diff options
author | Gunnar Sletta <gunnar.sletta@digia.com> | 2013-06-11 20:47:54 +0200 |
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committer | The Qt Project <gerrit-noreply@qt-project.org> | 2013-06-14 10:27:34 +0200 |
commit | 76d8f8a5d3a6229c49b072c5872cd99649210107 (patch) | |
tree | 808dcf25be3d7e9cd5a855a613ac3c4138cefae4 /examples/quick/scenegraph/graph/gridnode.cpp | |
parent | 6586505e6bf157089137f3bbf5f31cb70cfaa614 (diff) |
Graph example
Change-Id: I4a7b52f6e14182aed31354dc3860ef187e1899a4
Reviewed-by: Alan Alpert <aalpert@blackberry.com>
Diffstat (limited to 'examples/quick/scenegraph/graph/gridnode.cpp')
-rw-r--r-- | examples/quick/scenegraph/graph/gridnode.cpp | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/examples/quick/scenegraph/graph/gridnode.cpp b/examples/quick/scenegraph/graph/gridnode.cpp new file mode 100644 index 0000000000..2b5e8cac16 --- /dev/null +++ b/examples/quick/scenegraph/graph/gridnode.cpp @@ -0,0 +1,95 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "gridnode.h" + +#include "qmath.h" + +#define GRID_SIZE 32 + +GridNode::GridNode() + : m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0) +{ + setGeometry(&m_geometry); + m_geometry.setDrawingMode(GL_LINES); + + setMaterial(&m_material); + m_material.setColor(Qt::gray); +} + +/* + * The function hardcodes a fixed set of grid lines and scales + * those to the bounding rect. + */ +void GridNode::setRect(const QRectF &rect) +{ + int vCount = int((rect.width() - 1) / GRID_SIZE); + int hCount = int((rect.height() - 1) / GRID_SIZE); + + int lineCount = vCount + hCount; + + QSGGeometry *g = geometry(); + + g->allocate(lineCount * 2); + + float x = rect.x(); + float y = rect.y(); + float w = rect.width(); + float h = rect.height(); + + QSGGeometry::Point2D *v = g->vertexDataAsPoint2D(); + + // Then write the vertical lines + for (int i=0; i<vCount; ++i) { + float dx = (i + 1) * GRID_SIZE; + v[i*2].set(dx, y); + v[i*2+1].set(dx, y + h); + } + v += vCount * 2; + // Then write the horizontal lines + for (int i=0; i<hCount; ++i) { + float dy = (i + 1) * GRID_SIZE; + v[i*2].set(x, dy); + v[i*2+1].set(x + w, dy); + } + + // Tell the scenegraph we updated the geometry.. + markDirty(QSGNode::DirtyGeometry); +} |