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Fixed issue #591. Control scene max and min scale factor.

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--HG--
branch : develop
This commit is contained in:
Roman Telezhynskyi 2016-12-06 16:18:40 +02:00
parent 0685654c87
commit 2377373a89
2 changed files with 39 additions and 7 deletions
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43
src/libs/vwidgets/vmaingraphicsview.cpp
View file

@ -45,6 +45,7 @@
#include <QTransform>
#include <QWheelEvent>
#include <QWidget>
#include <QDesktopWidget>
#include "../vmisc/def.h"
#include "../vmisc/vmath.h"
@ -57,8 +58,7 @@ class QWheelEvent;
const int GraphicsViewZoom::duration = 300;
const int GraphicsViewZoom::updateInterval = 40;
const qreal maxScale = 50.0; // for zoom in
const qreal minScale = 0.004; // for zoom out
const qreal maxSceneSize = ((50 * 100.0) / 25.4) * PrintDPI; // 50 meters in pixels
//---------------------------------------------------------------------------------------------------------------------
GraphicsViewZoom::GraphicsViewZoom(QGraphicsView* view)
@ -91,8 +91,8 @@ void GraphicsViewZoom::gentle_zoom(double factor)
// We need to check current scale factor because in Windows we have an error when we zoom in or zoom out to much.
// See issue #532: Unexpected error occurs when zoom out image.
// factor > 1 for zoomIn and factor < 1 for zoomOut.
if ((_view->transform().m11() < maxScale && factor > 1) ||
(_view->transform().m11() > minScale && factor < 1))
if ((_view->transform().m11() < VMainGraphicsView::MaxScale() && factor > 1) ||
(_view->transform().m11() > VMainGraphicsView::MinScale() && factor < 1))
{
_view->scale(factor, factor);
if (factor < 1)
@ -360,7 +360,7 @@ void VMainGraphicsView::ZoomIn()
{
// We need to check current scale factor because in Windows we have an error when we zoom in or zoom out to much.
// See issue #532: Unexpected error occurs when zoom out image.
if (this->transform().m11() < maxScale)
if (this->transform().m11() < MaxScale())
{
scale(1.1, 1.1);
VMainGraphicsView::NewSceneRect(this->scene(), this);
@ -373,7 +373,7 @@ void VMainGraphicsView::ZoomOut()
{
// We need to check current scale factor because in Windows we have an error when we zoom in or zoom out to much.
// See issue #532: Unexpected error occurs when zoom out image.
if (this->transform().m11() > minScale)
if (this->transform().m11() > MinScale())
{
scale(1.0/1.1, 1.0/1.1);
VMainGraphicsView::NewSceneRect(this->scene(), this);
@ -406,8 +406,19 @@ void VMainGraphicsView::ZoomFitBest()
}
this->fitInView(rect, Qt::KeepAspectRatio);
QTransform transform = this->transform();
qreal factor = transform.m11();
factor = qMax(factor, MinScale());
factor = qMin(factor, MaxScale());
transform.setMatrix(factor, transform.m12(), transform.m13(), transform.m21(), factor, transform.m23(),
transform.m31(), transform.m32(), transform.m33());
this->setTransform(transform);
VMainGraphicsView::NewSceneRect(scene(), this);
emit NewFactor(this->transform().m11());
emit NewFactor(factor);
}
//---------------------------------------------------------------------------------------------------------------------
@ -482,6 +493,24 @@ void VMainGraphicsView::mouseReleaseEvent(QMouseEvent *event)
}
}
//---------------------------------------------------------------------------------------------------------------------
qreal VMainGraphicsView::MinScale()
{
const QRect screenRect = QApplication::desktop()->availableGeometry();
const qreal screenSize = qMax(screenRect.width(), screenRect.height());
return screenSize / maxSceneSize;
}
//---------------------------------------------------------------------------------------------------------------------
qreal VMainGraphicsView::MaxScale()
{
const QRect screenRect = QApplication::desktop()->availableGeometry();
const qreal screenSize = qMax(screenRect.width(), screenRect.height());
return maxSceneSize / screenSize;
}
//---------------------------------------------------------------------------------------------------------------------
void VMainGraphicsView::setShowToolOptions(bool value)
{

3
src/libs/vwidgets/vmaingraphicsview.h
View file

@ -129,6 +129,9 @@ public:
static void NewSceneRect(QGraphicsScene *sc, QGraphicsView *view);
static QRectF SceneVisibleArea(QGraphicsView *view);
static qreal MinScale();
static qreal MaxScale();
signals:
/**
* @brief NewFactor send new scale factor.