Shuffling rendered primitives - c++

This is just an experiment I'm doing, but suppose that we have three rectangles that are drawn:
void thisDialog::paintEvent(QPaintEvent *ev)
{
rectangle = new QRect(40, 80, 40, 90);
painter = new QPainter(this);
brush = new QBrush(QColor(QColor::green);
painter->fillRect(...);
painter->drawRect(...);
rectangle2 = new QRect(140, 80, 40, 90);
// and draw
rectangle3 = new QRect(240, 80, 40, 90);
// and draw...
}
And now I want to somehow shuffle the rectangles drawn. My solution is to use std::random_shuffle. The plan is we push all the rectangles into a vector thereof:
vector<QRect*> vecRect;
vecRect.push_back(rectangle);
// push back other rectangles
std::random_shuffle(vecRect.begin(), vecRect.end());
At this point, the order of the rectangles have been shuffled. The only problem is that although they're shuffled I have to somehow reflect that in their positions and also update what's shown on-screen for the changes to be apparent. So, I propose creating a function called shuffle. I want only the x-values to change, so the y-values and the spacings of the rectangles should be left alone.
void shuffle()
{
std::random_shuffle(vecRect.begin(), vecRect.end());
for (auto it : vecRect)
{
// do something to the x-values in rectangle; e.g.
it->setX(/*set something...*/);
}
}
To shuffle the rectangles along the x-axis and maintain the y-axis, and maintain the spacing in between I'd have to get a random number and add the spacing and ensure that it is within the window boundaries say 800x600.
Since I am new to Qt I have to know how Qt handles primitive positions, and so I guess that setX() from the docs would modify the x-position of the rectangle. My other enquiry is: how do we update the positions so they're reflected on what's drawn on-screen? Whenever I update positions it doesn't seem to take effect. I've tried update() but that doesn't seem to work.
Btw, I call the foresaid function through a key press, so if the key 'S' is pressed then the function is called.
TLDR; How can I shuffle x-positions in these rectangles and update their positions rendered?

Related

What differences between QPhongMaterial and QPhongAlphaMaterial? [duplicate]

I have a function that draws triangles through OpenGL
I draw two triangles by pressing a button (function on_drawMapPushButton_clicked()).
Then i draw a sphere that placed above these triangles. And now i see, that sphere is drawed correctly over first triangle, but second triangle drawed over the sphere and not vice versa.
If i press the button second time, then spehere is drawed correctly over first and second triangles.
When i press the button third time, then second triangle drawed over the sphere again.
When i press the button fourth time, then spehere is drawed correctly over first and second triangles and so on.
If i use in sphereMesh QPhongMaterial instead of QPhongAlphaMaterial, then spehere is drawed correctly over first and second triangles always. Like it must to be.
I can't understand what i do wrong to get my sphere is drawed always over the triangles.
Code, that draws transparent sphere:
selectModel_ = new Qt3DExtras::QSphereMesh(selectEntity_);
selectModel_->setRadius(75);
selectModel_->setSlices(150);
selectMaterial_ = new Qt3DExtras::QPhongAlphaMaterial(selectEntity_);
selectMaterial_->setAmbient(QColor(28, 61, 136));
selectMaterial_->setDiffuse(QColor(11, 56, 159));
selectMaterial_->setSpecular(QColor(10, 67, 199));
selectMaterial_->setShininess(0.8f);
selectEntity_->addComponent(selectModel_);
selectEntity_->addComponent(selectMaterial_);
Function drawTriangles:
void drawTriangles(QPolygonF triangles, QColor color){
int numOfVertices = triangles.size();
// Create and fill vertex buffer
QByteArray bufferBytes;
bufferBytes.resize(3 * numOfVertices * static_cast<int>(sizeof(float)));
float *positions = reinterpret_cast<float*>(bufferBytes.data());
for(auto point : triangles){
