void Plot3DDialog::setColorMapPreview(const QString& fileName)
{
if (fileName.isEmpty()) {
colorMapPreviewLabel->setText(tr("None"));
return;
}
ColorVector cv;
if (!Graph3D::openColorMapFile(cv, fileName)) {
colorMapPreviewLabel->setText(tr("None"));
return;
}
int height = 20;
QPixmap pix;
pix.resize(cv.size(), height);
QPainter p(&pix);
for (unsigned i = 0; i != cv.size(); ++i) {
RGBA rgb = cv[i];
p.setPen(GL2Qt(rgb.r, rgb.g, rgb.b));
p.drawLine(QPoint(0, 0), QPoint(0, height));
p.translate(1, 0);
}
p.end();
colorMapPreviewLabel->setPixmap(pix);
}
void MoodbarRenderer::Render(const ColorVector& colors, QPainter* p,
const QRect& rect) {
// Sample the colors and map them to screen pixels.
ColorVector screen_colors;
for (int x = 0; x < rect.width(); ++x) {
int r = 0;
int g = 0;
int b = 0;
int start = x * colors.size() / rect.width();
int end = (x + 1) * colors.size() / rect.width();
if (start == end) end = qMin(start + 1, colors.size() - 1);
for (int j = start; j < end; j++) {
r += colors[j].red();
g += colors[j].green();
b += colors[j].blue();
}
const int n = qMax(1, end - start);
screen_colors.append(QColor(r / n, g / n, b / n));
}
// Draw the actual moodbar.
for (int x = 0; x < rect.width(); x++) {
int h, s, v;
screen_colors[x].getHsv(&h, &s, &v);
for (int y = 0; y <= rect.height() / 2; y++) {
float coeff = float(y) / float(rect.height() / 2);
float coeff2 = 1.0f - ((1.0f - coeff) * (1.0f - coeff));
coeff = 1.0f - (1.0f - coeff) / 2.0f;
coeff2 = 1.f - (1.f - coeff2) / 2.0f;
p->setPen(QColor::fromHsv(
h, qBound(0, int(float(s) * coeff), 255),
qBound(0, int(255.f - (255.f - float(v)) * coeff2), 255)));
p->drawPoint(rect.left() + x, rect.top() + y);
p->drawPoint(rect.left() + x, rect.top() + rect.height() - 1 - y);
}
}
}
