers ( vvp );
+
g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
+#if GTK_CHECK_VERSION (2,18,0)
+ gtk_widget_set_can_focus ( GTK_WIDGET(vvp), TRUE );
+#else
GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
+#endif
}
GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
GdkGC *rv = NULL;
GdkColor color;
- rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
+ rv = gdk_gc_new ( gtk_widget_get_window(GTK_WIDGET(vvp)) );
if ( gdk_color_parse ( colorname, &color ) )
gdk_gc_set_rgb_fg_color ( rv, &color );
else
{
GdkGC *rv;
- rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
+ rv = gdk_gc_new ( gtk_widget_get_window(GTK_WIDGET(vvp)) );
gdk_gc_set_rgb_fg_color ( rv, color );
gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
return rv;
{
vvp->width = width;
vvp->height = height;
+
+ vvp->width_2 = vvp->width/2;
+ vvp->height_2 = vvp->height/2;
+
if ( vvp->scr_buffer )
g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
- vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
+ vvp->scr_buffer = gdk_pixmap_new ( gtk_widget_get_window(GTK_WIDGET(vvp)), vvp->width, vvp->height, -1 );
/* TODO trigger: only if this is enabled !!! */
if ( vvp->snapshot_buffer )
g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
- vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
+ vvp->snapshot_buffer = gdk_pixmap_new ( gtk_widget_get_window(GTK_WIDGET(vvp)), vvp->width, vvp->height, -1 );
}
{
g_return_val_if_fail ( vvp != NULL, TRUE );
- vvp->width = GTK_WIDGET(vvp)->allocation.width;
- vvp->height = GTK_WIDGET(vvp)->allocation.height;
+ GtkAllocation allocation;
+ gtk_widget_get_allocation ( GTK_WIDGET(vvp), &allocation );
+ vvp->width = allocation.width;
+ vvp->height = allocation.height;
+
+ vvp->width_2 = vvp->width/2;
+ vvp->height_2 = vvp->height/2;
if ( vvp->scr_buffer )
g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
- vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
+ vvp->scr_buffer = gdk_pixmap_new ( gtk_widget_get_window(GTK_WIDGET(vvp)), vvp->width, vvp->height, -1 );
/* TODO trigger: only if enabled! */
if ( vvp->snapshot_buffer )
g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
- vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
+ vvp->snapshot_buffer = gdk_pixmap_new ( gtk_widget_get_window(GTK_WIDGET(vvp)), vvp->width, vvp->height, -1 );
/* TODO trigger */
/* this is down here so it can get a GC (necessary?) */
g_return_if_fail ( vvp != NULL );
+ if ( a_vik_get_startup_method ( ) == VIK_STARTUP_METHOD_LAST_LOCATION ) {
+ struct LatLon ll;
+ vik_coord_to_latlon ( &(vvp->center), &ll );
+ a_settings_set_double ( VIK_SETTINGS_VIEW_LAST_LATITUDE, ll.lat );
+ a_settings_set_double ( VIK_SETTINGS_VIEW_LAST_LONGITUDE, ll.lon );
+ a_settings_set_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_X, vvp->xmpp );
+ a_settings_set_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_Y, vvp->ympp );
+ }
+
+ if ( vvp->centers )
+ free_centers ( vvp, 0 );
+
if ( vvp->scr_buffer )
g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
// in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
base = VIK_METERS_TO_MILES(vik_coord_diff ( &left, &right )) * 10.0;
break;
+ case VIK_UNITS_DISTANCE_NAUTICAL_MILES:
+ // in 0.1 NM (copes better when zoomed in as 1 NM can be too big)
+ base = VIK_METERS_TO_NAUTICAL_MILES(vik_coord_diff ( &left, &right )) * 10.0;
+ break;
default:
base = 1; // Keep the compiler happy
g_critical("Houston, we've had a problem. distance=%d", dist_units);
vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
/* black scale */
- vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
+ vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
- vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
+ vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
- vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
+ vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
if (odd%2) {
int i;
for (i=1; i<5; i++) {
vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
- vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
+ vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
}
} else {
for (i=1; i<10; i++) {
vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
- vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
+ vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
}
}
pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
- pango_layout_set_font_description (pl, GTK_WIDGET(&vvp->drawing_area)->style->font_desc);
+ pango_layout_set_font_description (pl, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->font_desc);
switch (dist_units) {
case VIK_UNITS_DISTANCE_KILOMETRES:
if (unit >= 1000) {
- sprintf(s, "%d km", (int)unit/1000);
+ sprintf(s, "%d km", (int)unit/1000);
} else {
- sprintf(s, "%d m", (int)unit);
+ sprintf(s, "%d m", (int)unit);
}
break;
case VIK_UNITS_DISTANCE_MILES:
// Handle units in 0.1 miles
if (unit < 10.0) {
- sprintf(s, "%0.1f miles", unit/10.0);
+ sprintf(s, "%0.1f miles", unit/10.0);
+ }
+ else if ((int)unit == 10.0) {
+ sprintf(s, "1 mile");
+ }
+ else {
+ sprintf(s, "%d miles", (int)(unit/10.0));
+ }
+ break;
+ case VIK_UNITS_DISTANCE_NAUTICAL_MILES:
+ // Handle units in 0.1 NM
+ if (unit < 10.0) {
+ sprintf(s, "%0.1f NM", unit/10.0);
}
else if ((int)unit == 10.0) {
- sprintf(s, "1 mile");
+ sprintf(s, "1 NM");
}
else {
- sprintf(s, "%d miles", (int)(unit/10.0));
+ sprintf(s, "%d NMs", (int)(unit/10.0));
}
break;
default:
g_critical("Houston, we've had a problem. distance=%d", dist_units);
}
pango_layout_set_text(pl, s, -1);
- vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
+ vik_viewport_draw_layout(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
PAD + len + PAD, vvp->height - PAD - 10, pl);
g_object_unref(pl);
pl = NULL;
/* create pango layout */
pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
- pango_layout_set_font_description (pl, GTK_WIDGET(&vvp->drawing_area)->style->font_desc);
+ pango_layout_set_font_description (pl, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->font_desc);
pango_layout_set_alignment ( pl, PANGO_ALIGN_RIGHT );
/* Set the text */
/* Use maximum of half the viewport width */
pango_layout_set_width ( pl, ( vvp->width / 2 ) * PANGO_SCALE );
pango_layout_get_pixel_extents(pl, &ink_rect, &logical_rect);
- vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
+ vik_viewport_draw_layout(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
vvp->width / 2, vvp->height - logical_rect.height, pl);
/* Free memory */
const int gap = 4;
int center_x = vvp->width/2;
int center_y = vvp->height/2;
- GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
+ GdkGC * black_gc = gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc;
/* white back ground */
vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
void vik_viewport_sync ( VikViewport *vvp )
{
g_return_if_fail ( vvp != NULL );
- gdk_draw_drawable(GTK_WIDGET(vvp)->window, GTK_WIDGET(vvp)->style->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, 0, 0, vvp->width, vvp->height);
+ gdk_draw_drawable(gtk_widget_get_window(GTK_WIDGET(vvp)), gtk_widget_get_style(GTK_WIDGET(vvp))->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, 0, 0, vvp->width, vvp->height);
}
void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
gint x, y, wid, hei;
g_return_if_fail ( vvp != NULL );
- gdk_draw_drawable(GTK_WIDGET(vvp)->window, GTK_WIDGET(vvp)->style->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, x_off, y_off, vvp->width, vvp->height);
+ gdk_draw_drawable(gtk_widget_get_window(GTK_WIDGET(vvp)), gtk_widget_get_style(GTK_WIDGET(vvp))->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, x_off, y_off, vvp->width, vvp->height);
if (x_off >= 0) {
x = 0;
void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
{
g_return_if_fail ( vvp != NULL );
- if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
+ if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM ) {
vvp->xmpp = vvp->ympp = xympp;
