/usr/share/doc/libqtexengine-dev/examples/example/renderarea.cpp is in libqtexengine-dev 0.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | #include <QtGui>
#include "renderarea.h"
#include "pixmaps.h"
RenderArea::RenderArea(QWidget *parent)
: QWidget(parent)
{
setBackgroundRole(QPalette::Base);
setAutoFillBackground(true);
setFixedWidth(600);
setFixedHeight(500);
}
void RenderArea::draw(QPainter *painter)
{
static const QPoint points[4] = {
QPoint(10, 80),
QPoint(20, 10),
QPoint(80, 30),
QPoint(90, 70)
};
QRect rect(10, 20, 80, 60);
QPainterPath path;
path.moveTo(20, 80);
path.lineTo(20, 30);
path.cubicTo(80, 0, 50, 50, 80, 80);
int startAngle = 20 * 16;
int arcLength = 120 * 16;
QLinearGradient linearGrad(QPointF(0, 0), QPointF(100, 100));
linearGrad.setColorAt(0, Qt::black);
linearGrad.setColorAt(1, Qt::red);
QRadialGradient radialGrad(QPointF(50, 50), 50, QPointF(50, 50));
radialGrad.setColorAt(0, Qt::red);
radialGrad.setColorAt(1, Qt::green);
/*QConicalGradient conGrad(QPointF(50, 50), 90);
conGrad.setColorAt(0, Qt::blue);
conGrad.setColorAt(0.5, Qt::red);
conGrad.setColorAt(1, Qt::green);
QBrush brush = QBrush(conGrad);*/
QBrush brush = QBrush(Qt::gray);
int brushStyle = Qt::NoBrush;
int penStyle = Qt::NoPen;
int shape = Rect;
int drawnRects = 0;
for (int x = 0; x < width(); x += 100){
for (int y = 0; y < height(); y += 100){
painter->save();
painter->setRenderHint(QPainter::Antialiasing);
shape = (shape + 1)%14;
penStyle = (penStyle + 1)%4;
if(!penStyle)
penStyle = 1;
if (shape == RoundedRect && drawnRects < 2){
if (drawnRects == 0)
painter->setBrush(QBrush(linearGrad));
else if (drawnRects == 1)
painter->setBrush(QBrush(radialGrad));
drawnRects++;
} else {
brushStyle = (brushStyle + 1)%14;
if(!brushStyle)
brushStyle = 1;
brush.setStyle((Qt::BrushStyle)brushStyle);
painter->setBrush(brush);
}
painter->setPen(QPen(Qt::black, 2, (Qt::PenStyle)penStyle, Qt::FlatCap, Qt::MiterJoin));
painter->translate(x, y);
switch (shape) {
case Line:
painter->drawLine(rect.bottomLeft(), rect.topRight());
break;
case Polyline:
painter->drawPolyline(points, 4);
break;
case Polygon:
painter->drawPolygon(points, 4);
break;
case Rect:
painter->drawRect(rect);
break;
case RoundedRect:
painter->drawRoundedRect(rect, 25, 25, Qt::RelativeSize);
break;
case Ellipse:
painter->drawEllipse(rect);
break;
case Arc:
painter->drawArc(rect, startAngle, arcLength);
break;
case Chord:
painter->drawChord(rect, startAngle, arcLength);
break;
case Pie:
painter->drawPie(rect, startAngle, arcLength);
break;
case Path:
painter->drawPath(path);
break;
case Text:
painter->drawText(rect, Qt::AlignCenter, "QTeXEngine");
break;
case Pixmap:
painter->drawPixmap(10, 10, QPixmap(qt_logo_xpm));
break;
case TiledPixmap:
painter->drawTiledPixmap (QRect(10, 10, 64, 64), QPixmap(brick_xpm));
break;
}
painter->restore();
}
}
painter->setPen(Qt::darkGray);
painter->setBrush(Qt::NoBrush);
painter->drawRect(QRect(9, 9, width() - 18, height() - 18));
}
void RenderArea::paintEvent(QPaintEvent * /* event */)
{
QPainter painter(this);
draw(&painter);
}
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