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43 #include "qquickclipnode_p.h"
45 #include <QtGui/qvector2d.h>
46 #include <QtCore/qmath.h>
48 QQuickDefaultClipNode::QQuickDefaultClipNode(const QRectF &rect)
51 , m_dirty_geometry(true)
52 , m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0)
54 setGeometry(&m_geometry);
55 setIsRectangular(true);
58 void QQuickDefaultClipNode::setRect(const QRectF &rect)
61 m_dirty_geometry = true;
64 void QQuickDefaultClipNode::setRadius(qreal radius)
67 m_dirty_geometry = true;
68 setIsRectangular(radius == 0);
71 void QQuickDefaultClipNode::update()
73 if (m_dirty_geometry) {
75 m_dirty_geometry = false;
79 void QQuickDefaultClipNode::updateGeometry()
81 QSGGeometry *g = geometry();
83 if (qFuzzyIsNull(m_radius)) {
85 QSGGeometry::updateRectGeometry(g, m_rect);
90 // Radius should never exceeds half of the width or half of the height
91 qreal radius = qMin(qMin(m_rect.width() / 2, m_rect.height() / 2), m_radius);
93 rect.adjust(radius, radius, -radius, -radius);
95 int segments = qMin(30, qCeil(radius)); // Number of segments per corner.
97 g->allocate((segments + 1) * 2);
99 QVector2D *vertices = (QVector2D *)g->vertexData();
101 for (int part = 0; part < 2; ++part) {
102 for (int i = 0; i <= segments; ++i) {
103 //### Should change to calculate sin/cos only once.
104 qreal angle = qreal(0.5 * M_PI) * (part + i / qreal(segments));
105 qreal s = qFastSin(angle);
106 qreal c = qFastCos(angle);
107 qreal y = (part ? rect.bottom() : rect.top()) - radius * c; // current inner y-coordinate.
108 qreal lx = rect.left() - radius * s; // current inner left x-coordinate.
109 qreal rx = rect.right() + radius * s; // current inner right x-coordinate.
111 vertices[vertexCount++] = QVector2D(rx, y);
112 vertices[vertexCount++] = QVector2D(lx, y);
116 markDirty(DirtyGeometry);