+ // Since xmpp & ympp are the same it doesn't matter which one is used here
+ vvp->xmfactor = vvp->ymfactor = MERCATOR_FACTOR(vvp->xmpp);
+ }
if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
viewport_utm_zone_check(vvp);
vvp->xmpp /= 2;
vvp->ympp /= 2;
+ vvp->xmfactor = MERCATOR_FACTOR(vvp->xmpp);
+ vvp->ymfactor = MERCATOR_FACTOR(vvp->ympp);
+
viewport_utm_zone_check(vvp);
}
}
vvp->xmpp *= 2;
vvp->ympp *= 2;
+ vvp->xmfactor = MERCATOR_FACTOR(vvp->xmpp);
+ vvp->ymfactor = MERCATOR_FACTOR(vvp->ympp);
+
viewport_utm_zone_check(vvp);
}
}
{
if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
vvp->xmpp = xmpp;
+ vvp->ymfactor = MERCATOR_FACTOR(vvp->ympp);
if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
viewport_utm_zone_check(vvp);
}
{
if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
vvp->ympp = ympp;
+ vvp->ymfactor = MERCATOR_FACTOR(vvp->ympp);
if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
viewport_utm_zone_check(vvp);
}
}
}
-void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
+/**
+ * Free an individual center position in the history list
+ */
+static void free_center ( VikViewport *vvp, guint index )
+{
+ VikCoord *coord = g_list_nth_data ( vvp->centers, index );
+ if ( coord )
+ g_free ( coord );
+ GList *gl = g_list_nth ( vvp->centers, index );
+ if ( gl )
+ vvp->centers = g_list_delete_link ( vvp->centers, gl );
+}
+
+/**
+ * Free a set of center positions in the history list,
+ * from the indicated start index to the end of the list
+ */
+static void free_centers ( VikViewport *vvp, guint start )
+{
+ // Have to work backward since we delete items referenced by the '_nth()' values,
+ // otherwise if processed forward - removing the lower nth index entries would change the subsequent indexing
+ for ( guint i = g_list_length(vvp->centers)-1; i > start; i-- )
+ free_center ( vvp, i );
+}
+
+/**
+ * Store the current center position into the history list
+ * and emit a signal to notify clients the list has been updated
+ */
+static void update_centers ( VikViewport *vvp )
+{
+ VikCoord *new_center = g_malloc(sizeof (VikCoord));
+ *new_center = vvp->center;
+
+ if ( vvp->centers_index ) {
+
+ if ( vvp->centers_index == vvp->centers_max-1 ) {
+ // List is full, so drop the oldest value to make room for the new one
+ free_center ( vvp, 0 );
+ vvp->centers_index--;
+ }
+ else {
+ // Reset the now unused section of the list
+ // Free from the index to the end
+ free_centers ( vvp, vvp->centers_index+1 );
+ }
+
+ }
+
+ // Store new position
+ // NB ATM this can be the same location as the last one in the list
+ vvp->centers = g_list_append ( vvp->centers, new_center );
+
+ // Reset to the end (NB should be same as centers_index++)
+ vvp->centers_index = g_list_length ( vvp->centers ) - 1;
+
+ // Inform interested subscribers that this change has occurred
+ g_signal_emit ( G_OBJECT(vvp), viewport_signals[VW_UPDATED_CENTER_SIGNAL], 0 );
+}
+
+/**
+ * Show the list of forward/backward positions
+ * ATM only for debug usage
+ */
+void vik_viewport_show_centers ( VikViewport *vvp, GtkWindow *parent )
+{
+ GList* node = NULL;
+ GList* texts = NULL;
+ gint index = 0;
+ for (node = vvp->centers; node != NULL; node = g_list_next(node)) {
+ gchar *lat = NULL, *lon = NULL;
+ struct LatLon ll;
+ vik_coord_to_latlon (node->data, &ll);
+ a_coords_latlon_to_string ( &ll, &lat, &lon );
+ gchar *extra = NULL;
+ if ( index == vvp->centers_index-1 )
+ extra = g_strdup ( " [Back]" );
+ else if ( index == vvp->centers_index+1 )
+ extra = g_strdup ( " [Forward]" );
+ else
+ extra = g_strdup ( "" );
+ texts = g_list_prepend ( texts , g_strdup_printf ( "%s %s%s", lat, lon, extra ) );
+ g_free ( lat );
+ g_free ( lon );
+ g_free ( extra );
+ index++;
+ }
+
+ // NB: No i18n as this is just for debug
+ // Using this function the dialog allows sorting of the list which isn't appropriate here
+ // but this doesn't matter much for debug purposes of showing stuff...
