arc_ball.h

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#ifndef H_GEOGRAM_GFX_GLUP_VIEWER_ARCBALL_H
#define H_GEOGRAM_GFX_GLUP_VIEWER_ARCBALL_H
 
#include <geogram_gfx/basic/common.h>
#include <geogram/basic/geometry.h>
 
namespace GEO {
 
    /*******************************************************************/
 
    class GEOGRAM_GFX_API ArcBall {
    public:
    ArcBall();
 
    const mat4& get_value() const {
        return matrix_;
    }
 
    void set_value(const mat4& value);
 
    bool get_x_constraint() const {
        return constrain_x_;
    }
 
    void set_x_constraint(bool value) {
        constrain_x_ = value;
    }
 
    bool get_y_constraint() const {
        return constrain_y_;
    }
 
    void set_y_constraint(bool value) {
        constrain_y_ = value;
    }
 
    void grab(const vec2& value);
 
    void drag(const vec2& value);
 
    void release(const vec2& value);
 
    void reset();
 
    bool grabbed() const {
        return grabbed_;
    }
 
    protected:
    vec3 constrain_vector(
        const vec3& vector,
        const vec3& axis
    ) const;
 
    vec3 mouse_to_sphere( const vec2& p );
 
    private:
    bool grabbed_;
    bool constrain_x_;
    bool constrain_y_;
    vec2 center_;
    double radius_;
 
    vec2 last_point_;
    mat4 matrix_;
    };
 
    /*******************************************************************/
 
}
#endif