*positions++ = static_cast<float>(point.x());
*positions++ = 0.0f; //We need to drow only on the surface
*positions++ = static_cast<float>(point.y());
}
geometry_ = new Qt3DRender::QGeometry(mapEntity_);
auto *buf = new Qt3DRender::QBuffer(geometry_);
buf->setData(bufferBytes);
positionAttribute_ = new Qt3DRender::QAttribute(mapEntity_);
positionAttribute_->setName(Qt3DRender::QAttribute::defaultPositionAttributeName());
positionAttribute_->setVertexBaseType(Qt3DRender::QAttribute::Float); //In our buffer we will have only floats
positionAttribute_->setVertexSize(3); // Size of a vertex
positionAttribute_->setAttributeType(Qt3DRender::QAttribute::VertexAttribute); // Attribute type
positionAttribute_->setByteStride(3 * sizeof(float));
positionAttribute_->setBuffer(buf);
geometry_->addAttribute(positionAttribute_); // Add attribute to ours Qt3DRender::QGeometry
// Create and fill an index buffer
QByteArray indexBytes;
indexBytes.resize(numOfVertices * static_cast<int>(sizeof(unsigned int))); // start to end
unsigned int *indices = reinterpret_cast<unsigned int*>(indexBytes.data());
for(unsigned int i = 0; i < static_cast<unsigned int>(numOfVertices); ++i) {
*indices++ = i;
}
auto *indexBuffer = new Qt3DRender::QBuffer(geometry_);
indexBuffer->setData(indexBytes);
indexAttribute_ = new Qt3DRender::QAttribute(geometry_);
indexAttribute_->setVertexBaseType(Qt3DRender::QAttribute::UnsignedInt); //In our buffer we will have only unsigned ints
indexAttribute_->setAttributeType(Qt3DRender::QAttribute::IndexAttribute); // Attribute type
indexAttribute_->setBuffer(indexBuffer);
indexAttribute_->setCount(static_cast<unsigned int>(numOfVertices)); // Set count of our vertices
geometry_->addAttribute(indexAttribute_); // Add the attribute to ours Qt3DRender::QGeometry
shape_ = new Qt3DRender::QGeometryRenderer(mapEntity_);
shape_->setPrimitiveType(Qt3DRender::QGeometryRenderer::Triangles);
shape_->setGeometry(geometry_);
//Create material
material_ = new Qt3DExtras::QPhongMaterial(mapEntity_);
material_->setAmbient(color);
trianglesEntity_ = new Qt3DCore::QEntity(mapEntity_);
trianglesEntity_->addComponent(shape_);
trianglesEntity_->addComponent(material_);
}
Press button handler on_drawMapPushButton_clicked():
void on_drawMapPushButton_clicked()
{
clearMap(); //Implementation is above
QPolygonF triangle1;
triangle1 << QPointF( 0 ,-1000) << QPointF(0 ,1000) << QPointF(1000, -1000);
drawTriangles(triangle1, Qt::black);
QPolygonF triangle2;
triangle2 << QPointF(-1000,-1000) << QPointF(-100,1000) << QPointF(-100,-1000);
drawTriangles(triangle2, Qt::red);
}
Map clearing function clearMap():
void clearMap()
{
if(mapEntity_){
delete mapEntity_;
mapEntity_ = nullptr;
mapEntity_ = new Qt3DCore::QEntity(view3dRootEntity_);
}
}
Ok here comes the extend answer.
The reason why this sometimes happens and sometimes not depends on the order of your entities. If you experiment with two simple spheres, one transparent and one not, you will see that when the sphere that is transparent is added later it will be drawn above the opaque object - just like you want it to.
This happens because the opaque object will be drawn first (it comes first in the scene graph) and the transparent object later which will give you the result you want. In the other case where the transparent object gets drawn first, the opaque object is drawn above because the QPhongAlphaMaterial has a QNoDepthMask render state which tells it not to write to the depth buffer. Thus, the opaque object always passes the depth test, where the transparent object actually already drew to. You have to do some more work to properly draw transparent objects for arbitrary scene graphs and camera positions.
The Qt3D Rendering Graph
To understand what you have to do you should understand how the Qt3D rendering graph is laid out. If you know this already you can skip this part.
Italic words reference items in the graph image in the following text.
If you use a Qt3DWindow, you can't access the root node of rendering graph. It is maintained by the window. You can access the QRenderSettings and root node of your framegraph through the functions activeFramegraph() and renderSettings() which you can both call on the window. You can also set the root node of scene graph through the setRootEntity() function of Qt3DWindow. The window internally has a QAspectEngine, where it sets the root node of the whole graph, which is the root node of the rendering graph in the graph image above.
If you want to insert a framegraph node to the existing framegraph of the 3D window, you have to add it as the parent of the active framegraph which I will explain in the next section. If you have your own custom framegraph which you set on the window through setActiveFramegraph() then just append it to the end, this should suffice.
Using QSortPolicy
As you already found out according to you other questions, you can use QSortPolicy in your framegraph to sort the entities by distance to camera. You can add a sort policy as follows (assuming that view is your Qt3DWindow and scene is your root entity of the scene graph, although I don't understand why it has to be):
Qt3DRender::QFrameGraphNode *framegraph = view.activeFrameGraph();
Qt3DRender::QSortPolicy *sortPolicy = new Qt3DRender::QSortPolicy(scene);
framegraph->setParent(sortPolicy);
QVector<Qt3DRender::QSortPolicy::SortType> sortTypes =
QVector<Qt3DRender::QSortPolicy::SortType>() << Qt3DRender::QSortPolicy::BackToFront;
sortPolicy->setSortTypes(sortTypes);
view.setActiveFrameGraph(framegraph);
The issue with this code is that this sort policy sorts the entities by the distance of their centers to the camera. If one of the opaque objects is closer to the camera than the transparent object it gets drawn later anyways and occludes the transparent object. See the images below for a graphical explanation.
The red and black sphere are further away from the camera than the torus, that's why they get drawn first and they don't occlude the torus.
No the center of the red sphere is closer to the camera than the center of the torus. It gets rendered later than the torus and occludes it.
Using Two Framegraph Branches
You can tackle the issue above if you use two framegraph branches. One which draws all opaque entities and one which draws all transparent ones. To achieve this you have to make use of QLayer and QLayerFilter. You can attach layers to entities and then add layer filters to your framegraph. This way you can exclude entities from entering a certain branch of your framegraph.
Let's say you create two layers, one for opaque objects and one for transparents ones:
Qt3DRender::QLayer *transparentLayer = new Qt3DRender::QLayer;
Qt3DRender::QLayer *opaqueLayer = new Qt3DRender::QLayer;
You have to attach the transparent layer to each transparent object and the opaque layer to each opaque object as a component (using addComponent()).
Unfortunately, you need a special framegraph tree to include the two corresponding layer filters (again, assuming that view is your Qt3DWindow):
Qt3DRender::QRenderSurfaceSelector *renderSurfaceSelector
= new Qt3DRender::QRenderSurfaceSelector();
renderSurfaceSelector->setSurface(&view);
Qt3DRender::QClearBuffers *clearBuffers
= new Qt3DRender::QClearBuffers(renderSurfaceSelector);
clearBuffers->setBuffers(Qt3DRender::QClearBuffers::AllBuffers);
clearBuffers->setClearColor(Qt::white);
This is the first branch to clear the buffers. Now you add the following code:
Qt3DRender::QViewport *viewport = new Qt3DRender::QViewport(renderSurfaceSelector);
Qt3DRender::QCameraSelector *cameraSelector = new Qt3DRender::QCameraSelector(viewport);
Qt3DRender::QCamera *camera = new Qt3DRender::QCamera(cameraSelector);
// set your camera parameters here
cameraSelector->setCamera(camera);
Since you create the QViewport as a child of the QRenderSurfaceSelector it is now a sibling in your framegraph with respect to the QClearBuffers. You can see an illustration of the example framegraphs here.
Now you have to create the two leaf nodes that contain the layer filters. The Qt3D engine always executes a whole branch when it reaches a leaf. This means that first the opaque objects are drawn and then the transparent ones.
// not entirely sure why transparent filter has to go first
// I would have expected the reversed order of the filters but this works...
Qt3DRender::QLayerFilter *transparentFilter = new Qt3DRender::QLayerFilter(camera);
transparentFilter->addLayer(transparentLayer);
Qt3DRender::QLayerFilter *opaqueFilter = new Qt3DRender::QLayerFilter(camera);
opaqueFilter->addLayer(opaqueLayer);
The two layer filters are now leaf nodes in your framegraph branch and Qt3D will first draw the opaque objects and then afterwards, since it uses the same viewport and everything, will draw the transparent objects above. It will draw them correctly (i.e. not in front of parts of opaque objects that the transparent object actually lies behind, because we did not clear the depth buffers again -> Splitting the framegraph happens only on the camera node).
Now set the new framegaph on your Qt3DWindow:
view.setActiveFrameGraph(renderSurfaceSelector);
Result:
Edit (26.03.21): As Patrick B. pointed out correctly, using the suggested solution with two layers you will have to add both layers as components to any lights in the scene. You can get around this by setting the filter mode on the QLayerFilters to QLayerFilter::FilterMode::DiscardAnyMatching and then reverse the order of the filters. This way, the transparentFilter discards any entities with the transparentLayer attached - but not the lights because they don't have the transparentLayer. Vice versa for the opaqueFilter.
My mistake was that i did wrong order of creating and deletion of Triangles and Sphere entities.
In pseudo code right order is as follows:
clearTriangles();
clearSphere();
drawTriangles();
drawSphere();
If you are using Qt3d with QML and want to control the order elements are drawn you can control it by the order of layers in your QML file.
Something like:
{
objectName: "firstLayer"
id : firstLayer
}
Layer {
objectName: "secondLayer"
id: secondLayer
}
The order you add them to layer filters will then control which is drawn first:
RenderSurfaceSelector {
CameraSelector {
id : cameraSelector
camera: mainCamera
FrustumCulling {
ClearBuffers {
buffers : ClearBuffers.AllBuffers
clearColor: "#04151c"
NoDraw {}
}
LayerFilter
{
objectName: "firstLayerFilter"
id: firstLayerFilter
layers: [firstLayer]
}
LayerFilter
{
id: secondLayerFilter
objectName: "secondLayerFilter"
layers: [secondLayer]
}
Then anything you add to the secondLayer will get drawn over-top of the first layer. I used this to make sure text always showed up in front of shapes, but it can be used similarly with transparencies.

Qt3d. Draw transparent QSphereMesh over triangles

I have a function that draws triangles through OpenGL
I draw two triangles by pressing a button (function on_drawMapPushButton_clicked()).
Then i draw a sphere that placed above these triangles. And now i see, that sphere is drawed correctly over first triangle, but second triangle drawed over the sphere and not vice versa.
If i press the button second time, then spehere is drawed correctly over first and second triangles.
When i press the button third time, then second triangle drawed over the sphere again.
When i press the button fourth time, then spehere is drawed correctly over first and second triangles and so on.
If i use in sphereMesh QPhongMaterial instead of QPhongAlphaMaterial, then spehere is drawed correctly over first and second triangles always. Like it must to be.
I can't understand what i do wrong to get my sphere is drawed always over the triangles.
Code, that draws transparent sphere:
selectModel_ = new Qt3DExtras::QSphereMesh(selectEntity_);
selectModel_->setRadius(75);
selectModel_->setSlices(150);
selectMaterial_ = new Qt3DExtras::QPhongAlphaMaterial(selectEntity_);
selectMaterial_->setAmbient(QColor(28, 61, 136));
selectMaterial_->setDiffuse(QColor(11, 56, 159));
selectMaterial_->setSpecular(QColor(10, 67, 199));
selectMaterial_->setShininess(0.8f);
selectEntity_->addComponent(selectModel_);
selectEntity_->addComponent(selectMaterial_);
Function drawTriangles:
void drawTriangles(QPolygonF triangles, QColor color){
int numOfVertices = triangles.size();
// Create and fill vertex buffer
QByteArray bufferBytes;
bufferBytes.resize(3 * numOfVertices * static_cast<int>(sizeof(float)));
float *positions = reinterpret_cast<float*>(bufferBytes.data());
for(auto point : triangles){
*positions++ = static_cast<float>(point.x());
*positions++ = 0.0f; //We need to drow only on the surface
*positions++ = static_cast<float>(point.y());
}
geometry_ = new Qt3DRender::QGeometry(mapEntity_);
auto *buf = new Qt3DRender::QBuffer(geometry_);
buf->setData(bufferBytes);
positionAttribute_ = new Qt3DRender::QAttribute(mapEntity_);
positionAttribute_->setName(Qt3DRender::QAttribute::defaultPositionAttributeName());
positionAttribute_->setVertexBaseType(Qt3DRender::QAttribute::Float); //In our buffer we will have only floats
positionAttribute_->setVertexSize(3); // Size of a vertex
positionAttribute_->setAttributeType(Qt3DRender::QAttribute::VertexAttribute); // Attribute type
positionAttribute_->setByteStride(3 * sizeof(float));
positionAttribute_->setBuffer(buf);
geometry_->addAttribute(positionAttribute_); // Add attribute to ours Qt3DRender::QGeometry
// Create and fill an index buffer
QByteArray indexBytes;
indexBytes.resize(numOfVertices * static_cast<int>(sizeof(unsigned int))); // start to end
unsigned int *indices = reinterpret_cast<unsigned int*>(indexBytes.data());
for(unsigned int i = 0; i < static_cast<unsigned int>(numOfVertices); ++i) {
*indices++ = i;
}
auto *indexBuffer = new Qt3DRender::QBuffer(geometry_);
indexBuffer->setData(indexBytes);
indexAttribute_ = new Qt3DRender::QAttribute(geometry_);
indexAttribute_->setVertexBaseType(Qt3DRender::QAttribute::UnsignedInt); //In our buffer we will have only unsigned ints
indexAttribute_->setAttributeType(Qt3DRender::QAttribute::IndexAttribute); // Attribute type
indexAttribute_->setBuffer(indexBuffer);
indexAttribute_->setCount(static_cast<unsigned int>(numOfVertices)); // Set count of our vertices
geometry_->addAttribute(indexAttribute_); // Add the attribute to ours Qt3DRender::QGeometry
shape_ = new Qt3DRender::QGeometryRenderer(mapEntity_);
shape_->setPrimitiveType(Qt3DRender::QGeometryRenderer::Triangles);
shape_->setGeometry(geometry_);
//Create material
material_ = new Qt3DExtras::QPhongMaterial(mapEntity_);
material_->setAmbient(color);
trianglesEntity_ = new Qt3DCore::QEntity(mapEntity_);
trianglesEntity_->addComponent(shape_);
trianglesEntity_->addComponent(material_);
}
Press button handler on_drawMapPushButton_clicked():
void on_drawMapPushButton_clicked()
{
clearMap(); //Implementation is above
QPolygonF triangle1;
triangle1 << QPointF( 0 ,-1000) << QPointF(0 ,1000) << QPointF(1000, -1000);
drawTriangles(triangle1, Qt::black);
QPolygonF triangle2;
triangle2 << QPointF(-1000,-1000) << QPointF(-100,1000) << QPointF(-100,-1000);
drawTriangles(triangle2, Qt::red);
}
Map clearing function clearMap():
void clearMap()
{
if(mapEntity_){
delete mapEntity_;
mapEntity_ = nullptr;
mapEntity_ = new Qt3DCore::QEntity(view3dRootEntity_);
}
}
Ok here comes the extend answer.
The reason why this sometimes happens and sometimes not depends on the order of your entities. If you experiment with two simple spheres, one transparent and one not, you will see that when the sphere that is transparent is added later it will be drawn above the opaque object - just like you want it to.
This happens because the opaque object will be drawn first (it comes first in the scene graph) and the transparent object later which will give you the result you want. In the other case where the transparent object gets drawn first, the opaque object is drawn above because the QPhongAlphaMaterial has a QNoDepthMask render state which tells it not to write to the depth buffer. Thus, the opaque object always passes the depth test, where the transparent object actually already drew to. You have to do some more work to properly draw transparent objects for arbitrary scene graphs and camera positions.
The Qt3D Rendering Graph
To understand what you have to do you should understand how the Qt3D rendering graph is laid out. If you know this already you can skip this part.
Italic words reference items in the graph image in the following text.
