From d0ee939a32fc7cec65a77d028d72881ee8ea1495 Mon Sep 17 00:00:00 2001
From: Ekaitz Zarraga <ekaitz@elenq.tech>
Date: Sat, 10 Dec 2022 20:42:27 +0100
Subject: Move font support and clean

---
 src/graphics/textureFont.cpp | 85 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 src/graphics/textureFont.cpp

(limited to 'src/graphics/textureFont.cpp')

diff --git a/src/graphics/textureFont.cpp b/src/graphics/textureFont.cpp
new file mode 100644
index 0000000..a95c71c
--- /dev/null
+++ b/src/graphics/textureFont.cpp
@@ -0,0 +1,85 @@
+#include "textureFont.h"
+
+using namespace Graphics;
+
+// TextureFont
+
+TextureFont::TextureFont(const sf::Texture &texture,
+        TextureFont::Descr description)
+    : tex_(texture)
+    , description_(description)
+{
+    sf::Vector2u totalSize = tex_.getSize();
+    sf::Vector2f totalSize_f (totalSize.x, totalSize.y);
+    glyphSize_ = sf::Vector2f( totalSize.x / description_.numcols,
+                               totalSize.y / description_.numrows );
+}
+
+std::array<sf::Vector2f, 4> TextureFont::getGlyphMapping(const char ch){
+    unsigned int pos = static_cast<unsigned int>( description_.mapping.find_first_of(ch));
+    if (pos == std::string::npos){
+        // TODO: Error handling!
+        pos = 0;
+    }
+    unsigned int x = pos % description_.numcols;
+    unsigned int y = (pos - x) / description_.numcols;
+
+    sf::Vector2f basePos(x*glyphSize_.x, y*glyphSize_.y);
+
+    // 1 --- 2
+    // |     |
+    // 4 --- 3
+    return std::array<sf::Vector2f,4> {
+        basePos,
+        basePos + sf::Vector2f( glyphSize_.x, 0 ),
+        basePos + glyphSize_,
+        basePos + sf::Vector2f( 0, glyphSize_.y ),
+    };
+}
+
+sf::Vector2f TextureFont::getGlyphSize(){
+    return glyphSize_;
+}
+
+const sf::Texture * TextureFont::getTexture(){
+    return &tex_;
+}
+
+
+
+
+// Text
+
+Text::Text(TextureFont &font, const std::string &text)
+    : font_(font)
+    , text_(text)
+    , vertices_(sf::Quads, text.size()*4)
+{
+    unsigned int length = vertices_.getVertexCount();
+    sf::Vector2f glyphSize = font_.getGlyphSize();
+    // TODO: this is the simplest rendering way: everything in one line
+    //       we should improve this to make it handle newlines or max witdths
+    for(unsigned int i=0; i < length; i=i+4){
+        vertices_[i+0].position = sf::Vector2f(glyphSize.x * i/4,       0);
+        vertices_[i+1].position = sf::Vector2f(glyphSize.x * (i/4 + 1), 0);
+        vertices_[i+2].position = sf::Vector2f(glyphSize.x * (i/4 + 1), glyphSize.y);
+        vertices_[i+3].position = sf::Vector2f(glyphSize.x * i/4,       glyphSize.y);
+
+        std::array<sf::Vector2f, 4> glyph = font_.getGlyphMapping(text_[i/4]);
+
+        vertices_[i+0].texCoords = glyph[0];
+        vertices_[i+1].texCoords = glyph[1];
+        vertices_[i+2].texCoords = glyph[2];
+        vertices_[i+3].texCoords = glyph[3];
+    }
+}
+
+void Text::draw(sf::RenderTarget& target, sf::RenderStates states) const
+{
+    // TODO: only repaint if needed: when repainting is needed
+    // vertices_.clear() and fun
+    states.transform *= getTransform();
+    states.texture = font_.getTexture();
+    // you may also override states.shader or states.blendMode if you want
+    target.draw(vertices_, states);
+}
-- 
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