Simple drawing example.

apps/notes_tk/CMakeLists.txt

@@ -13,12 +13,13 @@ list(APPEND client_HEADERS
     image_editor/ImageViewWidget.h
     canvas/CanvasView.h
     canvas/CanvasController.h
+    canvas/CanvasDrawingArea.h
+    canvas/CanvasCommandSelectorView.h
     mesh_viewer/MeshViewerView.h
     mesh_viewer/MeshViewerController.h
     mesh_viewer/MeshViewerCanvas.h
     web_client/WebClientView.h)
 
-
 list(APPEND client_LIB_INCLUDES 
     text_editor/TextEditorView.cpp
     text_editor/TextEditorModel.cpp
@@ -32,6 +33,8 @@ list(APPEND client_LIB_INCLUDES
     mesh_viewer/MeshViewerCanvas.cpp
     canvas/CanvasView.cpp
     canvas/CanvasController.cpp
+    canvas/CanvasDrawingArea.cpp
+    canvas/CanvasCommandSelectorView.cpp
     web_client/WebClientView.cpp
     NotesTk.cpp)
    

apps/notes_tk/canvas/CanvasCommandSelectorView.cpp

@@ -0,0 +1,42 @@
+#include "CanvasCommandSelectorView.h"
+
+#include "HorizontalSpacer.h"
+#include "Button.h"
+#include "Theme.h"
+
+CanvasCommandSelectorView::CanvasCommandSelectorView()
+    : Widget()
+{
+    auto circle_button = Button::Create();
+
+    auto on_circle_click = [this](Widget* self){
+        onCommandSelected(CanvasDrawCommand::CIRCLE);
+    };
+    circle_button->setLabel("Circle");
+    circle_button->setBackgroundColor(Theme::getButtonPrimaryBackground());
+    circle_button->setMargin(2);
+    circle_button->setOnClickFunction(on_circle_click);
+
+    auto on_line_click = [this](Widget* self){
+        onCommandSelected(CanvasDrawCommand::LINE);
+    };
+    auto line_button = Button::Create();
+    line_button->setLabel("Line");
+    line_button->setBackgroundColor(Theme::getButtonPrimaryBackground());
+    line_button->setMargin(2);
+    line_button->setOnClickFunction(on_line_click);
+
+    auto hspacer = HorizontalSpacer::Create();
+    hspacer->addWidgetWithScale(std::move(circle_button), 1);
+    hspacer->addWidgetWithScale(std::move(line_button), 1);
+
+    addWidget(std::move(hspacer));
+}
+
+void CanvasCommandSelectorView::onCommandSelected(CanvasDrawCommand command)
+{
+    if(mCommandSelectedCallback)
+    {
+        mCommandSelectedCallback(command);
+    }
+}

apps/notes_tk/canvas/CanvasCommandSelectorView.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "Widget.h"
+#include "CanvasElements.h"
+
+#include <functional>
+
+class CanvasCommandSelectorView : public Widget
+{
+public:
+
+    using onCommandSelectedFunc = std::function<void(CanvasDrawCommand command)>;
+    CanvasCommandSelectorView();
+
+    void setCommandSelectedCallback(onCommandSelectedFunc func)
+    {
+        mCommandSelectedCallback = func;
+    }
+
+    void onCommandSelected(CanvasDrawCommand command);
+
+private:
+    onCommandSelectedFunc mCommandSelectedCallback{nullptr};
+};

apps/notes_tk/canvas/CanvasDrawingArea.cpp

@@ -0,0 +1,54 @@
+#include "CanvasDrawingArea.h"
+
+#include "MouseEvent.h"
+
+#include "GeometryNode.h"
+#include "TransformNode.h"
+#include "CircleNode.h"
+
+#include <iostream>
+
+CanvasDrawingArea::~CanvasDrawingArea()
+{
+
+}
+
+void CanvasDrawingArea::addShapeAt(unsigned x, unsigned y)
+{
+    if (mActiveDrawingCommand == CanvasDrawCommand::CIRCLE)
+    {
+        auto circle = std::make_unique<CircleNode>(DiscretePoint(x, y), 5);
+        circle->setFillColor(Color(255, 0, 0));
+        circle->setName("CanvasDrawingArea_CircleNode");
+
+        mRootNode->addChild(circle.get());
+
+        mSceneNodes.push_back(std::move(circle));
+        mContentDirty = true;
+    }
+}
+
+bool CanvasDrawingArea::isDirty() const
+{
+    return Widget::isDirty() || mContentDirty;
+}
+
+void CanvasDrawingArea::doPaint(const PaintEvent* event)
+{
+    mContentDirty = false;
+}
+
+void CanvasDrawingArea::onMyMouseEvent(const MouseEvent* event)
+{
+    if(event->GetAction() == MouseEvent::Action::Pressed)
+    {
+
+    }
+    else if(event->GetAction() == MouseEvent::Action::Released)
+    {
+        auto client_loc = event->GetClientLocation();
+        auto screen_loc = event->GetScreenLocation();
+
+        addShapeAt(client_loc.GetX(), client_loc.GetY());
+    }
+}

