Results 1 to 3 of 3

Thread: Issue deleting and replacing 3Dscatter and 3DSurface plots in Qt

Threaded View

Previous Post Previous Post   Next Post Next Post
  1. 9th July 2020, 15:13 #1
    Stophe
    Stophe is offline Beginner
    Join Date
    Jul 2020
    Posts
    11
    Thanks
    4
    Thanked 1 Time in 1 Post
    Qt products
    Qt5

    Default Issue deleting and replacing 3Dscatter and 3DSurface plots in Qt

    Hi everybody,
    I'm working with QtDataVisualization in C++ and I've been stuck for half a year with the following problem : when I try to replace a Q3DScatter graph A by a Q3DScatter graph B, the deletion of graph A makes graph B unreadable if B is built before A is destroyed.

    I'm trying to figure out at which point graph A and graph B interact with each other while they are not supposed to. I have a sample code here that is close to a MWE. I have let the function "build" in, but what it does is just initializing the graph and storing its address in a pointer, m3DGraph.

    If PROBLEM is set to false, deletion step and creation of the next data are exchanged, and the issue does not happen, but it's not what I'm looking for since I want to update my display once the data is computed, and to be able to change the type of graph in the m3DImageHolder.

    I think it's worth mentionning that I've done the test with a Q3DSurface graph and there is a similar issue : with Q3DScatter, the graph doesn't display, with Q3DSurface, the grid disappears.

    Here is a bit of code below, and I let a link to my StackOverflow question in case anyone gives an answer months after I stopped working on this.

    Here is the header:
    Qt Code: 
    1. #include <QDialog>
    2. #include <QtWidgets/QLabel>
    3. #include <QtWidgets/QVBoxLayout>
    4. #include <QtDataVisualization/Q3DScatter>
    5. #include <QtDataVisualization/Q3DSurface>
    6.  
    7. namespace QtD = QtDataVisualization;
    8.  
    9. class ViewerTest : public QDialog{
    10. private:
    11.     QPushButton *mHide,*mNewScat,*mNewSurf;
    12.  
    13.     QVBoxLayout *m3DLayoutHolder;
    14.     QHBoxLayout *mButtonsLayout;
    15.     QVBoxLayout *mMainLayout;
    16.  
    17.     QWidget *m3DImageHolder;
    18.  
    19.     QtD::Q3DScatter *m3DGraph;
    20.     QtD::Q3DSurface *m3DGraphSurface;
    21. public:
    22.     enum TYPE{HIDE_BOTH,SCATTER,SURF};
    23.  
    24.     ViewerTest();
    25.     void buildScatter(){manageGraphs(TYPE::SCATTER);};
    26.     void buildSurface(){manageGraphs(TYPE::SURF);};
    27.     void hideAll(){manageGraphs();};
    28.     void build(TYPE type);
    29.     void manageGraphs(TYPE type=HIDE_BOTH); //Shows or hide graphs
    30. };
    To copy to clipboard, switch view to plain text mode 
    Here is the .cpp
    Qt Code: 
    1. #include "test3DvisuData.h"
    2.  
    3. #include <QPushButton>
    4. #include <iostream>
    5. #include <QtDataVisualization/qcustom3dlabel.h>
    6. #include <QtDataVisualization/q3dscatter.h>
    7. #include <QtDataVisualization/q3dsurface.h>
    8. #include <QtDataVisualization/QCustom3DVolume>
    9. #include <QtDataVisualization/Q3DInputHandler>
    10. #include <QtDataVisualization/QHeightMapSurfaceDataProxy>
    11. #include <QApplication>
    12.  
    13. #define PROBLEM true
    14. /// Short class for debugging objects creation
    15. template<typename T> class GraphTest: public T{
    16.     const int mLabel;
    17.     static int label;
    18.     std::string name;
    19. public:
    20.     GraphTest(const std::string & in):T(),mLabel(label++),name(in){
    21.         std::cout<<" ctor "<< name <<mLabel<< std::endl;
    22.     };
    23.     ~GraphTest(){
    24.         std::cout<<" ~dtor "<< name << mLabel<<std::endl;
    25.     };
    26. };
    27.  
    28. template <typename T>int GraphTest<T>::label = 0;
    29.  
    30.  
    31. ViewerTest::ViewerTest():m3DImageHolder(nullptr),m3DGraph(nullptr),m3DGraphSurface(nullptr){
    32.     mHide = new QPushButton("hide",this);
    33.     mNewScat = new QPushButton("scat",this);
    34.     mNewSurf = new QPushButton("surf",this);
    35.  
    36.     m3DLayoutHolder = new QVBoxLayout();
    37.     mButtonsLayout = new QHBoxLayout();
    38.     mMainLayout = new QVBoxLayout(this);
    39.     setLayout(mMainLayout);
    40.     mMainLayout->addLayout(mButtonsLayout);
    41.     mMainLayout->addLayout(m3DLayoutHolder);
    42.  
    43.     mButtonsLayout->addWidget(mHide);
    44.     mButtonsLayout->addWidget(mNewScat);
    45.     mButtonsLayout->addWidget(mNewSurf);
    46.  
    47.     connect(mNewSurf,&QPushButton::released,this,&ViewerTest::buildSurface);
    48.     connect(mNewScat,&QPushButton::released,this,&ViewerTest::buildScatter);
    49.     connect(mHide,&QPushButton::released,this,&ViewerTest::hideAll);
    50.  
    51. }
    52.  
    53. ///This part is just the data construction
    54.  
    55. void ViewerTest::build(TYPE type) {
    56.     if(type==SCATTER) {
    57.         m3DGraph = new /*QtD::Q3DScatter();*/GraphTest<QtD::Q3DScatter>("inData3D");
    58.         m3DGraph->scene()->activeCamera()->setCameraPreset( QtD::Q3DCamera::CameraPresetIsometricRight );
    59.         m3DGraph->setOrthoProjection(true);
    60.         QtD::QCustom3DVolume *vol = new QtD::QCustom3DVolume;
    61.         vol->setScaling(
    62.                     QVector3D(m3DGraph->axisX()->max() - m3DGraph->axisX()->min(),
    63.                              (m3DGraph->axisY()->max() - m3DGraph->axisY()->min()) * 1.0f,
    64.                              m3DGraph->axisZ()->max() - m3DGraph->axisZ()->min()));
    65.         vol->setScalingAbsolute(false);
    66.  
    67.         // Build the data
    68.         unsigned int height(20),width(20),depth(20);
    69.         QVector<uchar> *vectorData = new QVector<uchar>(height * width * depth * 4, 0);
    70.         vol->setTextureWidth(width);vol->setTextureHeight(height);vol->setTextureDepth(depth);
    71.  
    72.         vol->setTextureFormat(QImage::Format_ARGB32);
    73.         for (int z = 0; z < height; z++) {
    74.             for (int y = 0; y < depth; y++) {
    75.                 for (int x = 0; x < width; x++) {
    76.                     for( int c = 0; c<4; c++){
    77.                         (*vectorData)[(x + width * z + width * height * y) * 4 + c] = 
    78.                             c==0?x*5:(c==1?y*5:(c==2?z*5:20));
    79.                     }
    80.                 }
    81.             }
    82.         }
    83.         vol->setTextureData(vectorData);
    84.         m3DGraph->addCustomItem(vol);
    85.     }
    86.  
    87.     ///// ------------------
    88.     else if(type==SURF){
    89.         QImage image = QImage(20,20,QImage::Format_Grayscale8);
    90.         for(uint x=0; x<20; x++){
    91.             for(uint y=0; y<20; y++){
    92.                 image.setPixelColor(x,y,QColor(x*y));
    93.             }
    94.         }
    95.         QtD::QHeightMapSurfaceDataProxy *proxy = new QtD::QHeightMapSurfaceDataProxy(image);
    96.         QtD::QSurface3DSeries *serie = new QtD::QSurface3DSeries(proxy);
    97.         serie->setDrawMode(QtD::QSurface3DSeries::DrawSurface);
    98.  
    99.         m3DGraphSurface = new GraphTest<QtD::Q3DSurface>("inData3DSurface");
    100.         m3DGraphSurface->addSeries(serie);
    101.         m3DGraphSurface->seriesList().at(0)->setColorStyle( QtD::Q3DTheme::ColorStyleRangeGradient );
    102.  
    103.     }
    104.  
    105. }
    To copy to clipboard, switch view to plain text mode 

