private static QImage makeShade(QImage image, boolean highlight, boolean darker) {
double shade_alpha = 0.8;
double shade_size = 0.2;
double hl_pos = GOLDEN_MEAN;
QColor shade_color = QColor.fromRgbF(0, 0, 0, shade_alpha);
QColor transparent = darker ? QColor.fromRgbF(0, 0, 0, 0.25) : QColor.fromRgbF(0, 0, 0, 0);
QColor hl_color = QColor.fromRgbF(1, 1, 1, 0.7);
image = image.copy();
QPainter p = new QPainter();
p.begin(image);
p.scale(image.width(), image.height());
QLinearGradient lg = new QLinearGradient(0, 0, 1, 0);
lg.setColorAt(0, shade_color);
lg.setColorAt(shade_size, transparent);
if (highlight) lg.setColorAt(hl_pos, hl_color);
lg.setColorAt(1 - shade_size, transparent);
lg.setColorAt(1, shade_color);
p.fillRect(0, 0, 1, 1, new QBrush(lg));
if (highlight) {
QRadialGradient rg = new QRadialGradient(hl_pos, 1 - hl_pos, 0.4, hl_pos, 1 - hl_pos);
rg.setColorAt(0, hl_color);
rg.setColorAt(1, transparent);
p.fillRect(0, 0, 1, 1, new QBrush(rg));
}
p.end();
return image;
}
public void third() {
// ! [3]
QGraphicsScene scene = new QGraphicsScene();
QGraphicsView view = new QGraphicsView(scene);
view.show();
// a blue background
scene.setBackgroundBrush(new QBrush(QColor.blue));
// a gradient background
QRadialGradient gradient = new QRadialGradient(0, 0, 10);
gradient.setSpread(QGradient.Spread.RepeatSpread);
scene.setBackgroundBrush(new QBrush(gradient));
// ! [3]
}
private static QImage composeCup(QImage bg_image, QImage fg_image, int size, int warp) {
double coffey_alpha = 1;
QColor dark_brown = QColor.fromRgbF(0.3, 0.15, 0, coffey_alpha);
QColor light_brown = QColor.fromRgbF(0.66, 0.33, 0, coffey_alpha);
QColor highlight = QColor.fromRgbF(1, 1, 0.8, coffey_alpha);
QColor transparent = QColor.transparent;
double highlight_pos = 0.4;
double highlight_size = 0.05;
QImage combined =
new QImage(
size + size / 2, size + warp * 2 + size / 8, QImage.Format.Format_ARGB32_Premultiplied);
combined.fill(0);
QPainter p = new QPainter();
p.begin(combined);
p.setRenderHint(QPainter.RenderHint.Antialiasing);
p.setPen(Qt.PenStyle.NoPen);
// draw the background
p.drawImage(0, 0, bg_image);
// Draw the coffey
QRectF coffey_bounds = new QRectF(0, warp, size, 2 * warp);
QConicalGradient cg =
new QConicalGradient(
coffey_bounds.width() * GOLDEN_MEAN + warp * 0.1,
warp * 1.2 + coffey_bounds.height() / 2.0,
-30);
cg.setColorAt(0, dark_brown);
cg.setColorAt(highlight_pos - highlight_size, light_brown);
cg.setColorAt(0.4, highlight);
cg.setColorAt(highlight_pos + highlight_size, light_brown);
cg.setColorAt(1, dark_brown);
p.setPen(new QPen(new QBrush(QColor.black), size * 0.01));
p.setBrush(new QBrush(cg));
p.drawEllipse(coffey_bounds);
// draw the foreground
p.drawImage(0, warp, fg_image);
// Draw the handle
double handle_dim = size * 0.8;
QRectF handle_bounds = new QRectF(size - handle_dim / 2, size / 3, handle_dim, handle_dim);
double hcx = handle_bounds.width() / 2;
double hcy = handle_bounds.height() / 2;
QImage handle_im =
new QImage(handle_bounds.size().toSize(), QImage.Format.Format_ARGB32_Premultiplied);
{
handle_im.fill(0);
QPainter ph = new QPainter();
ph.begin(handle_im);
QRadialGradient rg = new QRadialGradient(hcx, hcy, hcx, hcx, hcy + size / 30);
double ir = 0.5;
double or = 0.9;
double aa = 0.02;
double shade = 0.08;
rg.setColorAt(ir - aa, transparent);
rg.setColorAt(ir, QColor.fromRgbF(0, 0, 0, 1));
rg.setColorAt(ir + shade, color_green);
rg.setColorAt((ir + or) / 2, QColor.fromRgbF(0.8, 0.85, 0.6));
rg.setColorAt(or - shade, color_green);
rg.setColorAt(or, QColor.fromRgbF(0, 0, 0, 1));
rg.setColorAt(or + aa, transparent);
ph.setBrush(new QBrush(rg));
ph.setPen(Qt.PenStyle.NoPen);
ph.drawEllipse(0, 0, (int) handle_bounds.width(), (int) handle_bounds.height());
QLinearGradient lg = new QLinearGradient(0, 0, handle_bounds.width(), 0);
lg.setColorAt(0.42, transparent);
lg.setColorAt(0.47, QColor.fromRgbF(0, 0, 0));
ph.setBrush(new QBrush(lg));
ph.setCompositionMode(QPainter.CompositionMode.CompositionMode_DestinationIn);
ph.drawRect(0, 0, (int) handle_bounds.width(), (int) handle_bounds.height());
ph.end();
}
p.drawImage(handle_bounds.topLeft(), handle_im);
// The drop shadow...
QRadialGradient dsg = new QRadialGradient(0, 0, 0.5, 0, 0);
dsg.setColorAt(0, QColor.fromRgbF(0, 0, 0, .75));
dsg.setColorAt(1, transparent);
p.translate(size * 3 / 4, size + warp * 1.4);
p.scale(size * 1.5, size / 2);
p.setBrush(new QBrush(dsg));
p.setPen(Qt.PenStyle.NoPen);
p.setCompositionMode(QPainter.CompositionMode.CompositionMode_DestinationOver);
p.drawEllipse(new QRectF(-0.5, -0.5, 1, 1));
// p.drawEllipse(new QRectF(size - size / 2, size + warp - size / 2, size, size));
p.end();
return combined;
}