[gtk+/wip/baedert/gtkimageview: 1666/1672] Last "working" state
- From: Timm Bäder <baedert src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/wip/baedert/gtkimageview: 1666/1672] Last "working" state
- Date: Thu, 10 Dec 2015 16:26:01 +0000 (UTC)
commit afd2a3843923d9a432fad102cdbb2c5a26d96479
Author: Timm Bäder <mail baedert org>
Date: Sat Dec 5 15:15:52 2015 +0100
Last "working" state
demos/gtk-demo/image_view.ui | 16 -----
gtk/gtkimageview.c | 145 ++++++++++++++++++++++++++++-------------
2 files changed, 99 insertions(+), 62 deletions(-)
---
diff --git a/demos/gtk-demo/image_view.ui b/demos/gtk-demo/image_view.ui
index 176ce69..a0ee884 100644
--- a/demos/gtk-demo/image_view.ui
+++ b/demos/gtk-demo/image_view.ui
@@ -151,22 +151,6 @@
</packing>
</child>
-
-
-
- <child>
- <object class="GtkCheckButton">
- <property name="visible">true</property>
- <property name="label" translatable="yes">Draw on Surface</property>
- </object>
- <packing>
- <property name="left_attach">0</property>
- <property name="top_attach">8</property>
- <property name="width">2</property>
- </packing>
- </child>
-
-
<child>
<object class="GtkLabel">
<property name="visible">true</property>
diff --git a/gtk/gtkimageview.c b/gtk/gtkimageview.c
index a4fac89..8c6782c 100644
--- a/gtk/gtkimageview.c
+++ b/gtk/gtkimageview.c
@@ -192,9 +192,9 @@ bounding_box_for_angle (GtkImageView *image_view,
double upper_right_x, upper_right_y;
double upper_left_x, upper_left_y;
double scale;
- static double cached_width;
- static double cached_height;
- static double cached_scale;
+ /*static double cached_width;*/
+ /*static double cached_height;*/
+ /*static double cached_scale;*/
/*if (priv->size_valid)*/
/*{*/
@@ -263,22 +263,19 @@ bounding_box_for_angle (GtkImageView *image_view,
g_object_notify_by_pspec (G_OBJECT (image_view),
widget_props[PROP_SCALE]);
- *width = cached_width = bb_width * scale;
- *height = cached_height = bb_height * scale;
- }
- else
- {
- // XXX These 2 branches do the same?
- g_message ("bb_width: %d, scale: %f", bb_width, scale);
- *width = cached_width = bb_width * scale;
- *height = cached_height = bb_height * scale;
}
+ *width = bb_width * scale;
+ *height = bb_height * scale;
/*priv->size_valid = TRUE;*/
}
+ /* XXX What if the image is rotated by 45deg and the user presses outside of it?
+ * I.e. the anchor point would lie outside of the image? */
+
+
static void
gtk_image_view_fix_point_rotate (GtkImageView *image_view,
double angle_before,
@@ -287,17 +284,18 @@ gtk_image_view_fix_point_rotate (GtkImageView *image_view,
State *old_state)
{
GtkImageViewPrivate *priv = gtk_image_view_get_instance_private (image_view);
- double new_angle = priv->angle;
+ /*double new_angle = priv->angle;*/
int bb_width;
int bb_height;
double center_x;
double center_y;
- double value_x;
- double value_y;
+ /*double value_x;*/
+ /*double value_y;*/
g_assert (priv->anchor_x != -1 &&
priv->anchor_y != -1);
+
double center_x_before;
double center_y_before;
@@ -310,20 +308,44 @@ gtk_image_view_fix_point_rotate (GtkImageView *image_view,
&bb_height,
NULL);
- center_x_before = bb_width / 2.0;
+ center_x_before = bb_width / 2.0;
center_y_before = bb_height / 2.0;
center_x_before -= old_state->hvalue;
center_y_before -= old_state->vvalue;
+ center_x_before += anchor_x;
+ center_y_before += anchor_y;
+
bounding_box_for_angle (image_view,
- /*angle_before,*/
priv->angle,
&bb_width,
&bb_height,
NULL);
+ /*
+ * XXX The anchor point changes when the angle changes...
+ */
+
+
+ /* Once we get here, we assume the adjustments are already updated. */
+ g_assert (gtk_adjustment_get_upper (priv->hadjustment) == bb_width);
+ g_assert (gtk_adjustment_get_upper (priv->vadjustment) == bb_height);
+
+
+ /*
+ * We know that the given anchor_x/anchor_y are relatieve to the
+ * old_state.
