From 4afb308180c136f8135385ee7c05dd6c7ee326c5 Mon Sep 17 00:00:00 2001
From: neoraider <devnull@localhost>
Date: Fri, 16 Nov 2007 17:49:00 +0000
Subject: zoomedit: Fixed some scrolling bugs.

---
 Drawer.cpp | 34 +++++++++++++++++-----------------
 Drawer.h   |  2 +-
 2 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/Drawer.cpp b/Drawer.cpp
index e3fe6e6..e1373a5 100644
--- a/Drawer.cpp
+++ b/Drawer.cpp
@@ -93,21 +93,23 @@ void Drawer::updateViewport() {
 }
 
 void Drawer::updateScrolling() {
-  if(getImageWidth()*scale < getWidth())
+  if((getImageWidth())*scale < getWidth())
     xCenter = 0;
   else
     xCenter = gtk_adjustment_get_value(hAdjustment);
   
-  if(getImageHeight()*scale < getHeight())
+  if((getImageHeight())*scale < getHeight())
     yCenter = 0;
   else 
     yCenter = gtk_adjustment_get_value(vAdjustment);
   
-  update();
+  gtk_widget_queue_draw(drawingArea);
 }
 
 void Drawer::updateScrollbars(float x, float y) {
   const gdouble imageWidth = getImageWidth(), imageHeight = getImageHeight();
+  const gdouble minX = -imageWidth/2, maxX = imageWidth/2;
+  const gdouble minY = -imageHeight/2, maxY = imageHeight/2;
   const gdouble width = getWidth()/scale, height = getHeight()/scale;
   gdouble lower, upper, pageSize, value;
   
@@ -115,24 +117,24 @@ void Drawer::updateScrollbars(float x, float y) {
   gdk_window_freeze_updates(drawingArea->window);
   
   g_object_get(G_OBJECT(hAdjustment), "lower", &lower, "upper", &upper, "page_size", &pageSize, NULL);
-  g_object_set(G_OBJECT(hAdjustment), "lower", (-imageWidth+width)/2, "upper", (imageWidth+width)/2, "page_size", width, NULL);
+  g_object_set(G_OBJECT(hAdjustment), "lower", minX + width/2, "upper", maxX + width/2, "page_size", width, NULL);
   gtk_adjustment_changed(hAdjustment);
   
-  if((pageSize > (upper-lower) && width < imageWidth) || upper == lower)
+  if(pageSize > (upper-lower) && width < imageWidth)
     value = 0;
   else
     value = gtk_adjustment_get_value(hAdjustment) + (x-0.5)*pageSize*(pageSize/width-1);
-  gtk_adjustment_set_value(hAdjustment, MAX(MIN(value, imageWidth/2), -imageWidth/2));
+  gtk_adjustment_set_value(hAdjustment, MAX(MIN(value, maxX - width/2), minX + width/2));
   
   g_object_get(G_OBJECT(vAdjustment), "lower", &lower, "upper", &upper, "page_size", &pageSize, NULL);
-  g_object_set(G_OBJECT(vAdjustment), "lower", (-imageHeight+height)/2, "upper", (imageHeight+height)/2, "page_size", height, NULL);
+  g_object_set(G_OBJECT(vAdjustment), "lower", minY + height/2, "upper", maxY + height/2, "page_size", height, NULL);
   gtk_adjustment_changed(vAdjustment);
   
-  if((pageSize > upper && height < imageHeight) || upper == lower)
+  if(pageSize > (upper-lower) && height < imageHeight)
     value = 0;
   else
     value = gtk_adjustment_get_value(vAdjustment) + (y-0.5)*pageSize*(pageSize/height-1);
-  gtk_adjustment_set_value(vAdjustment, MAX(MIN(value, imageHeight/2), -imageHeight/2));
+  gtk_adjustment_set_value(vAdjustment, MAX(MIN(value, maxY - height/2), minY + height/2));
   
   gdk_window_thaw_updates(drawingArea->window);
   
@@ -234,27 +236,25 @@ void Drawer::viewToImage(Vertex *v) const {
 }
 
 float Drawer::getImageWidth() const {
-  float min = 0, max = 0;
+  float max = 0;
   
   for(Level::iterator room = window->getLevel().begin(); room != window->getLevel().end(); room++) {
     for(Room::iterator v = room->begin(); v != room->end(); v++) {
-      min = fminf(min, v->getX());
-      max = fmaxf(max, v->getX());
+      max = fmaxf(max, fabsf(v->getX()));
     }
   }
   
-  return (max-min+10);
+  return (2*max+1);
 }
 
 float Drawer::getImageHeight() const {
-  float min = 0, max = 0;
+  float max = 0;
   
   for(Level::iterator room = window->getLevel().begin(); room != window->getLevel().end(); room++) {
     for(Room::iterator v = room->begin(); v != room->end(); v++) {
-      min = fminf(min, v->getY());
-      max = fmaxf(max, v->getY());
+      max = fmaxf(max, fabsf(v->getY()));
     }
   }
   
-  return (max-min+10);
+  return (2*max+1);
 }
diff --git a/Drawer.h b/Drawer.h
index 236c72a..b471f1f 100644
--- a/Drawer.h
+++ b/Drawer.h
@@ -76,7 +76,7 @@ class Drawer {
     }
     
     void update() {
-      gtk_widget_queue_draw(drawingArea);
+      updateScrollbars();
     }
 };
 
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