Script:Files:script/misc/direction marker.script

object direction_marker {
    void            destroy();

    void            Create( float index, string entityDef, vector position, vector direction );
    void            Fade( float sec, float duration, float start, float end );
    void            Remove();
    void            Update( float sec );

    entity            marker;
    vector            markerOrigin;
    vector            markerNormal;

    float            arrowJoint;

    float            bobStartSec;

    // fade
    float            fadeStartSec;
    float            fadeDurationSec;
    float            fadeStart;
    float            fadeEnd;
};

void direction_marker::destroy() {
    Remove();
}

void direction_marker::Create( float index, string entityDef, vector position, vector direction ) {
    float fraction = sys.tracePoint( position, position + ( vec3_down * MAX_WORLD_SIZE ), CONTENTS_SOLID | CONTENTS_OPAQUE | CONTENTS_WATER, $null_entity );

    if ( fraction == 1.0f ) {
        return;
    }

    bobStartSec = index * 0.025f;

    fadeStartSec = 0.0f;
    fadeDurationSec = 0.0f;
    fadeStart = 1.0f;
    fadeEnd = 1.0f;

    marker = sys.spawnClient( entityDef );
    marker.playCycle( ANIMCHANNEL_ALL, "locking" );

    arrowJoint = marker.getJointHandle( "arrow" );

    markerOrigin = sys.getTraceEndPos();
    markerNormal = sys.getTraceNormal();

    markerOrigin = markerOrigin + markerNormal * 4.0f;

    marker.setOrigin( markerOrigin );

    vector right = sys.crossProduct( markerNormal, direction );
    right = sys.vecNormalize( right );
    vector forward = sys.crossProduct( markerNormal, right );
    forward = sys.vecNormalize( forward );

    marker.setWorldAxis( forward, right, markerNormal );
}

void direction_marker::Fade( float sec, float duration, float start, float end ) {
    if ( marker == $null_entity ) {
        return;
    }

    fadeStartSec = sec;
    fadeDurationSec = duration;
    fadeStart = start;
    fadeEnd = end;
}

void direction_marker::Remove() {
    if ( marker != $null_entity ) {
        marker.remove();
        marker = $null_entity;
    }
}

void direction_marker::Update( float sec ) {
    if ( marker == $null_entity ) {
        return;
    }

    // fading
    float fade;
    if ( sec < fadeStartSec ) {
        fade = fadeStart;
    } else if ( sec > fadeStartSec + fadeDurationSec ) {
        fade = fadeEnd;
    } else if ( fadeDurationSec > 0.0f ) {
        fade = fadeStart + ( ( ( sec - fadeStartSec ) / fadeDurationSec ) * ( fadeEnd - fadeStart ) );
    } else {
        fade = fadeStart;
    }
    marker.setShaderParms( fade, fade, fade, 1.0f );

    // bobbing
    float secInCycle = sys.fmod( sec, 0.6f );    // was 1.0f
    float bobDuration = 0.3f;//0.2f;

    if ( secInCycle < bobStartSec ) {
        // not starting bob yet
        return;
    } else if ( secInCycle > bobStartSec + bobDuration ) {
        // finished bob
        return;
    }

    // in bob
    float secInBob = secInCycle - bobStartSec;
    float fractionInBob = secInBob / bobDuration;
    float verticalBobFraction = ( -0.5f * sys.cos( fractionInBob * 360.0f ) ) + 0.5f;

    //vector offset = verticalBobFraction * markerNormal * 36.0f;
    vector offset = verticalBobFraction * vec3_up * 36.0f;

    //marker.setOrigin( markerOrigin + offset );
    marker.setJointPos( arrowJoint, JOINTMOD_LOCAL, offset );
}