Implement Font::MeasureString (TODO: double check!!)

main.cpp

@@ -4,6 +4,7 @@
 #include <JGL/Colors.h>
 #include <J3ML/LinearAlgebra/Vector2.h>
 #include <JGL/Font.h>
+#include "jlog/jlog.hpp"
 
 using J3ML::LinearAlgebra::Vector2;
 using namespace JGL;
@@ -119,6 +120,9 @@ public:
             J2D::OutlineTriangle(Colors::Blue, {{100, 275}, {0, 275}, {100, 375}});
             J2D::DrawGradientLine(JGL::Colors::Red, JGL::Colors::Blue, {105, 375}, {200, 275}, 2);
 
+            auto result = Jupiteroid->MeasureString("Jupiteroid Font", 16);
+            DEBUG(std::format("Result: {},{}", result.x, result.y ));
+
             J2D::DrawString(JGL::Colors::Green, "Jupteroid Font", 0.f, 16, 1.f, 16, *Jupiteroid);
             J2D::DrawString(JGL::Colors::White, "Position: " + std::to_string(camera->position.x) + " " + std::to_string(camera->position.y) + " " + std::to_string(camera->position.z), 0, 33, 1,16, *Jupiteroid);
             J2D::DrawString(JGL::Colors::White, "ViewAngle: " + std::to_string(camera->angle.x) + " " + std::to_string(camera->angle.y) + " " + std::to_string(camera->angle.z), 0, 50, 1,16, *Jupiteroid);

src/JGL/Font.cpp

@@ -112,4 +112,43 @@ namespace JGL
     {
         return Font(path);
     }
+
+    Vector2 Font::MeasureString(const std::string &text, float ptSize) {
+
+        // TODO: Work in-progress implementation unfortunately.
+        // This is likely returning slightly incorrect results for likely several reasons.
+        // Half-ass solution for now ~ dawsh.
+
+        FT_BBox glyph_bbox;
+
+        Vector2 extents = Vector2(0,0);
+
+        for (const char& c : text)
+        {
+
+            FT_GlyphSlot slot = face->glyph;
+            auto glyph_index = FT_Get_Char_Index(this->face, c);
+
+            auto error = FT_Load_Glyph(face, glyph_index, FT_LOAD_DEFAULT);
+            if (error)
+                continue;
+
+
+
+
+            Vector2 advance = {static_cast<float>(slot->advance.x >> 6),
+                               static_cast<float>(slot->advance.y >> 6)};
+
+            extents += advance;
+        }
+
+        if (extents.y == 0)
+        {
+            extents.y = face->bbox.yMax / 64;
+        }
+
+        return extents;
+    }
+
+
 }