If you use a Qt3DWindow, you can't access the root node of rendering graph. It is maintained by the window. You can access the QRenderSettings and root node of your framegraph through the functions activeFramegraph() and renderSettings() which you can both call on the window. You can also set the root node of scene graph through the setRootEntity() function of Qt3DWindow. The window internally has a QAspectEngine, where it sets the root node of the whole graph, which is the root node of the rendering graph in the graph image above.
If you want to insert a framegraph node to the existing framegraph of the 3D window, you have to add it as the parent of the active framegraph which I will explain in the next section. If you have your own custom framegraph which you set on the window through setActiveFramegraph() then just append it to the end, this should suffice.
Using QSortPolicy
As you already found out according to you other questions, you can use QSortPolicy in your framegraph to sort the entities by distance to camera. You can add a sort policy as follows (assuming that view is your Qt3DWindow and scene is your root entity of the scene graph, although I don't understand why it has to be):
Qt3DRender::QFrameGraphNode *framegraph = view.activeFrameGraph();
Qt3DRender::QSortPolicy *sortPolicy = new Qt3DRender::QSortPolicy(scene);
framegraph->setParent(sortPolicy);
QVector<Qt3DRender::QSortPolicy::SortType> sortTypes =
QVector<Qt3DRender::QSortPolicy::SortType>() << Qt3DRender::QSortPolicy::BackToFront;
sortPolicy->setSortTypes(sortTypes);
view.setActiveFrameGraph(framegraph);
The issue with this code is that this sort policy sorts the entities by the distance of their centers to the camera. If one of the opaque objects is closer to the camera than the transparent object it gets drawn later anyways and occludes the transparent object. See the images below for a graphical explanation.
The red and black sphere are further away from the camera than the torus, that's why they get drawn first and they don't occlude the torus.
No the center of the red sphere is closer to the camera than the center of the torus. It gets rendered later than the torus and occludes it.
Using Two Framegraph Branches
You can tackle the issue above if you use two framegraph branches. One which draws all opaque entities and one which draws all transparent ones. To achieve this you have to make use of QLayer and QLayerFilter. You can attach layers to entities and then add layer filters to your framegraph. This way you can exclude entities from entering a certain branch of your framegraph.
Let's say you create two layers, one for opaque objects and one for transparents ones:
Qt3DRender::QLayer *transparentLayer = new Qt3DRender::QLayer;
Qt3DRender::QLayer *opaqueLayer = new Qt3DRender::QLayer;
You have to attach the transparent layer to each transparent object and the opaque layer to each opaque object as a component (using addComponent()).
Unfortunately, you need a special framegraph tree to include the two corresponding layer filters (again, assuming that view is your Qt3DWindow):
Qt3DRender::QRenderSurfaceSelector *renderSurfaceSelector
= new Qt3DRender::QRenderSurfaceSelector();
renderSurfaceSelector->setSurface(&view);
Qt3DRender::QClearBuffers *clearBuffers
= new Qt3DRender::QClearBuffers(renderSurfaceSelector);
clearBuffers->setBuffers(Qt3DRender::QClearBuffers::AllBuffers);
clearBuffers->setClearColor(Qt::white);
This is the first branch to clear the buffers. Now you add the following code:
Qt3DRender::QViewport *viewport = new Qt3DRender::QViewport(renderSurfaceSelector);
Qt3DRender::QCameraSelector *cameraSelector = new Qt3DRender::QCameraSelector(viewport);
Qt3DRender::QCamera *camera = new Qt3DRender::QCamera(cameraSelector);
// set your camera parameters here
cameraSelector->setCamera(camera);
Since you create the QViewport as a child of the QRenderSurfaceSelector it is now a sibling in your framegraph with respect to the QClearBuffers. You can see an illustration of the example framegraphs here.
Now you have to create the two leaf nodes that contain the layer filters. The Qt3D engine always executes a whole branch when it reaches a leaf. This means that first the opaque objects are drawn and then the transparent ones.
// not entirely sure why transparent filter has to go first
// I would have expected the reversed order of the filters but this works...
