| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** |
| ** This file is part of the QtQuick module of the Qt Toolkit. |
| ** |
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| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
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| ****************************************************************************/ |
| |
| |
| #include "qquickclipnode_p.h" |
| |
| #include <QtGui/qvector2d.h> |
| #include <QtCore/qmath.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| QQuickDefaultClipNode::QQuickDefaultClipNode(const QRectF &rect) |
| : m_rect(rect) |
| , m_radius(0) |
| , m_dirty_geometry(true) |
| , m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0) |
| { |
| Q_UNUSED(m_reserved); |
| setGeometry(&m_geometry); |
| setIsRectangular(true); |
| } |
| |
| void QQuickDefaultClipNode::setRect(const QRectF &rect) |
| { |
| m_rect = rect; |
| m_dirty_geometry = true; |
| } |
| |
| void QQuickDefaultClipNode::setRadius(qreal radius) |
| { |
| m_radius = radius; |
| m_dirty_geometry = true; |
| setIsRectangular(radius == 0); |
| } |
| |
| void QQuickDefaultClipNode::update() |
| { |
| if (m_dirty_geometry) { |
| updateGeometry(); |
| m_dirty_geometry = false; |
| } |
| } |
| |
| void QQuickDefaultClipNode::updateGeometry() |
| { |
| QSGGeometry *g = geometry(); |
| |
| if (qFuzzyIsNull(m_radius)) { |
| g->allocate(4); |
| QSGGeometry::updateRectGeometry(g, m_rect); |
| |
| } else { |
| int vertexCount = 0; |
| |
| // Radius should never exceeds half of the width or half of the height |
| qreal radius = qMin(qMin(m_rect.width() / 2, m_rect.height() / 2), m_radius); |
| QRectF rect = m_rect; |
| rect.adjust(radius, radius, -radius, -radius); |
| |
| int segments = qMin(30, qCeil(radius)); // Number of segments per corner. |
| |
| g->allocate((segments + 1) * 4); |
| |
| QVector2D *vertices = (QVector2D *)g->vertexData(); |
| |
| for (int part = 0; part < 2; ++part) { |
| for (int i = 0; i <= segments; ++i) { |
| //### Should change to calculate sin/cos only once. |
| qreal angle = qreal(0.5 * M_PI) * (part + i / qreal(segments)); |
| qreal s = qFastSin(angle); |
| qreal c = qFastCos(angle); |
| qreal y = (part ? rect.bottom() : rect.top()) - radius * c; // current inner y-coordinate. |
| qreal lx = rect.left() - radius * s; // current inner left x-coordinate. |
| qreal rx = rect.right() + radius * s; // current inner right x-coordinate. |
| |
| vertices[vertexCount++] = QVector2D(rx, y); |
| vertices[vertexCount++] = QVector2D(lx, y); |
| } |
| } |
| |
| } |
| setClipRect(m_rect); |
| markDirty(DirtyGeometry); |
| } |
| |
| QT_END_NAMESPACE |