qt delaunay三角剖分
时间: 2023-06-10 09:07:10 浏览: 50
Qt并没有内置的Delaunay三角剖分算法,但是可以使用第三方库来进行实现。以下是一个使用QDel3D库进行Delaunay三角剖分的例子:
```cpp
#include <Qt3DRender>
#include "qdel3d.h"
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
// 创建一个Qt3D场景
Qt3DExtras::Qt3DWindow view;
view.defaultFrameGraph()->setClearColor(QColor(QRgb(0x4d4d4f)));
Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity;
// 创建一个QDel3D剖分对象并设置数据点
QDel3D qdel3d;
QVector<QVector3D> points;
points << QVector3D(-1.0, -1.0, 0.0) << QVector3D(1.0, -1.0, 0.0) << QVector3D(0.0, 1.0, 0.0);
qdel3d.setPoints(points);
// 获取三角形的索引
QVector<int> indices = qdel3d.triangulate();
// 创建一个Qt3D网格对象
Qt3DRender::QGeometry *geometry = new Qt3DRender::QGeometry(rootEntity);
// 创建一个顶点属性
Qt3DRender::QAttribute *vertexAttribute = new Qt3DRender::QAttribute;
vertexAttribute->setAttributeType(Qt3DRender::QAttribute::VertexAttribute);
vertexAttribute->setBuffer(new Qt3DRender::QBuffer(Qt3DRender::QBuffer::VertexBuffer, geometry));
vertexAttribute->setDataType(Qt3DRender::QAttribute::Float);
vertexAttribute->setDataSize(3);
vertexAttribute->setByteOffset(0);
vertexAttribute->setByteStride(3 * sizeof(float));
geometry->addAttribute(vertexAttribute);
// 创建一个索引属性
Qt3DRender::QAttribute *indexAttribute = new Qt3DRender::QAttribute;
indexAttribute->setAttributeType(Qt3DRender::QAttribute::IndexAttribute);
indexAttribute->setBuffer(new Qt3DRender::QBuffer(Qt3DRender::QBuffer::IndexBuffer, geometry));
indexAttribute->setDataType(Qt3DRender::QAttribute::UnsignedInt);
indexAttribute->setDataSize(1);
indexAttribute->setByteOffset(0);
indexAttribute->setByteStride(sizeof(unsigned int));
geometry->addAttribute(indexAttribute);
// 将剖分结果添加到网格对象中
QByteArray vertexBufferData(reinterpret_cast<const char*>(points.constData()), points.size() * 3 * sizeof(float));
QByteArray indexBufferData(reinterpret_cast<const char*>(indices.constData()), indices.size() * sizeof(unsigned int));
vertexAttribute->buffer()->setData(vertexBufferData);
indexAttribute->buffer()->setData(indexBufferData);
// 创建一个Qt3D渲染对象
Qt3DRender::QGeometryRenderer *render = new Qt3DRender::QGeometryRenderer;
render->setGeometry(geometry);
render->setPrimitiveType(Qt3DRender::QGeometryRenderer::Triangles);
// 将Qt3D场景中的实体添加到根实体中
Qt3DCore::QEntity *entity = new Qt3DCore::QEntity(rootEntity);
entity->addComponent(render);
// 将根实体设置为Qt3D场景中的根实体
view.setRootEntity(rootEntity);
view.show();
return app.exec();
}
```
上述代码创建了一个Qt3D场景,并使用QDel3D库进行了Delaunay三角剖分,然后将剖分结果以Qt3D渲染对象的形式添加到了场景中,最终将根实体设置为了场景的根实体并显示出来。