Method drawArc

src/eepp/graphics/primitives.cpp:134–194

}

void Primitives::drawArc( const Vector2f& p, const Float& radius, Uint32 segmentsCount,
						  const Float& arcAngle, const Float& arcStartAngle ) {
	if ( segmentsCount < 6 )
		segmentsCount = 6;
	segmentsCount = segmentsCount > 360 ? 360 : segmentsCount;

	Float angleShift = 360 / static_cast<Float>( segmentsCount );
	Float arcAngleA = arcAngle > 360 ? arcAngle - 360 * std::floor( arcAngle / 360 ) : arcAngle;
	auto sBR = GlobalBatchRenderer::instance();

	sBR->setTexture( NULL );

	switch ( mFillMode ) {
		case DRAW_LINE: {
			sBR->setLineWidth( mLineWidth );

			segmentsCount = Uint32( (Float)segmentsCount * (Float)eeabs( arcAngleA ) / 360 );
			Float startAngle = Math::radians( arcStartAngle );
			Float theta = Math::radians( arcAngleA ) / Float( segmentsCount - 1 );
			Float tangentialFactor = eetan( theta );
			Float radialFactor = eecos( theta );
			Float x = radius * eecos( startAngle );
			Float y = radius * eesin( startAngle );

			sBR->lineStripBegin();
			sBR->lineStripSetColor( mColor );

			for ( Uint32 ii = 0; ii < segmentsCount; ii++ ) {
				sBR->batchLineStrip( x + p.x, y + p.y );

				Float tx = -y;
				Float ty = x;

				x += tx * tangentialFactor;
				y += ty * tangentialFactor;

				x *= radialFactor;
				y *= radialFactor;
			}

			break;
		}
		case DRAW_FILL: {
			sBR->triangleFanBegin();
			sBR->triangleFanSetColor( mColor );

			for ( Float i = 0; i < arcAngleA; i += angleShift ) {
				Float startAngle = arcStartAngle + i;

				sBR->batchTriangleFan( p.x, p.y, p.x + radius * Math::sinAng( startAngle ),
									   p.y + radius * Math::cosAng( startAngle ),
									   p.x + radius * Math::sinAng( startAngle + angleShift ),
									   p.y + radius * Math::cosAng( startAngle + angleShift ) );
			}

			break;
		}
	}