+ GList *ans = a_dialog_select_from_list(parent,
+ texts,
+ FALSE,
+ "Back/Forward Locations",
+ "Back/Forward Locations");
+ for (node = ans; node != NULL; node = g_list_next(node))
+ g_free(node->data);
+ g_list_free(ans);
+ for (node = texts; node != NULL; node = g_list_next(node))
+ g_free(node->data);
+ g_list_free(texts);
+}
+
+/**
+ * vik_viewport_go_back:
+ *
+ * Move back in the position history
+ *
+ * Returns: %TRUE one success
+ */
+gboolean vik_viewport_go_back ( VikViewport *vvp )
+{
+ // see if the current position is different from the last saved center position within a certain radius
+ VikCoord *center = g_list_nth_data ( vvp->centers, vvp->centers_index );
+ if ( center ) {
+ // Consider an exclusion size (should it zoom level dependent, rather than a fixed value?)
+ // When still near to the last saved position we'll jump over it to the one before
+ if ( vik_coord_diff ( center, &vvp->center ) > vvp->centers_radius ) {
+
+ if ( vvp->centers_index == g_list_length(vvp->centers)-1 ) {
+ // Only when we haven't already moved back in the list
+ // Remember where this request came from
+ // (alternatively we could insert in the list on every back attempt)
+ update_centers ( vvp );
+ }
+
+ }
+ // 'Go back' if possible
+ // NB if we inserted a position above, then this will then move to the last saved position
+ // otherwise this will skip to the previous saved position, as it's probably somewhere else.
+ if ( vvp->centers_index > 0 )
+ vvp->centers_index--;
+ }
+ else {
+ return FALSE;
+ }
+
+ VikCoord *new_center = g_list_nth_data ( vvp->centers, vvp->centers_index );
+ if ( new_center ) {
+ vik_viewport_set_center_coord ( vvp, new_center, FALSE );
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/**
+ * vik_viewport_go_forward:
+ *
+ * Move forward in the position history
+ *
+ * Returns: %TRUE one success
+ */
+gboolean vik_viewport_go_forward ( VikViewport *vvp )
+{
+ if ( vvp->centers_index == vvp->centers_max-1 )
+ return FALSE;
+
+ vvp->centers_index++;
+ VikCoord *new_center = g_list_nth_data ( vvp->centers, vvp->centers_index );
+ if ( new_center ) {
+ vik_viewport_set_center_coord ( vvp, new_center, FALSE );
+ return TRUE;
+ }
+ else
+ // Set to end of list
+ vvp->centers_index = g_list_length(vvp->centers) - 1;
+
+ return FALSE;
+}
+
+/**
+ * vik_viewport_back_available:
+ *
+ * Returns: %TRUE when a previous position in the history is available
+ */
+gboolean vik_viewport_back_available ( const VikViewport *vvp )
+{
+ return ( vvp->centers_index > 0 );
+}
+
+/**
+ * vik_viewport_forward_available:
+ *
+ * Returns: %TRUE when a next position in the history is available
+ */
+gboolean vik_viewport_forward_available ( const VikViewport *vvp )
+{
+ return ( vvp->centers_index < g_list_length(vvp->centers)-1 );
+}
+
+/**
+ * vik_viewport_set_center_latlon:
+ * @vvp: The viewport to reposition.
+ * @ll: The new center position in Lat/Lon format
+ * @save_position: Whether this new position should be saved into the history of positions
+ * Normally only specific user requests should be saved (i.e. to not include Pan and Zoom repositions)
+ */
+void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll, gboolean save_position )
{
vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
+ if ( save_position )
+ update_centers ( vvp );
if ( vvp->coord_mode == VIK_COORD_UTM )
viewport_utm_zone_check ( vvp );
}
-void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
+/**
+ * vik_viewport_set_center_utm:
+ * @vvp: The viewport to reposition.