    and here is the problematic function
    Qt Code: 
    1. void ViewerTest::manageGraphs(TYPE type) {
    2. #if PROBLEM
    3.     build(type); //---> no error thrown, but graph don't display
    4. #endif
    5.  
    6.     // delete previous
    7.     m3DLayoutHolder->removeWidget(m3DImageHolder);
    8.     delete m3DImageHolder;
    9.     m3DImageHolder= nullptr;
    10.  
    11. #if PROBLEM
    12. #else
    13.     build(type); ///---> display works perfectly
    14. #endif
    15.  
    16.     if(type == SCATTER) {
    17.         m3DImageHolder = QWidget::createWindowContainer(m3DGraph, this);
    18.     } else if(type==SURF){
    19.         m3DImageHolder = QWidget::createWindowContainer(m3DGraphSurface,this);
    20.     }
    21.     if(type != TYPE::HIDE_BOTH) {
    22.         m3DLayoutHolder->addWidget(m3DImageHolder);
    23.         m3DImageHolder->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    24.     }
    25.  
    26. }
    27.  
    28. // Just a Widget with two buttons (hide/new)
    29. // OnClick, load a new3D dataset
    30.  
    31. int main(int argc, char** argv){
    32.     QApplication qApplication( argc,  argv);
    33.  
    34.     ViewerTest viewerTest;
    35.     return viewerTest.exec();
    36. }
    To copy to clipboard, switch view to plain text mode 

    If you have any explication of how could I get this to work...? Big thanks in advance, cheers !
    Last edited by Stophe; 9th July 2020 at 15:18. Reason: Last post did not work
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Similar Threads

  1. QHttp Post work inkorect
    By Pablik in forum Qt Programming
    Replies: 12
    Last Post: 29th January 2013, 12:19
  2. Testing Qt-Software with a GUI Testing Tool
    By nightghost in forum Qt Programming
    Replies: 8
    Last Post: 22nd February 2012, 07:43
  3. Dummy post to test the methods of attaching files to a post in the forums
    By SteveH in forum Newbie
    Replies: 6
    Last Post: 25th May 2010, 10:42
  4. GUI Testing
    By larry104 in forum Qt Programming
    Replies: 1
    Last Post: 13th September 2007, 13:46

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide.