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Use qRadiansToDegrees() and qDegreesToRadians() more widely 

These document what the arithmetic is actually doing; and save us an
ad-hoc use of an approximate value for pi while we're about it.

Task-number: QTBUG-58083
Change-Id: I82c5502af724b33ec598c5a9da76537f93a95eac
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
This commit is contained in:
Edward Welbourne 2017-01-12 18:02:46 +01:00
parent 53fcf914e2
commit af03eef4ab
5 changed files with 10 additions and 13 deletions
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2
examples/datavisualization/bars/graphmodifier.cpp
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@ -353,7 +353,7 @@ void GraphModifier::zoomToSelectedBar()
// Rotate the camera so that it always points approximately to the graph center
//! [15]
qreal endAngleX = qAtan(qreal(endTarget.z() / endTarget.x())) / M_PI * -180.0 + 90.0;
qreal endAngleX = 90.0 - qRadiansToDegrees(qAtan(qreal(endTarget.z() / endTarget.x())));
if (endTarget.x() > 0.0f)
endAngleX -= 180.0f;
float barValue = m_graph->selectedSeries()->dataProxy()->itemAt(selectedBar.x(),

2
src/datavisualization/data/qbar3dseries.cpp
View File

@ -246,7 +246,7 @@ QPoint QBar3DSeries::invalidSelectionPosition()
static inline float quaternionAngle(const QQuaternion &rotation)
{
return qAcos(rotation.scalar()) * 360.0f / M_PI;
return qRadiansToDegrees(qAcos(rotation.scalar())) * 2.f;
}
/*!

2
src/datavisualization/engine/surface3drenderer.cpp
View File

@ -1150,7 +1150,7 @@ void Surface3DRenderer::drawScene(GLuint defaultFboHandle)
// Need to determine if camera is below graph top
float distanceToCenter = activeCamera->position().length()
/ activeCamera->zoomLevel() / m_autoScaleAdjustment * 100.0f;
qreal cameraAngle = qreal(activeCamera->yRotation()) / 180.0 * M_PI;
qreal cameraAngle = qDegreesToRadians(qreal(activeCamera->yRotation()));
float cameraYPos = float(qSin(cameraAngle)) * distanceToCenter;
m_yFlippedForGrid = cameraYPos < (m_scaleYWithBackground - m_oldCameraTarget.y());
} else if (m_useOrthoProjection && activeCamera->yRotation() == 0.0f) {

13
tests/manual/directional/scatterdatamodifier.cpp
View File

@ -42,7 +42,6 @@ using namespace QtDataVisualization;
const int numberOfCols = 8;
const int numberOfRows = 8;
const float limit = 8.0f;
const float PI = 3.14159f;
#define HEDGEHOG
ScatterDataModifier::ScatterDataModifier(Q3DScatter *scatter)
@ -97,18 +96,18 @@ void ScatterDataModifier::addData()
for (float i = 0; i < numberOfRows; i++) {
float latAngle = float(i) * latAngleStep + 40.0f;
float radius = qSin(latAngle * PI / 180.0f) * limit;
float y = qCos(latAngle * PI / 180.0f) * 1.0f;
float radius = qSin(qDegreesToRadians(latAngle)) * limit;
float y = qCos(qDegreesToRadians(latAngle)) * 1.0f;
#ifdef HEDGEHOG
float angleZ = (qAtan((y * limit / 2.0f) / radius) * 180.0f / PI);
float angleZ = qRadiansToDegrees(qAtan((y * limit / 2.0f) / radius));
QQuaternion rotationZ = QQuaternion::fromAxisAndAngle(QVector3D(0.0f, 0.0f, 1.0f), angleZ - 90.0f);
#endif
for (float j = 0; j < numberOfCols; j++) {
float angle = float(j) * angleStep;
float x = qCos(angle * PI / 180.0f) * radius;
float z = qSin(angle * PI / 180.0f) * radius;
float x = qCos(qDegreesToRadians(angle)) * radius;
float z = qSin(qDegreesToRadians(angle)) * radius;
float angleY = (qAtan(z / x) * 180.0f / PI);
float angleY = qRadiansToDegrees(qAtan(z / x));
if (x < 0)
angleY = 180.0f + angleY;
if (x > 0 && z < 0)

4
tests/manual/galaxy/star.cpp
View File

@ -31,8 +31,6 @@
#include <QtCore/qmath.h>
static const double DEG_TO_RAD = M_PI / 180.0;
Star::Star()
: m_theta(0),
m_a(0),
@ -49,7 +47,7 @@ const void Star::calcXY()
const QVector2D &p = m_center;
qreal beta = -m_angle;
qreal alpha = theta * DEG_TO_RAD;
qreal alpha = qDegreesToRadians(theta);
// temporaries to save cpu time
qreal cosalpha = qCos(alpha);