Add initial font metrics and equation rendering.

src/publishing/plotting/EquationNode.cpp

@@ -1,7 +1,83 @@
 #include "EquationNode.h"
 
+#include "LatexMathExpression.h"
+#include "TextNode.h"
+
+#include "FileLogger.h"
+
 EquationNode::EquationNode(const Transform& t)
 	: AbstractVisualNode(t)
 {
 
+}
+
+EquationNode::~EquationNode()
+{
+
+}
+
+void EquationNode::setContent(LatexMathExpression* content)
+{
+	mContent = content;
+	mContentDirty = true;
+}
+
+void EquationNode::update(SceneInfo* sceneInfo)
+{
+    if (mContentDirty)
+    {
+        createOrUpdateGeometry(sceneInfo);
+        mContentDirty = false;
+    }
+}
+
+void EquationNode::addExpression(const LatexMathExpression* expression)
+{
+    if (expression->getType() == LatexMathExpression::Type::LINEAR)
+    {
+        MLOG_INFO("Processing linear expr with : " << expression->getExpressions().size() << " children");
+        for (const auto& expression : expression->getExpressions())
+        {
+            addExpression(expression.get());
+        }
+    }
+    else if(expression->getType() == LatexMathExpression::Type::LEAF)
+    {
+        std::string content = "_";
+        for (const auto& symbol : expression->getSymbols())
+        {
+            content += symbol.mUnicode;
+        }
+        MLOG_INFO("Processing leaf expr with content: " << content);
+        auto node = std::make_unique<TextNode>(content, Transform(mTextCursor));
+        node->setWidth(100);
+        node->setFont(mDefaultFont);
+        addChild(node.get());
+        mText.push_back(std::move(node));
+
+        mTextCursor.move(20.0, 0.0);
+    }
+    else if (expression->getType() == LatexMathExpression::Type::FRACTION)
+    {
+        MLOG_INFO("Processing frac expr");
+        if (expression->getExpressions().size() == 2)
+        {
+            auto x_cache = mTextCursor.getX();
+            mTextCursor.move(0.0, -10.0);
+            addExpression(expression->getExpressions()[0].get());
+
+            mTextCursor.move(mTextCursor.getX() - x_cache, 20.0);
+            addExpression(expression->getExpressions()[1].get());
+
+            mTextCursor.move(0.0, -10.0);
+        }
+    }
+}
+
+void EquationNode::createOrUpdateGeometry(SceneInfo* sceneInfo)
+{
+    mChildren.clear();
+    mText.clear();
+
+    addExpression(mContent);
 }