728 |
cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID); |
cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID); |
729 |
} |
} |
730 |
|
|
731 |
static float pixel2m(OsmGpsMap *map, int pixel) { |
static char * |
732 |
return pixel*osm_gps_map_get_scale(OSM_GPS_MAP(map)); |
dist_str_metric(int dist) |
733 |
|
{ |
734 |
|
if(dist<1000) |
735 |
|
return g_strdup_printf("%u m", dist); |
736 |
|
|
737 |
|
return g_strdup_printf("%u km", dist/1000); |
738 |
} |
} |
739 |
|
|
740 |
static void |
static void |
741 |
osd_render_scale(osm_gps_map_osd_t *osd) |
osd_render_scale(osm_gps_map_osd_t *osd) |
742 |
{ |
{ |
743 |
osd_priv_t *priv = (osd_priv_t*)osd->priv; |
osd_priv_t *priv = (osd_priv_t*)osd->priv; |
744 |
|
float m_per_pix = osm_gps_map_get_scale(OSM_GPS_MAP(osd->widget)); |
745 |
|
|
746 |
/* first fill with transparency */ |
/* first fill with transparency */ |
747 |
cairo_t *cr = cairo_create(priv->scale); |
cairo_t *cr = cairo_create(priv->scale); |
752 |
cairo_set_operator(cr, CAIRO_OPERATOR_OVER); |
cairo_set_operator(cr, CAIRO_OPERATOR_OVER); |
753 |
|
|
754 |
/* determine the size of the scale width in meters */ |
/* determine the size of the scale width in meters */ |
755 |
float width = pixel2m(OSM_GPS_MAP(osd->widget), OSD_SCALE_W); |
float width = (OSD_SCALE_W-2) * m_per_pix; |
756 |
printf("width = %f meters\n", width); |
printf("width = %f meters\n", width); |
757 |
|
|
758 |
/* scale this to useful values */ |
/* scale this to useful values */ |
760 |
int mant = width/pow(10,exp); |
int mant = width/pow(10,exp); |
761 |
printf("mant = %d, exp = %d \n", mant, exp); |
printf("mant = %d, exp = %d \n", mant, exp); |
762 |
|
|
763 |
|
int width_metric = mant * pow(10,exp); |
764 |
|
char *dist_str = dist_str_metric(width_metric); |
765 |
|
width_metric /= m_per_pix; |
766 |
|
printf("metric scale width = %d pixels: %s\n", width_metric, dist_str); |
767 |
|
|
768 |
|
int font_size = 12; |
769 |
|
|
770 |
|
cairo_select_font_face (cr, "Sans", |
771 |
|
CAIRO_FONT_SLANT_NORMAL, |
772 |
|
CAIRO_FONT_WEIGHT_BOLD); |
773 |
|
cairo_set_font_size (cr, font_size); |
774 |
|
cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0); |
775 |
|
|
776 |
|
cairo_text_extents_t extents; |
777 |
|
cairo_text_extents (cr, dist_str, &extents); |
778 |
|
|
779 |
|
cairo_move_to (cr, font_size/3, font_size); |
780 |
|
cairo_show_text (cr, dist_str); |
781 |
|
|
782 |
|
printf("height = %f, bearing = %f\n", extents.height, extents.y_bearing); |
783 |
|
|
784 |
|
/* draw white line */ |
785 |
|
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); |
786 |
|
cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0); |
787 |
|
cairo_set_line_width (cr, 3); |
788 |
|
cairo_move_to (cr, 2, 2*font_size/3); |
789 |
|
cairo_rel_line_to (cr, 0, 2*font_size/3); |
790 |
|
cairo_rel_line_to (cr, width_metric, 0); |
791 |
|
cairo_rel_line_to (cr, 0, -2*font_size/3); |
792 |
|
cairo_stroke(cr); |
793 |
|
|
794 |
|
/* draw black line */ |
795 |
|
cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0); |
796 |
|
cairo_set_line_width (cr, 2); |
797 |
|
cairo_move_to (cr, 2, 2*font_size/3); |
798 |
|
cairo_rel_line_to (cr, 0, 2*font_size/3); |
799 |
|
cairo_rel_line_to (cr, width_metric, 0); |
800 |
|
cairo_rel_line_to (cr, 0, -2*font_size/3); |
801 |
|
cairo_stroke(cr); |
802 |
|
|
803 |
|
/* xyz */ |
804 |
|
|
805 |
cairo_destroy(cr); |
cairo_destroy(cr); |
806 |
} |
} |
807 |
|
|
920 |
#ifdef OSD_SCALE |
#ifdef OSD_SCALE |
921 |
priv->scale = |
priv->scale = |
922 |
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, |
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, |
923 |
OSD_SCALE_W, OSD_SCALE_H); |
OSD_SCALE_W+2, OSD_SCALE_H+2); |
924 |
#endif |
#endif |
925 |
|
|
926 |
/* ... and render it */ |
/* ... and render it */ |