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| author | Joe Ludwig <[email protected]> | 2013-06-26 15:22:04 -0700 |
|---|---|---|
| committer | Joe Ludwig <[email protected]> | 2013-06-26 15:22:04 -0700 |
| commit | 39ed87570bdb2f86969d4be821c94b722dc71179 (patch) | |
| tree | abc53757f75f40c80278e87650ea92808274aa59 /sp/src/game/shared/shot_manipulator.h | |
| download | source-sdk-2013-39ed87570bdb2f86969d4be821c94b722dc71179.tar.xz source-sdk-2013-39ed87570bdb2f86969d4be821c94b722dc71179.zip | |
First version of the SOurce SDK 2013
Diffstat (limited to 'sp/src/game/shared/shot_manipulator.h')
| -rw-r--r-- | sp/src/game/shared/shot_manipulator.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/sp/src/game/shared/shot_manipulator.h b/sp/src/game/shared/shot_manipulator.h new file mode 100644 index 00000000..62809e46 --- /dev/null +++ b/sp/src/game/shared/shot_manipulator.h @@ -0,0 +1,95 @@ +//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose:
+//
+//=============================================================================//
+
+#ifndef SHOT_MANIPULATOR_H
+#define SHOT_MANIPULATOR_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "mathlib/vector.h"
+
+
+extern ConVar ai_shot_bias_min;
+extern ConVar ai_shot_bias_max;
+
+
+//---------------------------------------------------------
+// Caches off a shot direction and allows you to perform
+// various operations on it without having to recalculate
+// vecRight and vecUp each time.
+//---------------------------------------------------------
+class CShotManipulator
+{
+public:
+ CShotManipulator( const Vector &vecForward )
+ {
+ SetShootDir( vecForward );
+ };
+
+ void SetShootDir( const Vector &vecForward )
+ {
+ m_vecShotDirection = vecForward;
+ VectorVectors( m_vecShotDirection, m_vecRight, m_vecUp );
+ }
+
+ const Vector &ApplySpread( const Vector &vecSpread, float bias = 1.0 );
+
+ const Vector &GetShotDirection() { return m_vecShotDirection; }
+ const Vector &GetResult() { return m_vecResult; }
+ const Vector &GetRightVector() { return m_vecRight; }
+ const Vector &GetUpVector() { return m_vecUp;}
+
+private:
+ Vector m_vecShotDirection;
+ Vector m_vecRight;
+ Vector m_vecUp;
+ Vector m_vecResult;
+};
+
+//---------------------------------------------------------
+// Take a vector (direction) and another vector (spread)
+// and modify the direction to point somewhere within the
+// spread. This used to live inside FireBullets.
+//---------------------------------------------------------
+inline const Vector &CShotManipulator::ApplySpread( const Vector &vecSpread, float bias )
+{
+ // get circular gaussian spread
+ float x, y, z;
+
+ if ( bias > 1.0 )
+ bias = 1.0;
+ else if ( bias < 0.0 )
+ bias = 0.0;
+
+ float shotBiasMin = ai_shot_bias_min.GetFloat();
+ float shotBiasMax = ai_shot_bias_max.GetFloat();
+
+ // 1.0 gaussian, 0.0 is flat, -1.0 is inverse gaussian
+ float shotBias = ( ( shotBiasMax - shotBiasMin ) * bias ) + shotBiasMin;
+
+ float flatness = ( fabsf(shotBias) * 0.5 );
+
+ do
+ {
+ x = random->RandomFloat(-1,1) * flatness + random->RandomFloat(-1,1) * (1 - flatness);
+ y = random->RandomFloat(-1,1) * flatness + random->RandomFloat(-1,1) * (1 - flatness);
+ if ( shotBias < 0 )
+ {
+ x = ( x >= 0 ) ? 1.0 - x : -1.0 - x;
+ y = ( y >= 0 ) ? 1.0 - y : -1.0 - y;
+ }
+ z = x*x+y*y;
+ } while (z > 1);
+
+ m_vecResult = m_vecShotDirection + x * vecSpread.x * m_vecRight + y * vecSpread.y * m_vecUp;
+
+ return m_vecResult;
+}
+
+
+#endif // SHOT_MANIPULATOR_H
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