/**
* gimp_display_shell_scale_to:
* @shell:
* @scale:
* @viewport_x:
* @viewport_y:
*
* Zooms. The display offsets are adjusted so that the point specified
* by @x and @y doesn't change it's position on screen.
**/
static void
gimp_display_shell_scale_to (GimpDisplayShell *shell,
gdouble scale,
gint viewport_x,
gint viewport_y)
{
gdouble scale_x, scale_y;
gdouble image_focus_x, image_focus_y;
gint target_offset_x, target_offset_y;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! shell->display)
return;
gimp_display_shell_untransform_xy_f (shell,
viewport_x,
viewport_y,
&image_focus_x,
&image_focus_y);
gimp_display_shell_calculate_scale_x_and_y (shell, scale, &scale_x, &scale_y);
target_offset_x = scale_x * image_focus_x - viewport_x;
target_offset_y = scale_y * image_focus_y - viewport_y;
/* Note that we never come here if we need to
* resize_windows_on_zoom
*/
gimp_display_shell_scale_by_values (shell,
scale,
target_offset_x,
target_offset_y,
FALSE);
}
/**
* gimp_display_shell_scale_to:
* @shell:
* @scale:
* @viewport_x:
* @viewport_y:
*
* Zooms. The display offsets are adjusted so that the point specified
* by @x and @y doesn't change it's position on screen.
**/
static void
gimp_display_shell_scale_to (GimpDisplayShell *shell,
gdouble scale,
gdouble viewport_x,
gdouble viewport_y)
{
gdouble image_x, image_y;
gdouble new_viewport_x, new_viewport_y;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! shell->display)
return;
/* freeze the active tool */
gimp_display_shell_pause (shell);
gimp_display_shell_untransform_xy_f (shell,
viewport_x,
viewport_y,
&image_x,
&image_y);
/* Note that we never come here if we need to resize_windows_on_zoom
*/
gimp_display_shell_scale_by_values (shell,
scale,
shell->offset_x,
shell->offset_y,
FALSE);
gimp_display_shell_transform_xy_f (shell,
image_x,
image_y,
&new_viewport_x,
&new_viewport_y);
gimp_display_shell_scroll (shell,
new_viewport_x - viewport_x,
new_viewport_y - viewport_y);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
/**
* gimp_display_shell_scale_revert:
* @shell: the #GimpDisplayShell
*
* Reverts the display to the previously used scale. If no previous
* scale exist, then the call does nothing.
*
* Return value: %TRUE if the scale was reverted, otherwise %FALSE.
**/
gboolean
gimp_display_shell_scale_revert (GimpDisplayShell *shell)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), FALSE);
/* don't bother if no scale has been set */
if (shell->last_scale < SCALE_EPSILON)
return FALSE;
shell->last_scale_time = 0;
gimp_display_shell_scale_by_values (shell,
shell->last_scale,
shell->last_offset_x,
shell->last_offset_y,
FALSE); /* don't resize the window */
return TRUE;
}
/**
* gimp_display_shell_scale_to_rectangle:
* @shell: the #GimpDisplayShell
* @zoom_type: whether to zoom in or out
* @x: retangle's x in image coordinates
* @y: retangle's y in image coordinates
* @width: retangle's width in image coordinates
* @height: retangle's height in image coordinates
* @resize_window: whether the display window should be resized
*
* Scales and scrolls to a specific image rectangle
**/
void
gimp_display_shell_scale_to_rectangle (GimpDisplayShell *shell,
GimpZoomType zoom_type,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
gboolean resize_window)
{
GimpImage *image;
gdouble current_scale;
gdouble new_scale;
gdouble display_width;
gdouble display_height;
gdouble factor = 1.0;
gint offset_x = 0;
gint offset_y = 0;
gdouble xres;
gdouble yres;
gdouble screen_xres;
gdouble screen_yres;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
width = MAX (1.0, width);
height = MAX (1.0, height);
current_scale = gimp_zoom_model_get_factor (shell->zoom);
display_width = FUNSCALEX (shell, shell->disp_width);
display_height = FUNSCALEY (shell, shell->disp_height);
switch (zoom_type)
{
case GIMP_ZOOM_IN:
factor = MIN ((display_width / width),
(display_height / height));
break;
case GIMP_ZOOM_OUT:
factor = MAX ((width / display_width),
