added window resize

headers/Mandelbrot.h

@@ -12,6 +12,7 @@ public:
 	void setIterations(int);
 	void translateRelative(QVector2D);
 	void zoomRelative(int, QVector2D);
+	void resizeRelative(QVector2D);
 private:
 	int iterations = 0;
 	QVector2D origin {-2, -1};

headers/OutputWidget.h

@@ -12,7 +12,7 @@ class OutputWidget : public QOpenGLWidget, protected QOpenGLExtraFunctions {
 	Q_OBJECT
 public:
 	explicit OutputWidget(QWidget* parent): QOpenGLWidget(parent) {}
-	Mandelbrot* getMandelbrot() {return &mandelbrot;}
+	Mandelbrot& getMandelbrot() {return mandelbrot;}
 private:
 	void initializeGL() override;
 	void paintGL() override;
@@ -25,11 +25,12 @@ private:
 	void keyPressEvent(QKeyEvent*) override;
 
 	QPoint mousePos;
+	QSize oldSize {0, 0};
 
 	void initShader();
 	static std::vector<QVector2D> genVertices();
 	GLuint createVAO();
-	GLuint vao{};
+	GLuint vao {};
 	QOpenGLShaderProgram shader;
 
 	Mandelbrot mandelbrot;

src/MainWindow.cpp

@@ -22,7 +22,7 @@ void MainWindow::buildUI() {
 			&QSlider::valueChanged,
 			this,
 			[iterationsLabel, this](int value) -> void {
-				this->outputWidget->getMandelbrot()->setIterations(value);
+				this->outputWidget->getMandelbrot().setIterations(value);
 				this->outputWidget->update();
 				iterationsLabel->setNum(value);
 			});

src/Mandelbrot.cpp

@@ -37,6 +37,10 @@ void Mandelbrot::translateRelative(QVector2D relative) {
 	origin -= absolute;
 }
 
+void Mandelbrot::resizeRelative(QVector2D relative) {
+	size *= relative;
+}
+
 
 
 

src/OutputWidget.cpp

@@ -7,7 +7,7 @@ using std::cout, std::endl;
 void OutputWidget::initializeGL() {
 	cout << "Initialize OpenGL" << endl;
 	initializeOpenGLFunctions();
-	getMandelbrot()->init();
+	getMandelbrot().init();
 	initShader();
 
 	auto format = this->format();
@@ -19,11 +19,7 @@ void OutputWidget::initializeGL() {
 }
 
 void OutputWidget::paintGL() {
-	getMandelbrot()->draw(vao, shader);
-}
-
-void OutputWidget::resizeGL(int w, int h) {
-
+	getMandelbrot().draw(vao, shader);
 }
 
 GLuint OutputWidget::createVAO() {
@@ -64,19 +60,35 @@ void OutputWidget::initShader() {
 	if (!shader.bind()) close();
 }
 
-QVector2D relative(QPoint p, QSize s){
+
+QVector2D divide(QPoint p, QSize s){
 	return {
 			float(p.x()) / float(s.width()),
 			float(p.y()) / float(s.height())
 	};
 }
+QVector2D divide(QSize s1, QSize s2){
+	return divide(QPoint(s1.width(), s1.height()), s2);
+}
+
+void OutputWidget::resizeGL(int w, int h) {
+	QSize newSize = QSize(w, h);
+	if (oldSize == QSize(0, 0)){
+		oldSize = newSize;
+		return;
+	}
+	QSize diff = oldSize - newSize;
+	QVector2D relative = QVector2D(1, 1) - divide(diff, oldSize);
+	getMandelbrot().resizeRelative(relative);
+	oldSize = newSize;
+}
 
 void OutputWidget::wheelEvent(QWheelEvent *e) {
 	QPoint pos = e->position().toPoint();
 	int direction = e->angleDelta().y() > 0 ? 1 : -1;
-	QVector2D relativePos = relative(pos, size());
+	QVector2D relativePos = divide(pos, size());
 	relativePos.setY(1 - relativePos.y());
-	getMandelbrot()->zoomRelative(direction, relativePos);
+	getMandelbrot().zoomRelative(direction, relativePos);
 	update();
 }
 
@@ -84,9 +96,9 @@ void OutputWidget::mouseMoveEvent(QMouseEvent *e) {
 	QPoint newMousePos = e->pos();
 	QPoint diff = newMousePos - mousePos;
 	mousePos = newMousePos;
-	QVector2D relativeDiff = relative(diff, size());
+	QVector2D relativeDiff = divide(diff, size());
 	relativeDiff.setY(-relativeDiff.y());
-	getMandelbrot()->translateRelative(relativeDiff);
+	getMandelbrot().translateRelative(relativeDiff);
 	update();
 }