Added new qml module for drawing lines

CMakeLists.txt

@@ -20,7 +20,11 @@ find_package(Qt5QuickCompiler)
 
 set(CMAKE_AUTOMOC ON)
 set(QT_QML_GENERATE_QMLLS_INI ON)
-qt_wrap_cpp(MOC_FILES include/rqt_demo_plugin/rqt_demo_plugin.hpp)
+
+qt_wrap_cpp(
+  MOC_FILES 
+  include/rqt_demo_plugin/rqt_demo_plugin.hpp
+  include/rqt_demo_plugin/lineItem.hpp)
 qtquick_compiler_add_resources(RCC_SOURCES "resources/res.qrc")
 
 
@@ -28,6 +32,7 @@ add_library(
   rqt_demo_plugin 
   SHARED
   src/rqt_demo_plugin.cpp
+  src/lineItem.cpp
   ${RCC_SOURCES}
   ${MOC_FILES}
 )

include/rqt_demo_plugin/lineItem.hpp

@@ -0,0 +1,32 @@
+#pragma once
+#include <QtQuick/QQuickItem>
+#include <qchar.h>
+#include <qglobal.h>
+#include <qobjectdefs.h>
+#include <qpoint.h>
+#include <qquickitem.h>
+#include <qsgnode.h>
+
+class LineItem : public QQuickItem
+{
+    Q_OBJECT
+
+    Q_PROPERTY(QString stupid READ stupid WRITE setStupid)
+    QML_ELEMENT
+public:
+    LineItem(QQuickItem *parent = nullptr);
+    ~LineItem();
+
+    QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *) override;
+
+    QString stupid() const {return stupid_;}
+
+    void setStupid(const QString &str) {
+        stupid_ = str;
+        qDebug() << str;
+    }
+    
+
+private:
+    QString stupid_;
+};

include/rqt_demo_plugin/rqt_demo_plugin.hpp

@@ -1,5 +1,7 @@
 #pragma once
+
 #include "rqt_gui_cpp/plugin.h"
+
 #include <QtGui>
 #include <QtQuick>
 #include <QtWidgets>

install/rqt_demo_plugin/share/colcon-core/packages/rqt_demo_plugin

@@ -1 +1 @@
-pluginlib:rclcpp:rqt:rqt_gui_cpp
+pluginlib:rclcpp:rqt:rqt_gui_cpp:rqt_image_view

log/latest_build

@@ -1 +1 @@
-build_2025-03-08_17-19-32
+build_2025-03-09_02-21-28

resources/qml/helloworld.qml

@@ -1,11 +1,12 @@
 import QtQuick 2.3
+import LineItem 1.0
 
 Rectangle {
     color: "gray"
     Flickable {
         width: parent.width;
         height: parent.height
-        contentWidth: 2500; contentHeight: 1500
+        contentWidth: 2500*4; contentHeight: 1500*4
         flickDeceleration: 10000
         leftMargin: Math.max((width - contentWidth)/2,0)
         topMargin: Math.max((height - contentHeight)/2,0)
@@ -16,10 +17,10 @@ Rectangle {
             id: contentRect
             anchors.top: parent.top
             anchors.left: parent.left
-            width: parent.width
-            height: parent.height
+            width: parent.width/4
+            height: parent.height/4
             
-            transform: Scale {yScale: 1; xScale: 1}
+            transform: Scale {yScale: 4; xScale: 4}
             transformOrigin: Item.TopLeft
 
             Row {
@@ -43,6 +44,10 @@ Rectangle {
                         text: "Hello, World!"
                     }
                 }
+                LineItem {
+                    height: 100
+                    width: 100
+                }
             }
         }
     }

src/lineItem.cpp

@@ -0,0 +1,44 @@
+#include "rqt_demo_plugin/lineItem.hpp"
+#include <qquickitem.h>
+#include <qsgflatcolormaterial.h>
+#include <qsggeometry.h>
+#include <qsgnode.h>
+#include <qsize.h>
+
+LineItem::LineItem(QQuickItem *parent) 
+    : QQuickItem(parent)
+    , stupid_("") 
+{
+    setFlag(ItemHasContents, true);
+}
+
+LineItem::~LineItem() = default;
+
+
+QSGNode *LineItem::updatePaintNode(QSGNode *old, UpdatePaintNodeData *) 
+{
+    QSGGeometryNode *node = nullptr;
+    QSGGeometry *geometry = nullptr;
+
+    if(!old) {
+        node = new QSGGeometryNode;
+        geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 4);
+        geometry->setLineWidth(5);
+        geometry->setDrawingMode(QSGGeometry::DrawLines);
+        node->setGeometry(geometry);
+        node->setFlag(QSGNode::OwnsGeometry);
+        auto *material = new QSGFlatColorMaterial;
+        material->setColor(QColor(255,0,0));
+        node->setMaterial(material);
+        node->setFlag(QSGNode::OwnsMaterial);
+
+        QSGGeometry::Point2D *verticies = geometry->vertexDataAsPoint2D();
+        QSizeF s = size();
+        verticies[0].set(0.1 * s.width(), 0.1 * s.height());
+        verticies[1].set(0.75 * s.width(), 0.75 * s.height());
+        verticies[2].set(0.1 * s.width(), 0.9 * s.height());
+        verticies[3].set(0.9 * s.width(), 0.1 * s.height());
+        node->markDirty(QSGNode::DirtyGeometry);
+    }
+    return  node;
+}

src/rqt_demo_plugin.cpp

@@ -1,4 +1,5 @@
 #include "rqt_demo_plugin/rqt_demo_plugin.hpp"
+#include "rqt_demo_plugin/lineItem.hpp"
 
 #include "pluginlib/class_list_macros.hpp"
 #include <qnamespace.h>
@@ -10,4 +11,9 @@ mg::DemoPluginMg::DemoPluginMg() : Plugin() {
   fmt.setSwapInterval(0);
   fmt.setRenderableType(QSurfaceFormat::OpenGLES);
   QSurfaceFormat::setDefaultFormat(fmt);
+  static bool typesRegistered = 0;
+  if(!typesRegistered) {
+    qmlRegisterType<LineItem>("LineItem", 1, 0, "LineItem");
+    typesRegistered = 1;
+  }
 }