Whiteboard example: Add configurable target rectangle

thp · Sep 5, 2012 · e183565 · e183565
1 parent 388ed44
commit e183565
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Showing 4 changed files with 58 additions and 16 deletions.
diff --git a/examples/labs/whiteboard/mainwindow.cpp b/examples/labs/whiteboard/mainwindow.cpp
@@ -4,6 +4,8 @@
 #include <QPainter>
 #include <QMouseEvent>
 
+#define DEFAULT_BORDER 20
+
 MainWindow::MainWindow(QWidget *parent) :
     QWidget(parent),
     m_mousePos(0, 0),
@@ -13,18 +15,21 @@ MainWindow::MainWindow(QWidget *parent) :
     m_move(psmove_connect()),
     m_tracker(psmove_tracker_new()),
     m_timer(),
-    m_path()
+    m_path(),
+    m_rect(rect()),
+    m_rectOffset(0)
 {
     m_points[0] = QPointF(1, 1);
     m_points[1] = QPointF(640, 0);
     m_points[2] = QPointF(640, 480);
     m_points[3] = QPointF(0, 480);
     m_mapping.set(m_points);
-    m_mapping.setSize(width(), height());
 
     setMouseTracking(true);
 
-    while (psmove_tracker_enable(m_tracker, m_move) != Tracker_CALIBRATED);
+    if (m_move) {
+        while (psmove_tracker_enable(m_tracker, m_move) != Tracker_CALIBRATED);
+    }
 
     QObject::connect(&m_timer, SIGNAL(timeout()),
                      this, SLOT(timeout()));
@@ -38,6 +43,7 @@ void MainWindow::paintEvent(QPaintEvent *event)
 
     painter.setPen(Qt::blue);
     painter.drawEllipse(m_mapping.map(m_mousePos), 5, 5);
+    painter.drawRect(m_mapping.rect());
 
     painter.setPen(Qt::red);
     painter.drawEllipse(m_mousePos.toPoint(), 5, 5);
@@ -50,21 +56,39 @@ void MainWindow::paintEvent(QPaintEvent *event)
 
 void MainWindow::mouseMoveEvent(QMouseEvent *event)
 {
-    //m_mousePos = event->posF();
-    //update();
+    m_mousePos = event->posF();
+    update();
 }
 
 void MainWindow::resizeEvent(QResizeEvent *event)
 {
-    m_mapping.setSize(width(), height());
+    m_rect = rect().adjusted(DEFAULT_BORDER, DEFAULT_BORDER,
+                             -DEFAULT_BORDER, -DEFAULT_BORDER);
+    syncRect();
 }
 
 void MainWindow::mousePressEvent(QMouseEvent *event)
 {
-    //m_points[m_pointsOffset] = event->posF();
-    //m_pointsOffset = (m_pointsOffset + 1) % 4;
-    //m_mapping.set(m_points);
-    //update();
+    switch (event->button()) {
+        case Qt::LeftButton:
+            m_points[m_pointsOffset] = event->posF();
+            m_pointsOffset = (m_pointsOffset + 1) % 4;
+            m_mapping.set(m_points);
+            break;
+        case Qt::RightButton:
+            if (m_rectOffset == 0) {
+                m_rect.setTopLeft(event->pos());
+            } else {
+                m_rect.setBottomRight(event->pos());
+            }
+            m_rectOffset = (m_rectOffset + 1) % 2;
+            syncRect();
+            break;
+        default:
+            break;
+    }
+
+    update();
 }
 
 MainWindow::~MainWindow()
@@ -116,3 +140,8 @@ void MainWindow::timeout()
     }
 
 }
+
+void MainWindow::syncRect()
+{
+    m_mapping.setRect(m_rect);
+}
diff --git a/examples/labs/whiteboard/mainwindow.h b/examples/labs/whiteboard/mainwindow.h
@@ -25,6 +25,9 @@ class MainWindow : public QWidget
 private slots:
     void timeout();
 
+private:
+    void syncRect();
+
 private:
     QPointF m_mousePos;
     Mapping m_mapping;
@@ -38,6 +41,9 @@ private slots:
     QTimer m_timer;
 
     QPainterPath m_path;
+
+    QRect m_rect;
+    int m_rectOffset;
 };
 
 #endif // MAINWINDOW_H
diff --git a/examples/labs/whiteboard/mapping.h b/examples/labs/whiteboard/mapping.h
@@ -2,21 +2,26 @@
 #define MAPPING_H
 
 #include <QPointF>
+#include <QRect>
 
 #include <qmath.h>
 
 class Mapping
 {
 public:
     Mapping()
-        : a(0, 0), b(1, 0), c(1, 1), d(0, 1), w(1), h(1)
+        : a(0, 0), b(1, 0), c(1, 1), d(0, 1),
+          m_rect(0, 0, 1, 1)
     {
     }
 
-    void setSize(float width, float height)
+    void setRect(QRect rect)
     {
-        w = width;
-        h = height;
+        m_rect = rect;
+    }
+
+    QRect rect() {
+        return m_rect;
     }
 
     void set(QPointF *m)
@@ -45,12 +50,14 @@ class Mapping
 
         double v = (px - p1x) / (p2x - p1x);
 
-        return QPointF(u*w, v*h);
+        return QPointF(m_rect.x() + u*m_rect.width(),
+                       m_rect.y() + v*m_rect.height());
     }
 
 private:
     QPointF a, b, c, d;
     float w, h;
+    QRect m_rect;
 };
 
 #endif // MAPPING_H
diff --git a/examples/labs/whiteboard/whiteboard.pro b/examples/labs/whiteboard/whiteboard.pro
@@ -6,7 +6,7 @@ SOURCES += main.cpp
 SOURCES += mainwindow.cpp
 HEADERS += mainwindow.h
 
-HEADERS += Mapping.h
+HEADERS += mapping.h
 
 INCLUDEPATH += ../../../include/
 LIBS += -L../../../build/ -lpsmoveapi -lpsmoveapi_tracker