[gimp] app: make the coordinates display in the curve view configurable

[Michael Natterer <mitch src gnome org>]

commit 088368079c4cf754c8c32cf67d01194be7cd6dcb
Author: Michael Natterer <mitch gimp org>
Date:   Tue Feb 23 11:39:35 2010 +0100

    app: make the coordinates display in the curve view configurable
    
    Add API for X and Y ranges, default to 0.0..1.0 and configure the view
    for 0..255 in the curves tool.

 app/tools/gimpcurvestool.c  |    2 +
 app/widgets/gimpcurveview.c |   67 +++++++++++++++++++++++++++++++++++++++---
 app/widgets/gimpcurveview.h |   11 +++++++
 3 files changed, 75 insertions(+), 5 deletions(-)
---
diff --git a/app/tools/gimpcurvestool.c b/app/tools/gimpcurvestool.c
index 6d3c632..a455a9d 100644
--- a/app/tools/gimpcurvestool.c
+++ b/app/tools/gimpcurvestool.c
@@ -521,6 +521,8 @@ gimp_curves_tool_dialog (GimpImageMapTool *image_map_tool)
   gtk_widget_show (frame);
 
   tool->graph = gimp_curve_view_new ();
+  gimp_curve_view_set_range_x (GIMP_CURVE_VIEW (tool->graph), 0, 255);
+  gimp_curve_view_set_range_y (GIMP_CURVE_VIEW (tool->graph), 0, 255);
   gtk_widget_set_size_request (tool->graph,
                                GRAPH_SIZE + RADIUS * 2,
                                GRAPH_SIZE + RADIUS * 2);
diff --git a/app/widgets/gimpcurveview.c b/app/widgets/gimpcurveview.c
index dcade68..97706c3 100644
--- a/app/widgets/gimpcurveview.c
+++ b/app/widgets/gimpcurveview.c
@@ -202,6 +202,10 @@ gimp_curve_view_init (GimpCurveView *view)
   view->xpos        = -1.0;
   view->cursor_x    = -1.0;
   view->cursor_y    = -1.0;
+  view->range_x_min = 0.0;
+  view->range_x_max = 1.0;
+  view->range_y_min = 0.0;
+  view->range_y_max = 1.0;
 
   gtk_widget_set_can_focus (GTK_WIDGET (view), TRUE);
   gtk_widget_add_events (GTK_WIDGET (view),
@@ -605,8 +609,19 @@ gimp_curve_view_expose (GtkWidget      *widget,
 
       if (! view->cursor_layout)
         {
-          view->cursor_layout = gtk_widget_create_pango_layout (widget,
-                                                                "x:888 y:888");
+          /*  stupid heuristic: special-case for 0..255  */
+          if (view->range_x_max == 255.0 &&
+              view->range_y_max == 255.0)
+            {
+              view->cursor_layout =
+                gtk_widget_create_pango_layout (widget, "x:888 y:888");
+            }
+          else
+            {
+              view->cursor_layout =
+                gtk_widget_create_pango_layout (widget, "x:0.888 y:0.888");
+            }
+
           pango_layout_get_pixel_extents (view->cursor_layout,
                                           NULL, &view->cursor_rect);
         }
@@ -626,9 +641,29 @@ gimp_curve_view_expose (GtkWidget      *widget,
       cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
       cairo_stroke (cr);
 
-      g_snprintf (buf, sizeof (buf), "x:%3d y:%3d",
-                  (gint) (view->cursor_x         * 255.999),
-                  (gint) ((1.0 - view->cursor_y) * 255.999));
+      /*  stupid heuristic: special-case for 0..255  */
+      if (view->range_x_max == 255.0 &&
+          view->range_y_max == 255.0)
+        {
+          g_snprintf (buf, sizeof (buf), "x:%3d y:%3d",
+                      (gint) (view->cursor_x *
+                              (view->range_x_max - view->range_x_min) +
+                              view->range_x_min),
+                      (gint) ((1.0 - view->cursor_y) *
+                              (view->range_y_max - view->range_y_min) +
+                              view->range_y_min));
+        }
+      else
+        {
+          g_snprintf (buf, sizeof (buf), "x:%0.3f y:%0.3f",
+                      view->cursor_x *
+                      (view->range_x_max - view->range_x_min) +
+                      view->range_x_min,
+                      (1.0 - view->cursor_y) *
+                      (view->range_y_max - view->range_y_min) +
+                      view->range_y_min);
+        }
+
       pango_layout_set_text (view->cursor_layout, buf, -1);
 
       gdk_cairo_set_source_color (cr, &style->base[GTK_STATE_NORMAL]);
@@ -1165,6 +1200,28 @@ gimp_curve_view_set_selected (GimpCurveView *view,
 }
 
 void
+gimp_curve_view_set_range_x (GimpCurveView *view,
+                             gdouble        min,
+                             gdouble        max)
+{
+  g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+
+  view->range_x_min = min;
+  view->range_x_max = max;
+}
+
+void
+gimp_curve_view_set_range_y (GimpCurveView *view,
+                             gdouble        min,
+                             gdouble        max)
+{
+  g_return_if_fail (GIMP_IS_CURVE_VIEW (view));
+
+  view->range_y_min = min;
+  view->range_y_max = max;
+}
+
+void
 gimp_curve_view_set_xpos (GimpCurveView *view,
                           gdouble        x)
 {
diff --git a/app/widgets/gimpcurveview.h b/app/widgets/gimpcurveview.h
index b313d53..1fe6a4a 100644
--- a/app/widgets/gimpcurveview.h
+++ b/app/widgets/gimpcurveview.h
@@ -58,6 +58,11 @@ struct _GimpCurveView
   gdouble            xpos;
   PangoLayout       *xpos_layout;
 
+  gdouble            range_x_min;
+  gdouble            range_x_max;
+  gdouble            range_y_min;
+  gdouble            range_y_max;
+
   gdouble            cursor_x;
   gdouble            cursor_y;
   PangoLayout       *cursor_layout;
@@ -90,6 +95,12 @@ void        gimp_curve_view_remove_background (GimpCurveView *view,
 
 void        gimp_curve_view_set_selected      (GimpCurveView *view,
                                                gint           selected);
+void        gimp_curve_view_set_range_x       (GimpCurveView *view,
+                                               gdouble        min,
+                                               gdouble        max);
+void        gimp_curve_view_set_range_y       (GimpCurveView *view,
+                                               gdouble        min,
+                                               gdouble        max);
 void        gimp_curve_view_set_xpos          (GimpCurveView *view,
                                                gdouble        x);