diff --git a/lib/settings.cpp b/lib/settings.cpp
index 7a461b1..10b8874 100644
--- a/lib/settings.cpp
+++ b/lib/settings.cpp
@@ -2,5 +2,6 @@
 
 Settings::Settings( void )
 {
-
+	colorThreshold[0] = 100;
+	colorThreshold[1] = 1000;
 }
diff --git a/lib/settings.h b/lib/settings.h
index 660f5e0..e97b170 100644
--- a/lib/settings.h
+++ b/lib/settings.h
@@ -17,12 +17,20 @@ class Settings
 
 	public:
 		Settings( void );
-		point getUL( void );
-		point getUR( void );
-		point getBL( void );
-		point getBR( void );
-		int getWhiteTreshold( void );
-		int getBlackTreshold( void );
+		point getUL( void ) { return ul; }
+		point getUR( void ) { return ur; }
+		point getBL( void ) { return bl; }
+		point getBR( void ) { return br; }
+		void setUL( point p ) { ul = p; }
+		void setUR( point p ) { ur = p; }
+		void setBL( point p ) { bl = p; }
+		void setBR( point p ) { br = p; }
+
+		int getWhiteTreshold( void ) { return colorThreshold[WHITE]; }
+		int getBlackTreshold( void ) { return colorThreshold[BLACK]; }
+
+		void setWhiteThreshold( int t) { colorThreshold[WHITE] = t; }
+		void setBlackThreshold( int t) { colorThreshold[BLACK] = t; }
 
 	private:
 		//upper left, upper right etc...
diff --git a/lib/state.cpp b/lib/state.cpp
index 775421b..0d7c53a 100644
--- a/lib/state.cpp
+++ b/lib/state.cpp
@@ -1,11 +1,39 @@
 #include "state.h"
-#include <malloc.h>
+#include <stdio.h>
 
 int State::size = 19;
 
 State::State( void )
 {
-	board = (type*)malloc(sizeof(type) * size * size);
+	board = new type[size * size];
+}
+
+State::~State( void )
+{
+	delete[] board;
+}
+
+void State::printState( void )
+{
+	int i,j;
+	for (i = 0; i < size; i++) {
+		for (j = 0; j < size; j++) { //for all points:
+			switch (board[i*size + j])
+			{
+				case BLACK:
+					printf("B ");
+					break;
+				case WHITE:
+					printf("W ");
+					break;
+				case BOARD:
+					printf("- ");
+					break;
+			}
+		}
+		printf("\n");
+	}
+	printf("\n");
 }
 
 State State::generateState (SDL_Surface *boardImg, Settings settings)
@@ -13,22 +41,29 @@ State State::generateState (SDL_Surface *boardImg, Settings settings)
 	State state;
 	int i, j, x, y, r, sum;
 	point p;
-	r = 20;
+	r = 10; //what kind of magic number is this?
 	for (i = 0; i < size; i++) {
-		for (j = 0; j < size; j++) {
-			p = positionPoint(i, j, settings);
+		for (j = 0; j < size; j++) { //for all points:
+			p = positionPoint(i, j, settings); //retrieve the estimated point
+			sum = 0;
+
+			//TODO: this loop should be placed into its own function!
 			for (y = p.y-r; y < p.y+r; y++) {
-				for (x = p.x-r; x < p.x+r; x++) {
+				for (x = p.x-r; x < p.x+r; x++) {  //for -20 to 20 around the point
 					uint32_t px = PX(boardImg, x, y);
-					sum += PXR(px) + PXG(px) + PXB(px);
+					sum += (1024 -PXR(px) - PXG(px) + PXB(px)); //sum up the colors
 				}
 			}
+			sum/=400;
+			//printf("%d\t", sum);
 			type t = BOARD;
 			if (sum < settings.getBlackTreshold()) t = BLACK;
 			if (sum > settings.getWhiteTreshold()) t = WHITE;
 			PX_(state.board, i, j, size, size) = t;
 		}
+		//printf("\n");
 	}
+	//printf("\n");
 	return state;
 }
 
diff --git a/lib/state.h b/lib/state.h
index 2c5971b..00a66d8 100644
--- a/lib/state.h
+++ b/lib/state.h
@@ -29,21 +29,30 @@ class State
 		 * Standard constructor
 		 */
 		State( void ); 
+		virtual ~State( void );
 
 		void setSize(int size) { State::size = size; }
+		void printState( void );
 
 		static State generateState( SDL_Surface *board, Settings settings);
 
