void zoom_update(Ihandle* ih, double zoom_index)
{
Ihandle* zoom_lbl = IupGetDialogChild(ih, "ZOOMLABEL");
Ihandle* canvas = IupGetDialogChild(ih, "CANVAS");
imImage* image = (imImage*)IupGetAttribute(canvas, "IMAGE");
double zoom_factor = pow(2, zoom_index);
IupSetStrf(zoom_lbl, "TITLE", "%.0f%%", floor(zoom_factor * 100));
if (image)
{
float old_center_x, old_center_y;
int view_width = (int)(zoom_factor * image->width);
int view_height = (int)(zoom_factor * image->height);
scroll_calc_center(canvas, &old_center_x, &old_center_y);
scrollbar_update(canvas, view_width, view_height);
scroll_center(canvas, old_center_x, old_center_y);
}
IupUpdate(canvas);
}
int canvas_resize_cb(Ihandle* canvas)
{
imImage* image = (imImage*)IupGetAttribute(canvas, "IMAGE");
if (image)
{
Ihandle* zoom_val = IupGetDialogChild(canvas, "ZOOMVAL");
double zoom_index = IupGetDouble(zoom_val, "VALUE");
double zoom_factor = pow(2, zoom_index);
float old_center_x, old_center_y;
int view_width = (int)(zoom_factor * image->width);
int view_height = (int)(zoom_factor * image->height);
scroll_calc_center(canvas, &old_center_x, &old_center_y);
scrollbar_update(canvas, view_width, view_height);
scroll_center(canvas, old_center_x, old_center_y);
}
return IUP_DEFAULT;
}
static void scroll_view_center(int argc, const char ** argv)
{
scroll_center(PLYR.x, PLYR.y);
zone_draw(PLYR.z);
}
