void GradientTool::drawGradient(MouseState mouse, QImage *image, QColor from, QColor to)
{
QPainter painter(image);
QPoint gradVec = mouse.getPos() - mouse.getClickedAt();
float length = std::sqrt(gradVec.x() * gradVec.x() + gradVec.y() * gradVec.y());
float vecX = gradVec.x() / length;
float vecY = gradVec.y() / length;
qsrand(0);
for(int i(0); i < image->width(); ++i){
for(int j(0); j < image->height(); ++j){
QPoint point = QPoint(i, j) - mouse.getClickedAt();
float val = (float)(point.x() * vecX + point.y() * vecY) / length;
val = std::min(1.f, std::max(0.f, val));
if(m_dithering->isChecked()){
painter.setPen(QPen(m_brushes[(int) round(val * std::pow(2, m_ditheringLevel->value() -1)) * std::pow(2, 5-m_ditheringLevel->value())], 1));
}
else{
if(qrand() %128 < val *128)
painter.setPen(QPen(to));
else
painter.setPen(QPen(from));
}
painter.drawPoint(i, j);
}
}
}