(height / display_height));
break;
default:
g_return_if_reached ();
break;
}
new_scale = current_scale * factor;
gimp_image_get_resolution (image, &xres, &yres);
gimp_display_shell_scale_get_screen_resolution (shell,
&screen_xres, &screen_yres);
switch (zoom_type)
{
case GIMP_ZOOM_IN:
/* move the center of the rectangle to the center of the
* viewport:
*
* new_offset = center of rectangle in new scale screen coords
* including offset
* -
* center of viewport in screen coords without
* offset
*/
offset_x = RINT (new_scale * (x + width / 2.0) *
screen_xres / xres -
(shell->disp_width / 2.0));
offset_y = RINT (new_scale * (y + height / 2.0) *
screen_yres / yres -
(shell->disp_height / 2.0));
break;
case GIMP_ZOOM_OUT:
/* move the center of the viewport to the center of the
* rectangle:
*
* new_offset = center of viewport in new scale screen coords
* including offset
* -
* center of rectangle in screen coords without
* offset
*/
offset_x = RINT (new_scale * UNSCALEX (shell,
shell->offset_x +
shell->disp_width / 2.0) *
screen_xres / xres -
(SCALEX (shell, x + width / 2.0) -
shell->offset_x));
offset_y = RINT (new_scale * UNSCALEY (shell,
shell->offset_y +
shell->disp_height / 2.0) *
screen_yres / yres -
(SCALEY (shell, y + height / 2.0) -
shell->offset_y));
break;
default:
break;
}
if (new_scale != current_scale ||
offset_x != shell->offset_x ||
offset_y != shell->offset_y)
{
gimp_display_shell_scale_by_values (shell,
new_scale,
offset_x, offset_y,
resize_window);
}
}
/**
* gimp_display_shell_scale_to_rectangle:
* @shell: the #GimpDisplayShell
* @zoom_type: whether to zoom in or out
* @x: retangle's x in image coordinates
* @y: retangle's y in image coordinates
* @width: retangle's width in image coordinates
* @height: retangle's height in image coordinates
* @resize_window: whether the display window should be resized
*
* Scales and scrolls to a specific image rectangle
**/
void
gimp_display_shell_scale_to_rectangle (GimpDisplayShell *shell,
GimpZoomType zoom_type,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
gboolean resize_window)
{
gdouble current_scale;
gdouble new_scale;
gdouble factor = 1.0;
gint offset_x = 0;
gint offset_y = 0;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
gimp_display_shell_transform_bounds (shell,
x, y,
x + width, y + height,
&x, &y,
&width, &height);
/* Convert scrolled (x1, y1, x2, y2) to unscrolled (x, y, width, height). */
width -= x;
height -= y;
x += shell->offset_x;
y += shell->offset_y;
width = MAX (1.0, width);
height = MAX (1.0, height);
current_scale = gimp_zoom_model_get_factor (shell->zoom);
switch (zoom_type)
{
case GIMP_ZOOM_IN:
factor = MIN ((shell->disp_width / width),
(shell->disp_height / height));
break;
case GIMP_ZOOM_OUT:
factor = MAX ((width / shell->disp_width),
(height / shell->disp_height));
break;
default:
g_return_if_reached ();
break;
}
new_scale = current_scale * factor;
switch (zoom_type)
{
case GIMP_ZOOM_IN:
/* move the center of the rectangle to the center of the
* viewport:
*
* new_offset = center of rectangle in new scale screen coords
* including offset
* -
* center of viewport in screen coords without
* offset
*/
offset_x = RINT (factor * (x + width / 2.0) - (shell->disp_width / 2));
offset_y = RINT (factor * (y + height / 2.0) - (shell->disp_height / 2));
break;
case GIMP_ZOOM_OUT:
/* move the center of the viewport to the center of the
* rectangle:
*
* new_offset = center of viewport in new scale screen coords
* including offset
* -
* center of rectangle in screen coords without
* offset
*/
offset_x = RINT (factor * (shell->offset_x + shell->disp_width / 2) -
((x + width / 2.0) - shell->offset_x));
offset_y = RINT (factor * (shell->offset_y + shell->disp_height / 2) -
((y + height / 2.0) - shell->offset_y));
break;
default:
break;
}
if (new_scale != current_scale ||
offset_x != shell->offset_x ||
offset_y != shell->offset_y)
{
gimp_display_shell_scale_by_values (shell,
new_scale,
offset_x, offset_y,
resize_window);
}
}