+ * So, the new task is to compute where the position of anchor_x/anchor_y
+ * are now that we changed priv->angle!
+ *
+ * After this, we need to update the current anchor point!
+ * But only because it's relative to the center...
+ */
+
+
+
/*g_message ("bounding box: %d/%d", bb_width, bb_height);*/
center_x = bb_width / 2.0;
center_y = bb_height / 2.0;
@@ -335,6 +357,9 @@ gtk_image_view_fix_point_rotate (GtkImageView *image_view,
center_x -= gtk_adjustment_get_value (priv->hadjustment);
center_y -= gtk_adjustment_get_value (priv->vadjustment);
+ center_x += anchor_x;
+ center_y += anchor_y;
+
/*double c = center_x;*/
/*g_message ("%f, %f, %f, %f", a, b, c, gtk_adjustment_get_value (priv->hadjustment));*/
@@ -352,20 +377,11 @@ gtk_image_view_fix_point_rotate (GtkImageView *image_view,
* pixel-position AFTER the angle got changed. Then take the difference
* and change the value.
*
- * 3) The position might change and NOT depend on the anchor point at all
- * -- e.g. if the anchor point is at the center of the image. A change in
- * bounding box size will then move the image down.
- *
- *
*/
- /* XXX What if the image is rotated by 45deg and the user presses outside of it?
- * I.e. the anchor point would lie outside of the image? */
-
g_message ("Anchor: %f/%f", priv->anchor_x, priv->anchor_y);
g_message ("Center before: %f/%f", center_x_before, center_y_before);
- g_message ("Center: %f/%f", center_x, center_y);
- /*g_message ("delta_x = (%d + %f) - %f", anchor_y, value_x, center_x);*/
+ g_message ("Center: %f/%f (This can be off)", center_x, center_y);
// TODO: Fix the calculations for non-center points,
@@ -1061,8 +1077,10 @@ gtk_image_view_draw (GtkWidget *widget, cairo_t *ct)
/* XXX Debugging, Remove later. */
if (priv->anchor_x != -1 && priv->anchor_y != -1)
{
- double x = priv->anchor_x;
- double y = priv->anchor_y;
+ double w = gtk_adjustment_get_upper (priv->hadjustment);
+ double h = gtk_adjustment_get_upper (priv->vadjustment);
+ double x = (w / 2.0) + priv->anchor_x - gtk_adjustment_get_value (priv->hadjustment);
+ double y = (h / 2.0) + priv->anchor_y - gtk_adjustment_get_value (priv->vadjustment);
cairo_set_source_rgba (ct, 0, 1, 0, 1);
cairo_rectangle (ct, x - 2, y - 2, 4, 4);
@@ -1217,6 +1235,7 @@ gtk_image_view_set_scale (GtkImageView *image_view,
old_scale = priv->scale;
+ // XXX This should probably center relative to the bounding box, not the widget size.
pointer_x = gtk_widget_get_allocated_width (GTK_WIDGET (image_view)) / 2;
pointer_y = gtk_widget_get_allocated_height (GTK_WIDGET (image_view)) / 2;
@@ -1248,10 +1267,11 @@ gtk_image_view_get_scale (GtkImageView *image_view)
/**
* gtk_image_view_set_angle:
- * @image_view:
+ * @image_view: A #GtkImageView
* @angle: The angle to rotate the image about, in
* degrees. If this is < 0 or > 360, the value wil
- * be wrapped.
+ * be wrapped. So e.g. setting this to 362 will result in a
+ * angle of 2, setting it to -2 will result in 358.
*/
void
gtk_image_view_set_angle (GtkImageView *image_view,
@@ -1269,6 +1289,7 @@ gtk_image_view_set_angle (GtkImageView *image_view,
else if (angle < 0.0)
angle = 360.0 + (int)(angle / 360.0);
+ // XXX 360.0 and 0.0 are the same thing, but both possible...
g_assert (angle >= 0.0);
g_assert (angle <= 360.0);
@@ -1282,6 +1303,36 @@ gtk_image_view_set_angle (GtkImageView *image_view,
+
+ {
+ // These are in widget coordinates now.
+ double ax = gtk_widget_get_allocated_width (GTK_WIDGET (image_view)) / 2.0 + 5.0;
+ double ay = gtk_widget_get_allocated_height (GTK_WIDGET (image_view)) / 2.0 + 5.0;
+
+ // Calculate the difference between the current surface center
+ // and the current widget center + 5
+
+ // we aleady called _update_adjustments, so the 2 uppers are fine to use.