apps/notes_tk/canvas/CanvasDrawingArea.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "Widget.h"
+#include "CanvasElements.h"
+
+class GeometryNode;
+
+class CanvasDrawingArea : public Widget
+{
+public:
+    ~CanvasDrawingArea();
+    void setActiveDrawingCommand(CanvasDrawCommand command)
+    {
+        mActiveDrawingCommand = command;
+    }
+
+private:
+    bool isDirty() const override;
+    void doPaint(const PaintEvent* event) override;
+
+    void onMyMouseEvent(const MouseEvent* event) override;
+
+    void addShapeAt(unsigned x, unsigned y);
+
+    CanvasDrawCommand mActiveDrawingCommand{CanvasDrawCommand::LINE};
+
+    std::vector<std::unique_ptr<GeometryNode> > mSceneNodes;
+    bool mContentDirty{false};
+};

apps/notes_tk/canvas/CanvasElements.h

@@ -0,0 +1,7 @@
+#pragma once
+
+enum class CanvasDrawCommand
+{
+    CIRCLE,
+    LINE
+};

apps/notes_tk/canvas/CanvasView.cpp

@@ -4,15 +4,16 @@
 #include "VerticalSpacer.h"
 
 #include "CanvasController.h"
+#include "CanvasDrawingArea.h"
+#include "CanvasCommandSelectorView.h"
 
 #include "Theme.h"
-
 #include "TextNode.h"
+#include "GeometryNode.h"
+
 #include "Label.h"
 #include "Button.h"
 
-#include <iostream>
-
 CanvasView::CanvasView()
       : mController(CanvasController::Create())
 {
@@ -36,11 +37,28 @@ void CanvasView::initialize()
     label->setBackgroundColor(Theme::getBannerBackground());
     label->setMargin(1);
 
+    auto controls = std::make_unique<CanvasCommandSelectorView>();
+    controls->setBackgroundColor(Theme::getBannerBackground());
+    controls->setMargin(1);
 
+    auto on_draw_command_changed = [this](CanvasDrawCommand command){
+        onDrawCommandChanged(command);
+    };
+    controls->setCommandSelectedCallback(on_draw_command_changed);
+
+    auto drawing_area = std::make_unique<CanvasDrawingArea>();
+    drawing_area->setBackgroundColor(Theme::getBackgroundPrimary());
+    drawing_area->setMargin(1);
+    mDrawingArea = drawing_area.get();
+
+    auto control_draw_vspacer = VerticalSpacer::Create();
+    control_draw_vspacer->addWidgetWithScale(std::move(controls), 1);
+    control_draw_vspacer->addWidgetWithScale(std::move(drawing_area), 10);
 
     auto hSpacer = HorizontalSpacer::Create();
     hSpacer->addWidgetWithScale(std::move(label), 1);
-    //hSpacer->addWidgetWithScale(std::move(textBox), 14);
+
+    hSpacer->addWidgetWithScale(std::move(control_draw_vspacer), 10);
 
     auto cache_button_spacer = initializeCacheButtons();
     hSpacer->addWidgetWithScale(std::move(cache_button_spacer), 1);
@@ -48,6 +66,11 @@ void CanvasView::initialize()
     addWidget(std::move(hSpacer));
 }
 
