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hammer/hammer_mathlib.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Math functions specific to the editor.
+//
+//===========================================================================//
+
+#ifndef HAMMER_MATHLIB_H
+#define HAMMER_MATHLIB_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+typedef unsigned char byte;
+
+#include "mathlib/mathlib.h"
+#include "mathlib/vmatrix.h"
+#include <math.h>
+
+
+typedef vec_t vec5_t[5];
+
+enum
+{
+	AXIS_X = 0,
+	AXIS_Y,
+	AXIS_Z
+};
+
+//
+// Matrix functions:
+//
+
+void RotateAroundAxis(VMatrix& Matrix, float fDegrees, int nAxis);
+void AxisAngleMatrix(VMatrix& Matrix, const Vector &Axis, float fAngle);
+
+float fixang(float a);
+float lineangle(float x1, float y1, float x2, float y2);
+void polyMake( float x1, float  y1, float x2, float y2, int npoints, float start_ang, Vector *pmPoints );
+float V_rint(float);
+
+inline int fsign( float x) { if(x==0) return 0; else if (x>0) return 1; else return -1; }
+inline bool fequal( float value, float target, float delta) { return ( (value<(target+delta))&&(value>(target-delta)) ); }
+
+void RoundVector( Vector2D &v );
+bool IsLineInside(const Vector2D &pt1, const Vector2D &pt2, int x1, int y1, int x2, int y2);
+bool IsPointInside(const Vector2D &pt, const Vector2D &mins, const Vector2D &maxs );
+
+bool IsValidBox( Vector &mins, Vector &maxs );
+bool IsValidBox( const Vector2D &mins, const Vector2D &maxs );
+void NormalizeBox( Vector &mins, Vector &maxs );
+void NormalizeBox( Vector2D &mins, Vector2D &maxs );
+void PointsFromBox( const Vector &mins, const Vector &maxs, Vector *points );
+void LimitBox( Vector &mins, Vector &maxs, float limit );
+void PointsRevertOrder( Vector *pPoints, int nPoints);
+// Is box 1 inside box 2?
+bool IsBoxInside( const Vector2D &min1, const Vector2D &max1, const Vector2D &min2, const Vector2D &max2 );
+bool IsBoxIntersecting( const Vector2D &min1, const Vector2D &max1, const Vector2D &min2, const Vector2D &max2 );
+
+const Vector &GetNormalFromPoints( const Vector &p1, const Vector &p2, const Vector &p3 );
+const Vector &GetNormalFromFace( int nFace );
+
+inline void TransformPoint( const VMatrix& matrix, Vector &point )
+{
+	Vector orgVector = point;
+	matrix.V3Mul( orgVector, point );
+
+}
+
+// solve equation v0 = x*v1 + y*v2 + z*v3
+void	GetAxisFromFace( int nFace, Vector& vHorz, Vector &vVert, Vector &vThrd );
+bool SolveLinearEquation( const Vector& v0, const Vector& v1, const Vector& v2, const Vector& v3, Vector& vOut);
+// test intersection line & AABB, returns -1 if no intersection occurs
+float IntersectionLineAABBox( const Vector& mins, const Vector& maxs, const Vector& vStart, const Vector& vEnd, int &nFace );
+
+bool BuildAxesFromNormal( const Vector &vNormal, Vector &vHorz, Vector &vVert );
+
+#endif // HAMMER_MATHLIB_H