+ * @utm: The new center position in UTM format
+ * @save_position: Whether this new position should be saved into the history of positions
+ * Normally only specific user requests should be saved (i.e. to not include Pan and Zoom repositions)
+ */
+void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm, gboolean save_position )
{
vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
+ if ( save_position )
+ update_centers ( vvp );
if ( vvp->coord_mode == VIK_COORD_UTM )
viewport_utm_zone_check ( vvp );
}
-void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
+/**
+ * vik_viewport_set_center_coord:
+ * @vvp: The viewport to reposition.
+ * @coord: The new center position in a VikCoord type
+ * @save_position: Whether this new position should be saved into the history of positions
+ * Normally only specific user requests should be saved (i.e. to not include Pan and Zoom repositions)
+ */
+void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord, gboolean save_position )
{
vvp->center = *coord;
+ if ( save_position )
+ update_centers ( vvp );
if ( vvp->coord_mode == VIK_COORD_UTM )
viewport_utm_zone_check ( vvp );
}
} else {
VikCoord tmp;
vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
- vik_viewport_set_center_coord ( vvp, &tmp );
+ vik_viewport_set_center_coord ( vvp, &tmp, FALSE );
}
}
utm->zone = vvp->center.utm_zone;
utm->letter = vvp->center.utm_letter;
- utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
+ utm->easting = ( ( x - ( vvp->width_2) ) * vvp->xmpp ) + vvp->center.east_west;
zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
utm->zone += zone_delta;
utm->easting -= zone_delta * vvp->utm_zone_width;
- utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
+ utm->northing = ( ( ( vvp->height_2) - y ) * vvp->ympp ) + vvp->center.north_south;
} else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
coord->mode = VIK_COORD_LATLON;
if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
- coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
- coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
+ coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width_2));
+ coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height_2 - y));
} else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
- calcxy_rev(&(coord->east_west), &(coord->north_south), x, y, vvp->center.east_west, vvp->center.north_south, vvp->xmpp * ALTI_TO_MPP, vvp->ympp * ALTI_TO_MPP, vvp->width/2, vvp->height/2);
+ calcxy_rev(&(coord->east_west), &(coord->north_south), x, y, vvp->center.east_west, vvp->center.north_south, vvp->xmpp * ALTI_TO_MPP, vvp->ympp * ALTI_TO_MPP, vvp->width_2, vvp->height_2);
else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
- /* FIXMERCATOR */
- coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
- coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
-
-#if 0
---> THIS IS JUNK HERE.
- *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
-
- (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
- DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
-#endif
+ /* This isn't called with a high frequently so less need to optimize */
+ coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width_2));
+ coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height_2 - y)) );
}
}
}
+/*
+ * Since this function is used for every drawn trackpoint - it can get called alot
+ * Thus x & y position factors are calculated once on zoom changes,
+ * avoiding the need to do it here all the time.
+ * For good measure the half width and height values are also pre calculated too.
+ */
void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
{
static VikCoord tmp;
return;
}
- *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
+ *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width_2) -
(center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
- *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
+ *y = (vvp->height_2) - ( (utm->northing - center->northing) / vvp->ympp );
} else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
struct LatLon *center = (struct LatLon *) &(vvp->center);
struct LatLon *ll = (struct LatLon *) coord;
double xx,yy;
if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
- /* FIXMERCATOR: Optimize */
- *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
- *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
+ *x = vvp->width_2 + ( MERCATOR_FACTOR(vvp->xmpp) * (ll->lon - center->lon) );
+ *y = vvp->height_2 + ( MERCATOR_FACTOR(vvp->ympp) * (center->lat - ll->lat) );
} else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
- calcxy ( &xx, &yy, center->lon, center->lat, ll->lon, ll->lat, vvp->xmpp * ALTI_TO_MPP, vvp->ympp * ALTI_TO_MPP, vvp->width / 2, vvp->height / 2 );
+ calcxy ( &xx, &yy, center->lon, center->lat, ll->lon, ll->lat, vvp->xmpp * ALTI_TO_MPP, vvp->ympp * ALTI_TO_MPP, vvp->width_2, vvp->height_2 );
*x = xx; *y = yy;
} else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
- /* FIXMERCATOR: Optimize */
- *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
- *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
+ *x = vvp->width_2 + ( MERCATOR_FACTOR(vvp->xmpp) * (ll->lon - center->lon) );
+ *y = vvp->height_2 + ( MERCATOR_FACTOR(vvp->ympp) * ( MERCLAT(center->lat) - MERCLAT(ll->lat) ) );
}
}
}
-void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
+// Clip functions continually reduce the value by a factor until it is in the acceptable range
+// whilst also scaling the other coordinate value.
