void SprayBrush::paintRectangle(KisPainter& painter, qreal x, qreal y, int width, int height, qreal angle, int steps) {
QVector <QPointF> points;
QTransform transform;
qreal halfWidth = width / 2.0;
qreal halfHeight = height / 2.0;
qreal tx, ty;
transform.reset();
transform.rotateRadians( angle );
// top left
transform.map( - halfWidth, - halfHeight, &tx, &ty);
points.append(QPointF(tx + x,ty + y));
// top right
transform.map( + halfWidth, - halfHeight, &tx, &ty);
points.append(QPointF(tx + x,ty + y));
// bottom right
transform.map( + halfWidth, + halfHeight, &tx, &ty);
points.append(QPointF(tx + x,ty + y));
// botom left
transform.map( - halfWidth, + halfHeight, &tx, &ty);
points.append(QPointF(tx + x,ty + y));
painter.setOpacity( int( ( 255 * drand48() ) + 0.5 ) );
painter.setFillStyle(KisPainter::FillStyleForegroundColor);
painter.paintPolygon( points );
}
void SprayBrush::paintEllipse(KisPainter& painter, qreal x, qreal y, int a, int b, qreal angle, int steps) {
QVector <QPointF> points;
qreal beta = -angle;
qreal sinbeta = sin(beta);
qreal cosbeta = cos(beta);
for (int i = 0; i < 360; i += 360.0 / steps)
{
qreal alpha = i * (M_PI / 180) ;
qreal sinalpha = sin(alpha);
qreal cosalpha = cos(alpha);
qreal X = x + (a * cosalpha * cosbeta - b * sinalpha * sinbeta);
qreal Y = y + (a * cosalpha * sinbeta + b * sinalpha * cosbeta);
points.append( QPointF(X, Y) );
}
painter.setOpacity( int( ( 255 * drand48() ) + 0.5 ) );
painter.setFillStyle(KisPainter::FillStyleForegroundColor);
painter.paintPolygon( points );
}
void SprayBrush::paintCircle(KisPainter& painter, qreal x, qreal y, int radius, int steps) {
QVector<QPointF> points;
// circle x, circle y
qreal cx, cy;
qreal length = 2.0 * M_PI;
qreal step = 1.0 / steps;
for (int i = 0; i < steps; i++){
cx = cos(i * step * length);
cy = sin(i * step * length);
cx *= radius;
cy *= radius;
cx += x;
cy += y;
points.append( QPointF(cx, cy) );
}
painter.setOpacity( qRound( OPACITY_OPAQUE * drand48() ) );
painter.setFillStyle( KisPainter::FillStyleForegroundColor );
painter.paintPolygon( points );
}