diff options
Diffstat (limited to 'examples/widgets/graphicsview')
-rw-r--r-- | examples/widgets/graphicsview/collidingmice/mouse.cpp | 10 | ||||
-rw-r--r-- | examples/widgets/graphicsview/diagramscene/arrow.cpp | 6 | ||||
-rw-r--r-- | examples/widgets/graphicsview/elasticnodes/edge.cpp | 7 |
3 files changed, 7 insertions, 16 deletions
diff --git a/examples/widgets/graphicsview/collidingmice/mouse.cpp b/examples/widgets/graphicsview/collidingmice/mouse.cpp index b94c650c18..cc1a15cd82 100644 --- a/examples/widgets/graphicsview/collidingmice/mouse.cpp +++ b/examples/widgets/graphicsview/collidingmice/mouse.cpp @@ -54,7 +54,7 @@ #include <QPainter> #include <QStyleOption> -#include <math.h> +#include <cmath> static const double Pi = 3.14159265358979323846264338327950288419717; static double TwoPi = 2.0 * Pi; @@ -140,9 +140,7 @@ void Mouse::advance(int step) //! [5] QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0)); if (lineToCenter.length() > 150) { - qreal angleToCenter = ::acos(lineToCenter.dx() / lineToCenter.length()); - if (lineToCenter.dy() < 0) - angleToCenter = TwoPi - angleToCenter; + qreal angleToCenter = std::atan2(lineToCenter.dy(), lineToCenter.dx()); angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2); if (angleToCenter < Pi && angleToCenter > Pi / 4) { @@ -171,9 +169,7 @@ void Mouse::advance(int step) continue; QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0)); - qreal angleToMouse = ::acos(lineToMouse.dx() / lineToMouse.length()); - if (lineToMouse.dy() < 0) - angleToMouse = TwoPi - angleToMouse; + qreal angleToMouse = std::atan2(lineToMouse.dy(), lineToMouse.dx()); angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2); if (angleToMouse >= 0 && angleToMouse < Pi / 2) { diff --git a/examples/widgets/graphicsview/diagramscene/arrow.cpp b/examples/widgets/graphicsview/diagramscene/arrow.cpp index 012b9ea2ed..ae7fa7af90 100644 --- a/examples/widgets/graphicsview/diagramscene/arrow.cpp +++ b/examples/widgets/graphicsview/diagramscene/arrow.cpp @@ -51,7 +51,7 @@ #include "arrow.h" -#include <math.h> +#include <cmath> #include <QPen> #include <QPainter> @@ -132,9 +132,7 @@ void Arrow::paint(QPainter *painter, const QStyleOptionGraphicsItem *, setLine(QLineF(intersectPoint, myStartItem->pos())); //! [5] //! [6] - double angle = ::acos(line().dx() / line().length()); - if (line().dy() >= 0) - angle = (Pi * 2) - angle; + double angle = std::atan2(-line().dy(), line().dx()); QPointF arrowP1 = line().p1() + QPointF(sin(angle + Pi / 3) * arrowSize, cos(angle + Pi / 3) * arrowSize); diff --git a/examples/widgets/graphicsview/elasticnodes/edge.cpp b/examples/widgets/graphicsview/elasticnodes/edge.cpp index e794e803cf..d9e4c62e34 100644 --- a/examples/widgets/graphicsview/elasticnodes/edge.cpp +++ b/examples/widgets/graphicsview/elasticnodes/edge.cpp @@ -51,12 +51,11 @@ #include "edge.h" #include "node.h" -#include <math.h> +#include <cmath> #include <QPainter> static const double Pi = 3.14159265358979323846264338327950288419717; -static double TwoPi = 2.0 * Pi; //! [0] Edge::Edge(Node *sourceNode, Node *destNode) @@ -139,9 +138,7 @@ void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) //! [6] // Draw the arrows - double angle = ::acos(line.dx() / line.length()); - if (line.dy() >= 0) - angle = TwoPi - angle; + double angle = std::atan2(-line.dy(), line.dx()); QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + Pi / 3) * arrowSize, cos(angle + Pi / 3) * arrowSize); |