Clean up some rendering.

src/publishing/plotting/EquationNode.cpp

@@ -2,6 +2,7 @@
 
 #include "LatexMathExpression.h"
 #include "TextNode.h"
+#include "LineNode.h"
 
 #include "FileLogger.h"
 
@@ -31,31 +32,37 @@ void EquationNode::update(SceneInfo* sceneInfo)
     }
 }
 
-void EquationNode::addExpression(const LatexMathExpression* expression)
+void EquationNode::addExpression(SceneInfo* sceneInfo, 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())
+        for (const auto& child : expression->getExpressions())
         {
-            addExpression(expression.get());
+            addExpression(sceneInfo, child.get());
         }
     }
     else if(expression->getType() == LatexMathExpression::Type::LEAF)
     {
-        std::string content = "_";
+        std::string content;
         for (const auto& symbol : expression->getSymbols())
         {
             content += symbol.mUnicode;
         }
-        MLOG_INFO("Processing leaf expr with content: " << content);
+
+        if (content.empty())
+        {
+            return;
+        }
+
+        MLOG_INFO("Processing leaf expr with content: " << content << " and size " << content.size());
         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);
+        mTextCursor.move(node->getContentWidth(sceneInfo), 0.0);
+
+        mText.push_back(std::move(node));  
     }
     else if (expression->getType() == LatexMathExpression::Type::FRACTION)
     {
@@ -63,13 +70,19 @@ void EquationNode::addExpression(const LatexMathExpression* expression)
         if (expression->getExpressions().size() == 2)
         {
             auto x_cache = mTextCursor.getX();
-            mTextCursor.move(0.0, -10.0);
-            addExpression(expression->getExpressions()[0].get());
+            mTextCursor.move(0.0, -9.0);
+            addExpression(sceneInfo, expression->getExpressions()[0].get());
 
-            mTextCursor.move(mTextCursor.getX() - x_cache, 20.0);
-            addExpression(expression->getExpressions()[1].get());
+            mTextCursor.move(x_cache - mTextCursor.getX(), 16.0);
+            std::vector<Point> end_loc{ { 25.0, 0.0 } };
+            auto dividing_line = std::make_unique<LineNode>(Transform(mTextCursor), end_loc);
+            addChild(dividing_line.get());
+            mLines.push_back(std::move(dividing_line));
 
-            mTextCursor.move(0.0, -10.0);
+            mTextCursor.move(0.0, 2.0);
+            addExpression(sceneInfo, expression->getExpressions()[1].get());
+
+            mTextCursor.move(0.0, -9.0);
         }
     }
 }
@@ -79,5 +92,5 @@ void EquationNode::createOrUpdateGeometry(SceneInfo* sceneInfo)
     mChildren.clear();
     mText.clear();
 
-    addExpression(mContent);
+    addExpression(sceneInfo, mContent);
 }

src/publishing/plotting/EquationNode.h

@@ -4,6 +4,7 @@
 #include "FontItem.h"
 
 class TextNode;
+class LineNode;
 class LatexMathExpression;
 
 class EquationNode : public AbstractVisualNode
@@ -20,10 +21,11 @@ public:
 protected:
 	void createOrUpdateGeometry(SceneInfo* sceneInfo);
 
-	void addExpression(const LatexMathExpression* expression);
+	void addExpression(SceneInfo* sceneInfo, const LatexMathExpression* expression);
 
 
 	std::vector<std::unique_ptr<TextNode> > mText;
+	std::vector<std::unique_ptr<LineNode> > mLines;
 
 	FontItem mDefaultFont{ "Cambria Math", 14 };
 	//FontItem mDefaultFont{ "Latin Modern Math", 14 };

src/rendering/fonts/directx/DirectWriteFontEngine.cpp

@@ -158,7 +158,7 @@ double DirectWriteFontEngine::getHorizontalAdvance(const FontItem& fontItem, con
             {
                 const auto design_width = metrics[idx].advanceWidth;
                 // https://learn.microsoft.com/en-us/windows/win32/gdi/device-vs--design-units
-                double device_width = (design_width / static_cast<double>(design_per_em)) * (fontItem.getSize() / 72.0) * 96.0 * 0.75;
+                double device_width = (design_width / static_cast<double>(design_per_em)) * (fontItem.getSize() / 72.0) * 96.0 * 0.8;
 
                 MLOG_INFO("Got advance width: " << device_width);
                 //total_advance += std::floor(device_width);

src/rendering/visual_elements/nodes/TextNode.cpp

@@ -54,6 +54,24 @@ double TextNode::getHeight() const
     return mHeight;
 }
 
+double TextNode::getContentWidth(SceneInfo* sceneInfo)
+{
+    if (mContentWidth == 1.0)
+    {
+        mContentWidth = sceneInfo->mFontsManager->getFontEngine()->getHorizontalAdvance(mTextData.mFont, mTextData.mContent);
+    }
+    return mContentWidth;
+}
+
+double TextNode::getContentHeight(SceneInfo* sceneInfo)
+{
+    if (mContentHeight == 1.0)
+    {
+        mContentHeight = mTextData.mFont.getSize();
+    }
+    return mContentHeight;
+}
+
 void TextNode::setWidth(double width)
 {
     if (mWidth != width)
@@ -190,8 +208,8 @@ void TextNode::update(SceneInfo* sceneInfo)
         mTextItem = std::make_unique<SceneText>();
         mTextItem->setName(mName + "_SceneText");
 
-        mContentWidth = sceneInfo->mFontsManager->getFontEngine()->getHorizontalAdvance(mTextData.mFont, mTextData.mContent);
-        mContentHeight = mTextData.mFont.getSize();
+        getContentWidth(sceneInfo);
+        getContentHeight(sceneInfo);
 
         if (mWidth == 1.0 && mHeight == 1.0)
         {

src/rendering/visual_elements/nodes/TextNode.h

@@ -31,6 +31,9 @@ public:
     double getWidth() const;
     double getHeight() const;
 
+    double getContentWidth(SceneInfo* sceneInfo);
+    double getContentHeight(SceneInfo* sceneInfo);
+
     void setWidth(double width);
     void setHeight(double height);
 

test/publishing/TestLatexConverter.cpp

@@ -10,7 +10,7 @@
 
 TEST_CASE(TestLatexConverter, "publishing")
 {
-	auto expression = std::make_unique<LatexMathExpression>("\\psi = \\frac{\\alpha + \\beta}{c}");
+	auto expression = std::make_unique<LatexMathExpression>("\\psi = \\frac{\\alpha + \\beta}{c + d} + e");
 
 	auto equation_node = std::make_unique<EquationNode>(Point(10, 10));
 	equation_node->setContent(expression.get());