feat(viewport): camera mouse controls

src/gui/viewport/Viewport.cpp

@@ -1,16 +1,20 @@
 #include "gui/viewport/Viewport.h"
+#include "gui/viewport/GLCamera.h"
+#include <glm/common.hpp>
 #include <qboxlayout.h>
+#include <qevent.h>
+#include <qnamespace.h>
 #include <qpushbutton.h>
 #include <iostream>
 #include <QTimer>
 #include <QPainterPath>
+#include <QEvent>
 
 Viewport::Viewport(QWidget *parent, Qt::WindowFlags f)
 : QWidget(parent, f)
 {
     mainLayout_=new QVBoxLayout();
-    openGLWidget_ = new ViewportGLWidget(this);
-    mainLayout_->addWidget(openGLWidget_);
+    openGLWidget_ = new ViewportGLWidget(this); mainLayout_->addWidget(openGLWidget_);
     openGLWidget_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     this->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     // mainLayout_->addWidget(new QPushButton("hello world"));
@@ -31,3 +35,103 @@ void Viewport::resizeEvent(QResizeEvent *event)
     QRegion region = QRegion(path.toFillPolygon().toPolygon());
     this->setMask(region);
 }
+
+bool Viewport::event(QEvent *event)
+{
+    switch(event->type())
+    {
+        case QEvent::Wheel:
+        case QEvent::MouseMove:
+        case QEvent::MouseButtonPress:
+        case QEvent::MouseButtonRelease:
+            std::cout << "camera controls\n";
+            handleCamera(event);
+            break;
+        default:
+            std::cout << "event " << event->type() << "\n";
+            break;
+    }
+
+
+    return true;
+}
+
+void Viewport::handleCamera(QEvent *event)
+{
+    switch(event->type())
+    {
+        case QEvent::Wheel:
+        {
+            QWheelEvent* wheelEvent = static_cast<QWheelEvent*>(event);
+            float delta = wheelEvent->angleDelta().y();
+            constexpr float mouseSpeed = 0.7; 
+            openGLWidget_->curCamera.changeRadius(-glm::sign(delta)*mouseSpeed);
+            break;
+        }
+        case QEvent::MouseMove:
+        {
+            QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(event);
+            QPointF mousePos = mouseEvent->position();
+            GLCamera& camera = openGLWidget_->curCamera;
+            constexpr float rotateSpeed = 0.01;
+            constexpr float panSpeed = 0.01;
+            constexpr float zoomSpeed = 0.01;
+
+            if(leftMouseDown_)
+            {
+                QPointF delta = mousePos-leftStartPos_;
+                delta*=rotateSpeed;
+                camera.rotateAroundCenter(delta.x(), {0,1,0});
+                camera.rotateAroundCenter(delta.y(),
+                    camera.getRight() * glm::vec3(1.0f,0.0f,1.0f));
+                leftStartPos_=mousePos;
+            }
+            if(middleMouseDown_)
+            {
+                QPointF delta = mousePos-middleStartPos_;
+                delta *= panSpeed;
+                glm::vec3 up = camera.getUp()*static_cast<float>(-delta.y());
+                glm::vec3 right = camera.getRight()*static_cast<float>(-delta.x());
+
+                camera.changeCenter(up.x+right.x, up.y+right.y, up.z+right.z);
+                camera.movePos(up.x+right.x, up.y+right.y, up.z+right.z);
+                middleStartPos_=mousePos;
+            }
+            if(rightMouseDown_)
+            {
+                QPointF delta = mousePos-rightStartPos_;
+                delta*=zoomSpeed;
+                camera.changeRadius(-delta.x()+delta.y());
+                rightStartPos_=mousePos;
+            }
+            break;
+        }
+        case QEvent::MouseButtonPress:
+        case QEvent::MouseButtonRelease:
+        {
+            bool isDown=event->type()==QEvent::MouseButtonPress;
+            QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(event);
+            switch(mouseEvent->button())
+            {
+                case Qt::LeftButton:
+                    leftMouseDown_=isDown;
+                    if(isDown) leftStartPos_=mouseEvent->position();
+                    break;
+                case Qt::MiddleButton:
+                    middleMouseDown_=isDown;
+                    if(isDown) middleStartPos_=mouseEvent->position();
+                    break;
+                case Qt::RightButton:
+                    rightMouseDown_=isDown;
+                    if(isDown) rightStartPos_=mouseEvent->position();
+                    break;
+                default:
+                    break;
+            }
+            break;
+        }
+        default:
+            break;
+    }
+    std::cout << "event " << event->type() << "\n";
+}

src/gui/viewport/Viewport.h

@@ -12,5 +12,15 @@ private:
     QVBoxLayout* mainLayout_;
     ViewportGLWidget* openGLWidget_;
     void resizeEvent(QResizeEvent *event) override;
+    bool event(QEvent *event) override;
+    Qt::Key cameraMod_ = Qt::Key_Space;
+    void handleCamera(QEvent *event);
 
+    // TODO: maybe simplify positions to mouseDownPos
+    bool middleMouseDown_=false;
+    QPointF middleStartPos_;
+    bool leftMouseDown_=false;
+    QPointF leftStartPos_;
+    bool rightMouseDown_=false;
+    QPointF rightStartPos_;
 };

src/gui/viewport/ViewportGLWidget.cpp

@@ -20,7 +20,7 @@ void ViewportGLWidget::initializeGL()
     loopTimer->start(16);
 
     // init camera
-    camera_ = GLCamera();
+    curCamera = GLCamera();
 
 
 
@@ -133,13 +133,7 @@ void ViewportGLWidget::paintGL()
     );
 
 
-    // glm::mat4 viewMatrix = glm::lookAt(
-    //     glm::vec3(sin(angle_)*5, 1, cos(angle_)*5),
-    //     glm::vec3(0,0,0),
-    //     glm::vec3(0,1,0)
-    // );
-    camera_.rotateAroundCenter(0.01, glm::vec3(0,1,0));
-    glm::mat4 viewMatrix = camera_.getViewMatrix();
+    glm::mat4 viewMatrix = curCamera.getViewMatrix();
 
 
     GLint projMLoc = glGetUniformLocation(shaderProgram, "uProj");

src/gui/viewport/ViewportGLWidget.h

@@ -12,7 +12,7 @@ public:
     QSize sizeHint() const override { return QSize(-1, -1); }
     GLuint vao;
     GLuint shaderProgram;
-    GLCamera camera_;
+    GLCamera curCamera;
 
 protected:
     void initializeGL() override;