+void CanvasView::onDrawCommandChanged(CanvasDrawCommand command)
+{
+    mDrawingArea->setActiveDrawingCommand(command);
+}
+
 std::unique_ptr<Widget> CanvasView::initializeCacheButtons()
 {
     auto saveButton = Button::Create();
@@ -66,10 +89,9 @@ std::unique_ptr<Widget> CanvasView::initializeCacheButtons()
     loadButton->setMargin(2);
 
     auto buttonSpacer = VerticalSpacer::Create();
-    buttonSpacer->AddWidgetWithScale(std::move(saveButton), 1);
+    buttonSpacer->addWidgetWithScale(std::move(saveButton), 1);
-    buttonSpacer->AddWidgetWithScale(std::move(clearButton), 1);
+    buttonSpacer->addWidgetWithScale(std::move(clearButton), 1);
-    buttonSpacer->AddWidgetWithScale(std::move(loadButton), 1);
+    buttonSpacer->addWidgetWithScale(std::move(loadButton), 1);
-
     return buttonSpacer;
 }
 

apps/notes_tk/canvas/CanvasView.h

@@ -1,8 +1,10 @@
 #pragma once
 
 #include "Widget.h"
+#include "CanvasElements.h"
 
 class CanvasController;
+class CanvasDrawingArea;
 
 class CanvasView : public Widget
 {
@@ -14,13 +16,14 @@ public:
     static std::unique_ptr<CanvasView> Create();
 
 private:
+    void onDrawCommandChanged(CanvasDrawCommand command);
 
     void initialize();
 
     std::unique_ptr<Widget> initializeCacheButtons();
 
-    //std::unique_ptr<Widget> initializeCacheButtons();
-
     std::unique_ptr<CanvasController> mController;
+
+    CanvasDrawingArea* mDrawingArea{nullptr};
 };
 using CanvasViewPtr = std::unique_ptr<CanvasView>;

apps/notes_tk/text_editor/TextEditorView.cpp

@@ -72,9 +72,9 @@ void TextEditorView::initialize()
     loadButton->setOnClickFunction(onLoad);
 
     auto buttonSpacer = VerticalSpacer::Create();
-    buttonSpacer->AddWidgetWithScale(std::move(saveButton), 1);
+    buttonSpacer->addWidgetWithScale(std::move(saveButton), 1);
-    buttonSpacer->AddWidgetWithScale(std::move(clearButton), 1);
+    buttonSpacer->addWidgetWithScale(std::move(clearButton), 1);
-    buttonSpacer->AddWidgetWithScale(std::move(loadButton), 1);
+    buttonSpacer->addWidgetWithScale(std::move(loadButton), 1);
 
     auto hSpacer = HorizontalSpacer::Create();
     hSpacer->addWidgetWithScale(std::move(label), 1);

apps/notes_tk/text_editor/TextEditorView.h

@@ -11,7 +11,6 @@
 class TextEditorView : public Widget
 {
 public:
-
     TextEditorView();
 
     static std::unique_ptr<TextEditorView> Create();

src/client/TabbedPanelWidget.cpp

@@ -17,8 +17,8 @@ TabbedPanelWidget::TabbedPanelWidget()
     nav->setSize({0, 0, 0, 0, 200, 0});
 
     auto vertSpacer = VerticalSpacer::Create();
-    vertSpacer->AddWidgetWithScale(std::move(nav), 1);
+    vertSpacer->addWidgetWithScale(std::move(nav), 1);
-    vertSpacer->AddWidgetWithScale(std::move(stack), 4);
+    vertSpacer->addWidgetWithScale(std::move(stack), 4);
     addWidget(std::move(vertSpacer));
 }
 

src/graphics/opengl/OpenGlMeshPainter.cpp

@@ -110,6 +110,7 @@ void OpenGlMeshPainter::paint(SceneModel* model, DrawingContext* context)
             auto y = vertices[idx]*transform.getScaleY() + transform.getLocation().getY();
             vertices[idx] = 1.0 - 2*y/height;
         }
+
     }
 
     std::vector<unsigned> indices;

src/mesh/MeshPrimitives.cpp

@@ -32,6 +32,74 @@ std::unique_ptr<TriMesh> MeshPrimitives::buildRectangleAsTriMesh()
     return MeshBuilder::buildTriMesh(locations, edge_ids, face_ids);
 }
 
