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29
30//
31// W A R N I N G
32// -------------
33//
34// This file is not part of the QtDataVisualization API. It exists purely as an
35// implementation detail. This header file may change from version to
36// version without notice, or even be removed.
37//
38// We mean it.
39
40#ifndef CAMERAHELPER_P_H
41#define CAMERAHELPER_P_H
42
43#include "datavisualizationglobal_p.h"
44#include "q3dcamera.h"
45
46QT_BEGIN_NAMESPACE
47class QMatrix4x4;
48class QPoint;
49QT_END_NAMESPACE
50
51QT_BEGIN_NAMESPACE_DATAVISUALIZATION
52
53class CameraHelper : public QObject
54{
55 Q_OBJECT
56
57private:
58 QVector3D m_position;
59 QVector3D m_target;
60 QVector3D m_up;
61
62 QPoint m_previousMousePos;
63
64 GLfloat m_xRotation;
65 GLfloat m_yRotation;
66 GLfloat m_defaultXRotation;
67 GLfloat m_defaultYRotation;
68
69 GLfloat m_rotationSpeed;
70
71public:
72 explicit CameraHelper(QObject *parent = 0);
73 ~CameraHelper();
74
75 // How fast camera rotates when mouse is dragged. Default is 100.
76 void setRotationSpeed(int speed);
77 // Set camera rotation in degrees
78 void setCameraRotation(const QPointF &rotation);
79 // Get camera rotations
80 QPointF getCameraRotations();
81 // Set default camera orientation. Position's x and y should be 0.
82 void setDefaultCameraOrientation(const QVector3D &defaultPosition,
83 const QVector3D &defaultTarget,
84 const QVector3D &defaultUp);
85 // Calculate view matrix based on rotation and zoom
86 QMatrix4x4 calculateViewMatrix(const QPoint &mousePos, int zoom,
87 int screenWidth, int screenHeight,
88 bool showUnder = false);
89 // Calcluate light position based on rotation. Call after calling calculateViewMatrix to get
90 // up-to-date position
91 QVector3D calculateLightPosition(const QVector3D &lightPosition,
92 GLfloat fixedRotation = 0.0f,
93 GLfloat distanceModifier = 0.0f);
94 void updateMousePos(const QPoint &mousePos);
95 void setCameraPreset(Q3DCamera::CameraPreset preset);
96};
97
98QT_END_NAMESPACE_DATAVISUALIZATION
99
100#endif
101

source code of qtdatavis3d/src/datavisualization/utils/camerahelper_p.h