Qt3DRender::QLayerFilter *transparentFilter = new Qt3DRender::QLayerFilter(camera);
transparentFilter->addLayer(transparentLayer);
Qt3DRender::QLayerFilter *opaqueFilter = new Qt3DRender::QLayerFilter(camera);
opaqueFilter->addLayer(opaqueLayer);
The two layer filters are now leaf nodes in your framegraph branch and Qt3D will first draw the opaque objects and then afterwards, since it uses the same viewport and everything, will draw the transparent objects above. It will draw them correctly (i.e. not in front of parts of opaque objects that the transparent object actually lies behind, because we did not clear the depth buffers again -> Splitting the framegraph happens only on the camera node).
Now set the new framegaph on your Qt3DWindow:
view.setActiveFrameGraph(renderSurfaceSelector);
Result:
Edit (26.03.21): As Patrick B. pointed out correctly, using the suggested solution with two layers you will have to add both layers as components to any lights in the scene. You can get around this by setting the filter mode on the QLayerFilters to QLayerFilter::FilterMode::DiscardAnyMatching and then reverse the order of the filters. This way, the transparentFilter discards any entities with the transparentLayer attached - but not the lights because they don't have the transparentLayer. Vice versa for the opaqueFilter.
My mistake was that i did wrong order of creating and deletion of Triangles and Sphere entities.
In pseudo code right order is as follows:
clearTriangles();
clearSphere();
drawTriangles();
drawSphere();
If you are using Qt3d with QML and want to control the order elements are drawn you can control it by the order of layers in your QML file.
Something like:
{
objectName: "firstLayer"
id : firstLayer
}
Layer {
objectName: "secondLayer"
id: secondLayer
}
The order you add them to layer filters will then control which is drawn first:
RenderSurfaceSelector {
CameraSelector {
id : cameraSelector
camera: mainCamera
FrustumCulling {
ClearBuffers {
buffers : ClearBuffers.AllBuffers
clearColor: "#04151c"
NoDraw {}
}
LayerFilter
{
objectName: "firstLayerFilter"
id: firstLayerFilter
layers: [firstLayer]
}
LayerFilter
{
id: secondLayerFilter
objectName: "secondLayerFilter"
layers: [secondLayer]
}
Then anything you add to the secondLayer will get drawn over-top of the first layer. I used this to make sure text always showed up in front of shapes, but it can be used similarly with transparencies.

Qt drawing a ring / circle with a hole

I need to draw a circle with QPainter. When I used drawEllipse function like :
void UserClass::Draw(QPainter &painter) {
painter.save();
painter.setBrush( GetColor() );
QPoint centerPosition = GetCenterPosition();
painter.drawEllipse( centerPosition, m_CircleOuterRadius, m_CircleOuterRadius);
painter.setBrush(QColor(0, 0, 0, 0));
painter.drawEllipse( centerPosition, m_CircleInnerRadius, m_CircleInnerRadius);
painter.restore();
}
Unfortunately result is not what I desired. I want to have inner circle not be filled. That is why I put alpha value as zero but ofcourse it didn't work. How can I have a circle which is not until a certain radius with qt ?
You should create a QPainterPath then add the two circles to it via addEllipse(), the outer first, then the inner. This will effectively give you a shape that is the outer circle with the inner circle punched as a hole.
Then you fill the painter path with a green brush, which will result in a hollow ring. Afterwards, if you want the white outlines, you can stroke the path with a white pen as well.
Also note that the painter path can be created only once and stored for reuse instead of creating it anew every time you redraw.

How to appropriately get position of QGraphicsRectItem after drag-release?

I wanted to have an online monitoring system that could tell where the shape is currently, but am getting very weird coordinates of the item, also the dimensions of it get higher by 1 each time I create new one and drag it.
Initial position (map size is 751 by 751, checked by outputting to qDebug(), scene bound to yellow space) :
Dragging it to the left top corner.
As you can see in the beginning it was on (200;200), but after dragging it is on (-201;-196). After deleting it and creating new shape on the same position with the same properties, new shape can't be seen because it is outside of the map, which suggests that edits don't show correct data.