+std::unique_ptr<TriMesh> MeshPrimitives::buildCircleAsTriMesh(unsigned numSegments)
+{
+    VecPoints locations(numSegments + 1);
+    locations[0] = {0, 0};
+
+    const double delta_theta = (2.0*M_PI)/double(numSegments);
+    double theta = 0.0;
+    for(unsigned idx=1; idx<=numSegments; idx++)
+    {
+        const double x = sin(theta);
+        const double y = cos(theta);
+        locations[idx] = {x, y};
+        theta += delta_theta;
+    }
+
+    EdgeIds edge_ids(2*numSegments);
+    for(unsigned idx=0; idx<numSegments; idx++)
+    {
+        edge_ids[idx] = {0, idx+1};
+
+        auto wrap_node = idx + 2;
+        if (wrap_node > numSegments)
+        {
+            wrap_node = 1;
+        }
+        edge_ids[idx + numSegments] = {idx + 1, wrap_node};
+    }
+
+    FaceIds face_ids(numSegments);
+    for(unsigned idx=0; idx<numSegments; idx++)
+    {
+        auto top_edge_inner = idx + 1;
+        if (top_edge_inner == numSegments)
+        {
+            top_edge_inner = 0;
+        }
+
+        const auto outer_edge = idx + numSegments;
+        face_ids[idx] = {idx, outer_edge, top_edge_inner};
+    }
+    return MeshBuilder::buildTriMesh(locations, edge_ids, face_ids);
+}
+
+std::unique_ptr<LineMesh> MeshPrimitives::buildCircleAsLineMesh(unsigned numSegments)
+{
+    VecPoints locations(numSegments);
+    const double delta_theta = (2.0*M_PI)/double(numSegments);
+    double theta = 0.0;
+    for(unsigned idx=0; idx<numSegments; idx++)
+    {
+        const double x = sin(theta);
+        const double y = cos(theta);
+        locations[idx] = {x, y};
+    }
+
+    EdgeIds edge_ids(2*numSegments);
+    for(unsigned idx=0; idx<numSegments; idx++)
+    {
+        auto top_node = idx + 1;
+        if (top_node == numSegments)
+        {
+            top_node = 0;
+        }
+        edge_ids[idx] = {idx, top_node};
+    }
+    return MeshBuilder::buildLineMesh(locations, edge_ids);
+}
+
 std::unique_ptr<TriMesh> MeshPrimitives::buildRoundedRectangleAsTriMesh(double radius, double aspect_ratio, unsigned num_segments)
 {
     unsigned num_fans = 4;

src/mesh/MeshPrimitives.h

@@ -6,6 +6,9 @@
 class MeshPrimitives
 {
 public:
+    static std::unique_ptr<TriMesh> buildCircleAsTriMesh(unsigned numSegments = 24);
+
+    static std::unique_ptr<LineMesh> buildCircleAsLineMesh(unsigned numSegments = 24);
 
     static std::unique_ptr<TriMesh> buildRectangleAsTriMesh();
 

src/ui_elements/widgets/VerticalSpacer.cpp

@@ -17,10 +17,10 @@ std::unique_ptr<VerticalSpacer> VerticalSpacer::Create()
 
 void VerticalSpacer::addWidget(WidgetUPtr widget)
 {
-    AddWidgetWithScale(std::move(widget), 1.0);
+    addWidgetWithScale(std::move(widget), 1.0);
 }
 
-void VerticalSpacer::AddWidgetWithScale(WidgetUPtr widget, double scale)
+void VerticalSpacer::addWidgetWithScale(WidgetUPtr widget, double scale)
 {
     Widget::addWidget(std::move(widget));
     mScales.push_back(scale);

src/ui_elements/widgets/VerticalSpacer.h

@@ -12,7 +12,7 @@ public:
 
     void addWidget(WidgetUPtr widget) override;
 
-    void AddWidgetWithScale(WidgetUPtr widget, double scale);
+    void addWidgetWithScale(WidgetUPtr widget, double scale);
 
 private:
     void updateChildLocations() override;

src/visual_elements/CMakeLists.txt

@@ -1,6 +1,8 @@
 list(APPEND visual_elements_LIB_INCLUDES
     GeometryNode.cpp
-    RectangleNode.cpp
+    basic_shapes/RectangleNode.cpp
+    basic_shapes/CircleNode.cpp
+    basic_shapes/LineNode.cpp
     MaterialNode.cpp
     MeshNode.cpp
     TextNode.cpp
@@ -17,7 +19,8 @@ list(APPEND visual_elements_LIB_INCLUDES
 add_library(visual_elements SHARED ${visual_elements_LIB_INCLUDES})
 