-
-	private:
 		/*
 		 * Get the image point corresponding to board position (i, j) using
 		 * settings s.
 		 */
 		static point positionPoint(int i, int j, Settings s);
 
+	private:
+
+		/**
+		 * The size of the board, e.g. 19x19, 13x13 etc.
+		 */
 		static int size;
-		type *board; // array describing the board situation
+
+		/**
+		 * array describing the board situation
+		 */
+		type *board;
 
 };
 
diff --git a/qt/CMakeLists.txt b/qt/CMakeLists.txt
index 277bc81..47879df 100644
--- a/qt/CMakeLists.txt
+++ b/qt/CMakeLists.txt
@@ -18,6 +18,7 @@ include(${QT_USE_FILE})
 # the variable "qtproject_SRCS" contains all .cpp files of this project
 set(aigoqt_SRCS
 	aigoqt.cpp
+	clickablelabel.cpp
 	main.cpp
 	)
 
diff --git a/qt/aigoqt.cpp b/qt/aigoqt.cpp
index e55f1b2..f5b511e 100644
--- a/qt/aigoqt.cpp
+++ b/qt/aigoqt.cpp
@@ -1,5 +1,6 @@
 #include "aigoqt.h"
 #include <QtDebug>
+#include <state.h>
 
 AigoQt::AigoQt(QWidget *parent)
 	: QMainWindow(parent)
@@ -9,7 +10,8 @@ AigoQt::AigoQt(QWidget *parent)
 
 	timer = new QTimer(this);
 	connect(timer, SIGNAL(timeout()), this, SLOT(updateImage()));
-	timer->start(200);
+	timer->start(2000);
+
 }
 
 AigoQt::~AigoQt( void )
@@ -26,13 +28,73 @@ void AigoQt::updateImage( void )
 
 void AigoQt::on_buttonSetCorners_clicked( void )
 {
-
+	disconnect(image, 0, 0, 0);
+	connect(image, SIGNAL(clicked(int, int)), this, SLOT(handleCornerClicked(int, int)));
+	statusBar()->showMessage("Please click the upper left corner of the board.");
 }
 
-void AigoQt::on_slider_valueChanged( int value)
+void AigoQt::on_buttonGenerateState_clicked( void )
 {
-	timer->stop();
-	timer->start(value);
+	State state = State::generateState(cam->getSurface(), settings);
+	state.printState();
+}
+
+void AigoQt::on_sliderBlack_valueChanged( int value)
+{
+	settings.setBlackThreshold(value);
+	on_buttonGenerateState_clicked();
+}
+
+void AigoQt::on_sliderWhite_valueChanged( int value)
+{
+	settings.setWhiteThreshold(value);
+	on_buttonGenerateState_clicked();
+}
+
+void AigoQt::on_buttonDrawPoints_clicked( void )
+{
+	for (int i = 0; i < 19; i++)
+	{
+		for (int j = 0; j < 19; j++)
+		{
+			point p = State::positionPoint(i, j, settings);
+			((uint8_t*)cam->getSurface()->pixels)[(p.y*640 + p.x) * 4] = 0xff000000;
+		}
+	}
+	SDL_Surface *s = cam->getSurface();
+	image->setPixmap(QPixmap::fromImage(QImage((uchar*)s->pixels, s->w, s->h, QImage::Format_RGB32)));
+}
+
+void AigoQt::handleCornerClicked( int x, int y)
+{
+	point p;
+	p.x = x;
+	p.y = y;
+
+	QString pointString = QString::fromLatin1("(%1, %2)").arg(x).arg(y);
+
+	static int corner = -1;
+	++corner %= 4;
+	switch (corner)
+	{
+		case 0:
+			settings.setUL(p);
+			statusBar()->showMessage("Upper left set to " + pointString + ". Click upper right.");
+			break;
+		case 1:
+			settings.setUR(p);
+			statusBar()->showMessage("Upper right set to " + pointString + ". Click bottom left.");
+			break;
+		case 2:
+			settings.setBL(p);
+			statusBar()->showMessage("Bottom left set to " + pointString + ". Click bottom right.");
+			break;
+		case 3:
+			settings.setBR(p);
+			statusBar()->showMessage("Bottom right set to " + pointString + ". All done.");
+			disconnect(image, NULL, this, NULL);
+			break;
+	}
 }
 