+ double cx = gtk_adjustment_get_upper (priv->hadjustment) / 2.0 -
+ gtk_adjustment_get_value (priv->hadjustment);
+ double cy = gtk_adjustment_get_upper (priv->vadjustment) / 2.0 -
+ gtk_adjustment_get_value (priv->vadjustment);
+
+ // cx/cy now contain the bounding box center in widget coordinates.
+
+ g_message ("cx: %f", cx);
+ g_message ("cy: %f", cy);
+ g_message ("ax: %f", ax);
+ g_message ("ay: %f", ay);
+
+ // Now store the difference between cx/cy and ax/ay in anchor_x/anchor_y
+ priv->anchor_x = ax - cx;
+ priv->anchor_y = ay - cy;
+
+ }
+
+
+
/*if (priv->snap_angle)*/
/*gtk_image_view_do_snapping (image_view, angle);*/
/*else*/
@@ -1302,21 +1353,23 @@ gtk_image_view_set_angle (GtkImageView *image_view,
/* XXX DEBUG */
/*if (priv->hadjustment && priv->vadjustment)*/
/*{*/
- static gboolean first = TRUE;
+ /*static gboolean first = TRUE;*/
- if (first)
- {
- priv->gesture_start_scale = angle_before;
- first = FALSE;
- }
+ /*if (first)*/
+ /*{*/
+ /*priv->gesture_start_scale = angle_before;*/
+ /*first = FALSE;*/
+ /*}*/
/*priv->anchor_x = 200 + (gtk_widget_get_allocated_width (GTK_WIDGET (image_view))) / 2 - 200;*/
/*priv->anchor_y = 200 + (gtk_widget_get_allocated_height (GTK_WIDGET (image_view))) / 2 - 200;*/
+ // XXX Later, we can just set the anchor_point to 0/0 here and calculate the
+ // center-relative anchor point in the gesture_begin handlers
+
- priv->anchor_x = 5;
- priv->anchor_y = 5;
+ /*priv->anchor_x = priv->anchor_y = 5;*/
gtk_image_view_fix_point_rotate (image_view,
angle_before,
@@ -1802,7 +1855,7 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
* GtkImageView:scale:
* The scale the internal surface gets drawn with.
*
- * Since: 3.18
+ * Since: 3.20
*/
widget_props[PROP_SCALE] = g_param_spec_double ("scale",
P_("Scale"),
@@ -1818,7 +1871,7 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
* e.g. when fit-allocation is true, which will change the scale depeding on the
* widget allocation.
*
- * Since: 3.18
+ * Since: 3.20
*/
widget_props[PROP_SCALE_SET] = g_param_spec_boolean ("scale-set",
P_(""),
@@ -1831,7 +1884,7 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
* This is in degrees and we rotate in the mathematically negative direction,
* i.e. clock wise.
*
- * Since: 3.18
+ * Since: 3.20
*/
widget_props[PROP_ANGLE] = g_param_spec_double ("angle",
P_("angle"),
@@ -1844,7 +1897,7 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
* GtkImageView:rotate-gesture-enabled:
* Whether or not the image can be rotated using a two-finger rotate gesture.
*
- * Since: 3.18
+ * Since: 3.20
*/
widget_props[PROP_ROTATE_GESTURE_ENABLED] = g_param_spec_boolean ("rotate-gesture-enabled",
P_("Foo"),
@@ -1855,7 +1908,7 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
* GtkImageView:zoom-gesture-enabled:
* Whether or not image can be scaled using a two-finger zoom gesture or not.
*
- * Since: 3.18
+ * Since: 3.20
*/
widget_props[PROP_ZOOM_GESTURE_ENABLED] = g_param_spec_boolean ("zoom-gesture-enabled",
P_("Foo"),
@@ -1869,7 +1922,7 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
* set to the closest 90° step that is lower than the given angle.
* Changing the angle from one 90° step to another will be transitioned
*
- * Since: 3.18
+ * Since: 3.20
*/
widget_props[PROP_SNAP_ANGLE] = g_param_spec_boolean ("snap-angle",
P_("Foo"),
@@ -1883,7 +1936,7 @@ gtk_image_view_class_init (GtkImageViewClass *view_class)
* widget allocation. The image will be scaled down to fit into the widget allocation,
* but never scaled up.
*
- * Since: 3.18
+ * Since: 3.20
*/
widget_props[PROP_FIT_ALLOCATION] = g_param_spec_boolean ("fit-allocation",
P_("Foo"),
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