Here is the code of updating the edits:
void CallableGraphicsRectItem::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
{
QGraphicsRectItem::mouseReleaseEvent(event);
ptr->updateEdits(this);
}
Here is what I managed to cut down into updateEdits():
void MainWindow::updateEdits(QAbstractGraphicsShapeItem* item)
{
//stuff not related to scene
auto posReal = item->scenePos();
auto pos = posReal.toPoint();
//create QString from coordinates
QString coordinate;
coordinate.setNum(pos.x());
ui->leftXEdit->setText(coordinate);
coordinate.setNum(pos.y());
ui->upperYEdit->setText(coordinate);
//get width and height for rect, radius for circle
auto boundingRectReal = item->sceneBoundingRect();
auto boundingRect = boundingRectReal.toRect();
ui->widthEdit->setText(QString::number(boundingRect.width()));
//disables height edit for circles, not really relevant
if (!items[currentShapeIndex].isRect)
{
ui->heightEdit->setDisabled(true);
}
else
{
ui->heightEdit->setDisabled(false);
ui->heightEdit->setText(QString::number(boundingRect.height()));
}
}
Here is how I anchor the QGraphicsScene to the left top corner of the yellow area:
scene->setSceneRect(0, 0, mapSize.width() - 20, mapSize.height() - 20);
ui->graphicsView->setScene(scene);
How can I report the right data to the edits?
You're better off overriding the itemChange method and using the ItemPositionHasChanged notification. You have to set the ItemSendsGeometryChanges flag on the item so that it receives these notifications.
I'm not sure that your item's final position has been set when you're still in the mouseReleaseEvent method. Tracking it in itemChange will ensure that the data is valid, and this kind of thing is what it's for.
Also, note that "pos" is in the item's parent coordinates, and "boundingRect" is in the item's coordinate space. You should use "scenePos" and "sceneBoundingRect" if you want to be sure you're using scene coordinates. If the item doesn't have a parent, then "pos" and "scenePos" will return the same values, but "boundingRect" and "sceneBoundingRect" will generally differ.

Qt - Adding a drawing to a Layout

I'm trying to make an application where the user can input some drawings (gestures) that will then be saved and displayed in a gallery on the top of the screen:
When the user presses "Validate", the drawing is supposed to be displayed on the scroll area on the top. However, for some reason, my code is not working the way I intended it to. It saves the drawing with no problem, but when I tell it to add it to the top, nothing happens.
Code here:
void MainWindow::galleryUpdate()
{
for (int i = 0; i < gestureTemplates.size(); i++)
{
QPolygonF scaledGesture = gestureTemplates[i].scaleToSquare(gestureTemplates[i]);
StrokeDrawer * strD = new StrokeDrawer();
QPalette Pal(palette());
Pal.setColor(QPalette::Background, Qt::white);
strD->setMinimumSize(50, 50);
strD->setAutoFillBackground(true);
strD->setPalette(Pal);
galleryList.append(strD);
topZone->addWidget(strD);
strD->setStroke(scaledGesture);
}
}
gestureTemplates is a vector of GestureTemplate (a custom class inheriting from QPolygonF) containing all the drawings. The first line inside the for simply scales the drawing to fit in a square, and returns a QPolygonF.
StrokeDrawer is the class used to display the drawing (code below). I then try to fill it with a white background, save it to galleryList which is a list of StrokeDrawer for each drawing, and then add it to the top, by using topZone->addWidget(strD), where topZone is a HBoxLayout.
I also use the setStroke method to set the drawing to the StrokeDrawer (this method also calls the update() function in the class, which calls its paintEvent, which should take care of actually drawing the QPolygonF).
Initially, I tried to do addWidget by directly using the QPolygonF but that didn't work. That's why I'm using this StrokeDrawer class (which just displays the drawing, it doesn't even allow making changes to it).
By debugging the code on QtCreator, everything works fine until the addWidget line, where nothing happens. I mean, even if the drawing is not being correctly displayed, it should at least show a small, white, 50x50 square, or am I missing something here?
Some code for StrokeDrawer:
void StrokeDrawer::setStroke(QPolygonF g)
{
gesture = g;
update();
}
void StrokeDrawer::paintEvent(QPaintEvent* e)
{
QWidget::paintEvent(e);
QPainter pait(this);
if (!gesture.empty())
pait.drawPolyline(gesture);
}