 #include "aigoqt.moc"
diff --git a/qt/aigoqt.h b/qt/aigoqt.h
index 9e5c716..fad6d49 100644
--- a/qt/aigoqt.h
+++ b/qt/aigoqt.h
@@ -6,6 +6,8 @@
 #include <quickcam.h>
 #include <QTimer>
 
+#include <settings.h>
+
 class AigoQt : public QMainWindow, public Ui::AigoQt
 {
 	Q_OBJECT
@@ -14,17 +16,25 @@ class AigoQt : public QMainWindow, public Ui::AigoQt
 		AigoQt(QWidget *parent = NULL);
 		virtual ~AigoQt( void );
 
-
 	private slots:
 		void on_buttonSetCorners_clicked( void );
-		void on_slider_valueChanged(int value);
+		void on_buttonGenerateState_clicked( void );
+		void on_sliderWhite_valueChanged(int value);
+		void on_sliderBlack_valueChanged(int value);
+
+		void on_buttonDrawPoints_clicked( void );
+
+
+		void handleCornerClicked(int x, int y);
 		void updateImage();
 
 	private:
-
 		Quickcam *cam;
 		QTimer *timer;
 
+		Settings settings;
+
+
 };
 
 #endif /* ifndef _AIGOQT_H_ */
diff --git a/qt/clickablelabel.cpp b/qt/clickablelabel.cpp
new file mode 100644
index 0000000..093ff59
--- /dev/null
+++ b/qt/clickablelabel.cpp
@@ -0,0 +1,14 @@
+#include "clickablelabel.h"
+
+ClickableLabel::ClickableLabel(QWidget *parent)
+	: QLabel(parent)
+{
+	//do nothing
+}
+
+void ClickableLabel::mouseReleaseEvent(QMouseEvent *event)
+{
+	emit clicked(event->x(), event->y());
+}
+
+#include "clickablelabel.moc"
diff --git a/qt/clickablelabel.h b/qt/clickablelabel.h
new file mode 100644
index 0000000..90fce2a
--- /dev/null
+++ b/qt/clickablelabel.h
@@ -0,0 +1,21 @@
+#ifndef _CLICKABLELABEL_H_
+#define _CLICKABLELABEL_H_
+
+#include <QMouseEvent>
+#include <QLabel>
+
+class ClickableLabel : public QLabel
+{
+	Q_OBJECT
+
+	public:
+		ClickableLabel(QWidget *parent = NULL);
+		virtual void mouseReleaseEvent(QMouseEvent *event);
+
+	signals:
+		void clicked( int x, int y );
+
+
+};
+
+#endif /* ifndef _CLICKABLELABEL_H_ */
diff --git a/qt/main.ui b/qt/main.ui
index 87bb962..e60db28 100644
--- a/qt/main.ui
+++ b/qt/main.ui
@@ -5,8 +5,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>849</width>
-    <height>644</height>
+    <width>880</width>
+    <height>684</height>
    </rect>
   </property>
   <property name="windowTitle" >
@@ -20,31 +20,6 @@
     <property name="spacing" >
      <number>6</number>
     </property>
-    <item row="1" column="1" >
-     <widget class="QLCDNumber" name="lcdNumber" />
-    </item>
-    <item row="1" column="0" >
-     <widget class="QSlider" name="slider" >
-      <property name="minimum" >
-       <number>10</number>
-      </property>
-      <property name="maximum" >
-       <number>400</number>
-      </property>
-      <property name="singleStep" >
-       <number>10</number>
-      </property>
-      <property name="pageStep" >
-       <number>50</number>
-      </property>
-      <property name="value" >
-       <number>200</number>
-      </property>
-      <property name="orientation" >
-       <enum>Qt::Horizontal</enum>
-      </property>
-     </widget>
-    </item>
     <item row="0" column="1" >
      <widget class="QGroupBox" name="groupBox_2" >
       <property name="sizePolicy" >
@@ -72,6 +47,20 @@
          </property>
         </widget>
        </item>
+       <item>
+        <widget class="QPushButton" name="buttonGenerateState" >
+         <property name="text" >
+          <string>Generate state</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QPushButton" name="buttonDrawPoints" >
+         <property name="text" >
+          <string>Draw points</string>
+         </property>
+        </widget>
+       </item>
        <item>
         <spacer>