 target_include_directories(visual_elements PUBLIC
-                          "${CMAKE_CURRENT_SOURCE_DIR}"
+                          ${CMAKE_CURRENT_SOURCE_DIR}
+                          ${CMAKE_CURRENT_SOURCE_DIR}/basic_shapes
                           )
 
 target_link_libraries(visual_elements PUBLIC core geometry fonts mesh image)

src/visual_elements/GeometryNode.h

@@ -10,7 +10,9 @@ public:
         Path,
         Rectangle,
         Circle,
-        Arc
+        Arc,
+        Line,
+        Polyline
     };
 
 public:
@@ -29,4 +31,19 @@ protected:
     bool mGeometryIsDirty{true};
 };
 
+class LineNode : public GeometryNode
+{
+public:
+    LineNode(const DiscretePoint& location)
+    :    GeometryNode(location)
+    {
+
+    }
+
+    Type getType()
+    {
+        return Type::Line;
+    }
+};
+
 using GeometryNodePtr = std::unique_ptr<GeometryNode>;

src/visual_elements/basic_shapes/CircleNode.cpp

@@ -0,0 +1,83 @@
+#include "CircleNode.h"
+
+#include "FontsManager.h"
+#include "SceneModel.h"
+#include "AbstractMesh.h"
+#include "MeshPrimitives.h"
+
+#include <iostream>
+
+CircleNode::CircleNode(const DiscretePoint& location, unsigned radius)
+:    GeometryNode(location),
+     mRadius(radius)
+{
+
+}
+
+CircleNode::Type CircleNode::getType()
+{
+    return Type::Circle;
+}
+
+unsigned CircleNode::getRadius() const
+{
+    return mRadius;
+}
+
+SceneItem* CircleNode::getSceneItem(std::size_t idx) const
+{
+    if (idx == 0)
+    {
+        return mBackgroundItem.get();
+    }
+    else
+    {
+        return nullptr;
+    }
+}
+
+unsigned CircleNode::getNumSceneItems() const
+{
+    return 1;
+}
+
+void CircleNode::setRadius(unsigned radius)
+{
+    if (mRadius != radius)
+    {
+        mRadius = radius;
+        mTransformIsDirty = true;
+    }
+
+}
+
+void CircleNode::update(FontsManager* fontsManager)
+{
+    if (!mBackgroundItem || mGeometryIsDirty)
+    {
+        auto mesh = MeshPrimitives::buildCircleAsTriMesh();
+
+        if (!mBackgroundItem)
+        {
+            mBackgroundItem = std::make_unique<SceneModel>(std::move(mesh));
+            mBackgroundItem->setName(mName + "_Model");
+        }
+        else
+        {
+            mBackgroundItem->updateMesh(std::move(mesh));
+        }
+        mGeometryIsDirty = false;
+    }
+
+    if (mTransformIsDirty)
+    {
+        mBackgroundItem->updateTransform({mLocation, static_cast<double>(2*mRadius), static_cast<double>(2*mRadius)});
+        mTransformIsDirty = false;
+    }
+
+    if (mMaterialIsDirty)
+    {
+        mBackgroundItem->updateUniformColor(mFillColor);
+        mMaterialIsDirty = false;
+    }
+}

src/visual_elements/basic_shapes/CircleNode.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "GeometryNode.h"
+
+class CircleNode : public GeometryNode
+{
+public:
+    CircleNode(const DiscretePoint& location, unsigned radius);
+
+    Type getType();
+
+    unsigned getRadius() const;
+
+    SceneItem* getSceneItem(std::size_t idx) const override;
+    unsigned getNumSceneItems() const override;
+
+    void setRadius(unsigned radius);
+
+    void update(FontsManager* fontsManager) override;
+private:
+    unsigned mRadius{1};
+
+    std::unique_ptr<SceneModel> mBackgroundItem;
+    std::unique_ptr<SceneModel> mOutlineItem;
+};

src/visual_elements/basic_shapes/RectangleNode.h

@@ -1,9 +1,8 @@
 #pragma once
 
-#include <memory>
-
 #include "GeometryNode.h"
-#include "DiscretePoint.h"
+
+#include <memory>
 
 class RectangleNode : public GeometryNode
 {