feat: Render active sketch tool icon at cursor position

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

src/ViewportWidget.cpp

@@ -11,6 +11,7 @@
 #include <QWheelEvent>
 #include <QApplication>
 #include <QPainter>
+#include <QSvgRenderer>
 #include <QWheelEvent>
 #include <QApplication>
 #include <QPropertyAnimation>
@@ -23,6 +24,10 @@ ViewportWidget::ViewportWidget(QWidget *parent)
     m_sketchGrid = new SketchGrid();
     m_featureBrowser = new FeatureBrowser();
     setMouseTracking(true);
+
+    m_toolIcons.insert(static_cast<int>(ApplicationController::ToolType::Line), new QSvgRenderer(QString(":/icons/line.svg"), this));
+    m_toolIcons.insert(static_cast<int>(ApplicationController::ToolType::Rectangle), new QSvgRenderer(QString(":/icons/rectangle.svg"), this));
+    m_toolIcons.insert(static_cast<int>(ApplicationController::ToolType::Circle), new QSvgRenderer(QString(":/icons/circle.svg"), this));
 }
 
 ViewportWidget::~ViewportWidget()
@@ -148,6 +153,17 @@ void ViewportWidget::paintGL()
         drawAxisLabels(painter, model, projection);
     }
     m_featureBrowser->paint(painter, width(), height());
+
+    if (m_currentPlane != SketchPlane::NONE && m_activeTool != static_cast<int>(ApplicationController::ToolType::None) && m_toolIcons.contains(m_activeTool)) {
+        QSvgRenderer* renderer = m_toolIcons.value(m_activeTool);
+        if (renderer && renderer->isValid()) {
+            const QSize iconSize(16, 16);
+            const QPoint iconPos = m_currentMousePos + QPoint(15, 15);
+            const QRect iconRect(iconPos, iconSize);
+            renderer->render(&painter, iconRect);
+        }
+    }
+
     painter.end();
 }
 

src/ViewportWidget.h

@@ -8,7 +8,9 @@
 #include <QVector3D>
 #include <QRect>
 #include <gp_Pnt.hxx>
+#include <QMap>
 
+class QSvgRenderer;
 class ViewCube;
 class SketchGrid;
 class Document;
@@ -88,6 +90,8 @@ private:
     gp_Pnt m_firstLinePoint;
     QPoint m_currentMousePos;
 
+    QMap<int, QSvgRenderer*> m_toolIcons;
+
     float m_xRot = 35.264f * 16.0f; // Default to isometric view
     float m_yRot = -45.0f * 16.0f;    // Default to isometric view
     float m_zoom = -5.0f;