          <property name="orientation" >
@@ -88,6 +77,28 @@
       </layout>
      </widget>
     </item>
+    <item row="1" column="0" >
+     <widget class="QSlider" name="sliderWhite" >
+      <property name="minimum" >
+       <number>100</number>
+      </property>
+      <property name="maximum" >
+       <number>1000</number>
+      </property>
+      <property name="singleStep" >
+       <number>10</number>
+      </property>
+      <property name="pageStep" >
+       <number>50</number>
+      </property>
+      <property name="value" >
+       <number>200</number>
+      </property>
+      <property name="orientation" >
+       <enum>Qt::Horizontal</enum>
+      </property>
+     </widget>
+    </item>
     <item row="0" column="0" >
      <widget class="QGroupBox" name="groupBox" >
       <property name="minimumSize" >
@@ -99,7 +110,7 @@
       <property name="title" >
        <string>Preview</string>
       </property>
-      <widget class="QLabel" name="image" >
+      <widget class="ClickableLabel" name="image" >
        <property name="geometry" >
         <rect>
          <x>40</x>
@@ -126,6 +137,25 @@
       </widget>
      </widget>
     </item>
+    <item row="1" column="1" >
+     <widget class="QLCDNumber" name="lcdNumber" />
+    </item>
+    <item row="2" column="0" >
+     <widget class="QSlider" name="sliderBlack" >
+      <property name="minimum" >
+       <number>100</number>
+      </property>
+      <property name="maximum" >
+       <number>1000</number>
+      </property>
+      <property name="orientation" >
+       <enum>Qt::Horizontal</enum>
+      </property>
+     </widget>
+    </item>
+    <item row="2" column="1" >
+     <widget class="QLCDNumber" name="lcdNumber_2" />
+    </item>
    </layout>
   </widget>
   <widget class="QMenuBar" name="menubar" >
@@ -133,7 +163,7 @@
     <rect>
      <x>0</x>
      <y>0</y>
-     <width>849</width>
+     <width>880</width>
      <height>25</height>
     </rect>
    </property>
@@ -152,10 +182,17 @@
    </property>
   </action>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ClickableLabel</class>
+   <extends>QLabel</extends>
+   <header>clickablelabel.h</header>
+  </customwidget>
+ </customwidgets>
  <resources/>
  <connections>
   <connection>
-   <sender>slider</sender>
+   <sender>sliderWhite</sender>
    <signal>valueChanged(int)</signal>
    <receiver>lcdNumber</receiver>
    <slot>display(int)</slot>
@@ -171,18 +208,50 @@
    </hints>
   </connection>
   <connection>
-   <sender>slider</sender>
+   <sender>sliderWhite</sender>
    <signal>sliderMoved(int)</signal>
    <receiver>lcdNumber</receiver>
    <slot>display(int)</slot>
    <hints>
     <hint type="sourcelabel" >
      <x>542</x>
-     <y>621</y>
+     <y>612</y>
     </hint>
     <hint type="destinationlabel" >
-     <x>829</x>
-     <y>628</y>
+     <x>834</x>
+     <y>619</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>sliderBlack</sender>
+   <signal>valueChanged(int)</signal>
+   <receiver>lcdNumber_2</receiver>
+   <slot>display(int)</slot>
+   <hints>
+    <hint type="sourcelabel" >
+     <x>701</x>
+     <y>638</y>
+    </hint>
+    <hint type="destinationlabel" >
+     <x>749</x>
+     <y>640</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>sliderBlack</sender>
+   <signal>sliderMoved(int)</signal>
+   <receiver>lcdNumber_2</receiver>
+   <slot>display(int)</slot>
+   <hints>
+    <hint type="sourcelabel" >
+     <x>561</x>
+     <y>645</y>
+    </hint>
+    <hint type="destinationlabel" >
+     <x>825</x>
+     <y>640</y>
     </hint>
    </hints>
   </connection>