/
trans.h
executable file
·127 lines (109 loc) · 3.5 KB
/
trans.h
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#ifndef TRANS_H
#define TRANS_H
//=======================================================================
// Translation class implementation.
// 19/7/2002, Diego Nehab
//=======================================================================
//=======================================================================
// Trans Class
//=======================================================================
class Trans {
public:
//---------------------------------------------------------------------
// Constructor
//---------------------------------------------------------------------
Trans(float w = 1, float h = 1, float x0 = 0, float y0 = 0);
//---------------------------------------------------------------------
// Mouse down event
// Input
// x, y: coordinates
//---------------------------------------------------------------------
void Down(float x, float y);
//---------------------------------------------------------------------
// Mouse motion event
// Input
// x, y: coordinates
//---------------------------------------------------------------------
void Motion(float x, float y);
//---------------------------------------------------------------------
// Set translation value
// Input
// t: translation amount
//---------------------------------------------------------------------
void Set(const Vector3 &t = Vector3(0,0,0));
//---------------------------------------------------------------------
// Reset viewport and projection parameters
//---------------------------------------------------------------------
void Reset(float w, float h, float x0, float y0);
//---------------------------------------------------------------------
// Mouse down event
// Input
// x, y: coordinates
//---------------------------------------------------------------------
void Up(float x, float y);
//---------------------------------------------------------------------
// Get cumulative translation
//---------------------------------------------------------------------
Vector3 GetTranslation(void) const;
void GetTranslation(float *x, float *y, float *z) const;
private:
Vector3 getv(float x, float y);
// are we dragging?
int drag;
// cumulative translation, mouse down position and current position
Vector3 t, p, m;
// viewport
float w, h, x0, y0;
};
//=======================================================================
// Public Methods
//=======================================================================
inline
Trans::Trans(float w, float h, float x0, float y0) {
Reset(x0, y0, w, h);
drag = false;
}
inline void
Trans::Reset(float w_, float h_, float x0_, float y0_) {
x0 = x0_;
y0 = y0_;
w = w_;
h = h_;
}
inline void
Trans::Down(float x, float y) {
p = m = getv(x, y);
drag = true;
}
inline void
Trans::Up(float x, float y) {
t += getv(x, y) - p;
drag = false;
m = p = Vector3(0,0,0);
}
inline void
Trans::Motion(float x, float y) {
if (drag) m = getv(x, y);
}
inline void
Trans::Set(const Vector3 &ut) {
t = ut;
}
inline Vector3
Trans::GetTranslation(void) const {
return t + m - p;
}
inline void
Trans::GetTranslation(float *x, float *y, float *z) const {
Vector3 r = t + m - p;
*x = r[0];
*y = r[1];
*z = r[2];
}
inline Vector3
Trans::getv(float x, float y) {
x = (x - x0)/w - 0.5;
y = (y - y0)/h - 0.5;
return Vector3(x, y, 1);
}
#endif // TRANS_H