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Adding zoom and pan

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This commit is contained in:
Matt Keeter 2014-03-24 19:11:17 -04:00
parent b6368a2663
commit e36ff6ae9c
2 changed files with 36 additions and 6 deletions
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40
src/canvas.cpp
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@ -10,7 +10,7 @@
Canvas::Canvas(const QGLFormat& format, QWidget *parent)
: QGLWidget(format, parent), mesh(NULL),
scale(1), tilt(90), yaw(0), status(" ")
scale(1), zoom(1), tilt(90), yaw(0), status(" ")
{
// Nothing to do here
}
@ -122,12 +122,14 @@ QMatrix4x4 Canvas::view_matrix() const
{
m.scale(-1, width() / float(height()), 0.5);
}
m.scale(zoom, zoom, 1);
return m;
}
void Canvas::mousePressEvent(QMouseEvent* event)
{
if (event->button() == Qt::LeftButton)
if (event->button() == Qt::LeftButton ||
event->button() == Qt::RightButton)
{
mouse_pos = event->pos();
setCursor(Qt::ClosedHandCursor);
@ -136,7 +138,8 @@ void Canvas::mousePressEvent(QMouseEvent* event)
void Canvas::mouseReleaseEvent(QMouseEvent* event)
{
if (event->button() == Qt::LeftButton)
if (event->button() == Qt::LeftButton ||
event->button() == Qt::RightButton)
{
unsetCursor();
}
@ -144,13 +147,38 @@ void Canvas::mouseReleaseEvent(QMouseEvent* event)
void Canvas::mouseMoveEvent(QMouseEvent* event)
{
auto p = event->pos();
auto d = p - mouse_pos;
if (event->buttons() & Qt::LeftButton)
{
auto p = event->pos();
auto d = p - mouse_pos;
yaw = fmod(yaw - d.x(), 360);
tilt = fmax(0, fmin(180, tilt - d.y()));
mouse_pos = p;
update();
}
else if (event->buttons() & Qt::RightButton)
{
qDebug() << d;
center = transform_matrix().inverted() *
view_matrix().inverted() *
QVector3D(-d.x() / (0.5*width()),
d.y() / (0.5*height()), 0);
update();
}
mouse_pos = p;
}
void Canvas::wheelEvent(QWheelEvent *event)
{
if (event->delta() < 0)
{
for (int i=0; i > event->delta(); --i)
zoom *= 1.001;
}
else if (event->delta() > 0)
{
for (int i=0; i < event->delta(); ++i)
zoom /= 1.001;
}
update();
}

2
src/canvas.h
View file

@ -32,6 +32,7 @@ protected:
void mousePressEvent(QMouseEvent* event);
void mouseReleaseEvent(QMouseEvent* event);
void mouseMoveEvent(QMouseEvent* event);
void wheelEvent(QWheelEvent* event);
private:
@ -48,6 +49,7 @@ private:
QVector3D center;
float scale;
float zoom;
float tilt;
float yaw;