+static void clip_x ( gint *x1, gint *y1, gint *x2, gint *y2 )
{
- if ( *x1 > 20000 || *x1 < -20000 ) {
- gdouble shrinkfactor = ABS(20000.0 / *x1);
- *x1 = *x2 + (shrinkfactor * (*x1-*x2));
- *y1 = *y2 + (shrinkfactor * (*y1-*y2));
- } else if ( *y1 > 20000 || *y1 < -20000 ) {
- gdouble shrinkfactor = ABS(20000.0 / *x1);
- *x1 = *x2 + (shrinkfactor * (*x1-*x2));
- *y1 = *y2 + (shrinkfactor * (*y1-*y2));
- } else if ( *x2 > 20000 || *x2 < -20000 ) {
- gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
- *x2 = *x1 + (shrinkfactor * (*x2-*x1));
- *y2 = *y1 + (shrinkfactor * (*y2-*y1));
- } else if ( *y2 > 20000 || *y2 < -20000 ) {
- gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
- *x2 = *x1 + (shrinkfactor * (*x2-*x1));
- *y2 = *y1 + (shrinkfactor * (*y2-*y1));
+ while ( ABS(*x1) > 32768 ) {
+ *x1 = *x2 + (0.5 * (*x1-*x2));
+ *y1 = *y2 + (0.5 * (*y1-*y2));
}
}
+static void clip_y ( gint *x1, gint *y1, gint *x2, gint *y2 )
+{
+ while ( ABS(*y1) > 32767 ) {
+ *x1 = *x2 + (0.5 * (*x1-*x2));
+ *y1 = *y2 + (0.5 * (*y1-*y2));
+ }
+}
+
+/**
+ * a_viewport_clip_line:
+ * @x1: screen coord
+ * @y1: screen coord
+ * @x2: screen coord
+ * @y2: screen coord
+ *
+ * Due to the seemingly undocumented behaviour of gdk_draw_line(), we need to restrict the range of values passed in.
+ * So despite it accepting gints, the effective range seems to be the actually the minimum C int range (2^16).
+ * This seems to be limitations coming from the X Window System.
+ *
+ * See http://www.rahul.net/kenton/40errs.html
+ * ERROR 7. Boundary conditions.
+ * "The X coordinate space is not infinite.
+ * Most drawing functions limit position, width, and height to 16 bit integers (sometimes signed, sometimes unsigned) of accuracy.
+ * Because most C compilers use 32 bit integers, Xlib will not complain if you exceed the 16 bit limit, but your results will usually not be what you expected.
+ * You should be especially careful of this if you are implementing higher level scalable graphics packages."
+ *
+ * This function should be called before calling gdk_draw_line().
+ */
+void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
+{
+ if ( *x1 > 32768 || *x1 < -32767 )
+ clip_x ( x1, y1, x2, y2 );
+ if ( *y1 > 32768 || *y1 < -32767 )
+ clip_y ( x1, y1, x2, y2 );
+ if ( *x2 > 32768 || *x2 < -32767 )
+ clip_x ( x2, y2, x1, y1 );
+ if ( *y2 > 32768 || *y2 < -32767 )
+ clip_y ( x2, y2, x1, y1 );
+}
+
void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
{
if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
gint dest_x, gint dest_y, gint w, gint h )
{
gdk_draw_pixbuf ( vvp->scr_buffer,
-// GTK_WIDGET(vvp)->style->black_gc,
-NULL,
- pixbuf,
+ NULL,
+ pixbuf,
src_x, src_y, dest_x, dest_y, w, h,
GDK_RGB_DITHER_NONE, 0, 0 );
}
projects / andy / viking.git / blobdiff