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#include "NightBackground.h"
NightBackground::NightBackground( Color inColor, int inDirection )
:mColor( inColor ), mDirection( inDirection ) {
}
void NightBackground::draw( double inRotation, Vector3D *inPosition,
double inScale,
double inFadeFactor,
Color *inColor ) {
// radius of one stripe
double xRadius = inScale * 0.5 * 16;
double yRadius = inScale * 5 * 16;
// how far blackness stretches
double farReachX = mDirection * inScale * 23 * 16 + inPosition->mX;
Vector3D corners[4];
// first, set up corners relative to 0,0
corners[0].mX = - xRadius;
corners[0].mY = - yRadius;
corners[0].mZ = 0;
corners[1].mX = xRadius;
corners[1].mY = - yRadius;
corners[1].mZ = 0;
corners[2].mX = xRadius;
corners[2].mY = yRadius;
corners[2].mZ = 0;
corners[3].mX = - xRadius;
corners[3].mY = yRadius;
corners[3].mZ = 0;
int i;
// add inPosition so that center is at inPosition
for( i=0; i<4; i++ ) {
corners[i].add( inPosition );
}
int numStripes = 7;
Vector3D stripeOffset( mDirection * 2 * xRadius, 0, 0 );
glBegin( GL_QUADS ); {
for( int s=1; s<numStripes; s++ ) {
glColor4d( mColor.r, mColor.g, mColor.b,
s / (double)(numStripes-1) );
glVertex2d( corners[0].mX, corners[0].mY );
glVertex2d( corners[1].mX, corners[1].mY );
glVertex2d( corners[2].mX, corners[2].mY );
glVertex2d( corners[3].mX, corners[3].mY );
for( i=0; i<4; i++ ) {
corners[i].add( &stripeOffset );
}
}
// draw solid color farther out
glColor4d( mColor.r, mColor.g, mColor.b, 1 );
int a, b;
if( mDirection == -1 ) {
a = 1;
b = 2;
}
else {
a = 0;
b = 3;
}
glVertex2d( corners[a].mX, corners[a].mY );
glVertex2d( corners[b].mX, corners[b].mY );
glVertex2d( farReachX, corners[b].mY );
glVertex2d( farReachX, corners[a].mY );
}
glEnd();
}
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