aboutsummaryrefslogtreecommitdiff
path: root/src/ld-canvas.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/ld-canvas.c')
-rw-r--r--src/ld-canvas.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/src/ld-canvas.c b/src/ld-canvas.c
index 0667adb..259d7d1 100644
--- a/src/ld-canvas.c
+++ b/src/ld-canvas.c
@@ -36,6 +36,9 @@
/* Tolerance on all sides of symbols for strokes. */
#define SYMBOL_AREA_TOLERANCE 0.5
+/* The default screen resolution in DPI units. */
+#define DEFAULT_SCREEN_RESOLUTION 96
+
/*
* LdCanvasPrivate:
* @diagram: A diagram object assigned to this canvas as a model.
@@ -455,11 +458,16 @@ ld_canvas_get_library (LdCanvas *self)
static gdouble
ld_canvas_get_base_unit_in_px (GtkWidget *self)
{
+ gdouble resolution;
+
g_return_val_if_fail (GTK_IS_WIDGET (self), 1);
+ resolution = gdk_screen_get_resolution (gtk_widget_get_screen (self));
+ if (resolution == -1)
+ resolution = DEFAULT_SCREEN_RESOLUTION;
+
/* XXX: It might look better if the unit was rounded to a whole number. */
- return gdk_screen_get_resolution (gtk_widget_get_screen (self))
- / MM_PER_INCH * LD_CANVAS_BASE_UNIT_LENGTH;
+ return resolution / MM_PER_INCH * LD_CANVAS_BASE_UNIT_LENGTH;
}
/*