Toying with alignment API.

src/dawn/component/ui/UICanvas.cpp

@@ -59,15 +59,23 @@ struct RenderPassContext &ctx
   quadCount = 0;
   nextBinding = 0;
 
+  // Define the root alignment
+  struct UIAlign rootAlignment = {
+    glm::vec2(0, 0),
+    glm::vec2(1280, 720)
+  };
+
+  // Get the quads for each component
   auto itComponents = components.begin();
   auto self = std::ref(*this);
   while(itComponents != components.end()) {
     auto component = *itComponents;
-    component->getQuads({ 0, 0 }, self);
+    component->getQuads(rootAlignment, self);
     ++itComponents;
   }
-  flushPass();
 
+  // Flush the remaining quads
+  flushPass();
   return passes;
 }
 

src/dawn/ui/UIComponent.cpp

@@ -11,12 +11,22 @@ std::vector<std::shared_ptr<UIComponent>> UIComponent::getChildren() {
   return {};
 }
 
-void UIComponent::getQuads(const glm::vec2 parent, UICanvas &ctx) {
-  glm::vec2 transform = parent + position;
-  this->getSelfQuads(transform, ctx);
+void UIComponent::getQuads(
+  const struct UIAlign alignment,
+  UICanvas &ctx
+) {
+  auto selfAlignment = getSelfAlignment(alignment);
+  this->getSelfQuads(selfAlignment, ctx);
 
   auto children = getChildren();
   for(auto &c : children) {
-    c->getQuads(transform, ctx);
+    c->getQuads(selfAlignment, ctx);
   }
+}
+
+struct UIAlign UIComponent::getSelfAlignment(const struct UIAlign alignment) {
+  return (struct UIAlign){
+    alignment.position + position,
+    alignment.size
+  };
 }

src/dawn/ui/UIComponent.hpp

@@ -4,21 +4,39 @@
 // https://opensource.org/licenses/MIT
 
 #pragma once
-#include "ui/UIAlign.hpp"
 #include "display/shader/UIShader.hpp"
 #include "component/ui/UICanvas.hpp"
 
 namespace Dawn {
+  struct UIAlign {
+    glm::vec2 position;
+    glm::vec2 size;
+  };
+
   class UIComponent {
     protected:
       /**
        * Virtual method overridden by the UIComponent to get the quads for the
        * component.
        * 
-       * @param t The translation of this component already applied.
+       * @param alignment The alignment of this component.
        * @param ctx The canvas to add the quads to.
        */
-      virtual void getSelfQuads(const glm::vec2 t, UICanvas &ctx) = 0;
+      virtual void getSelfQuads(
+        const struct UIAlign alignment,
+        UICanvas &ctx
+      ) = 0;
+
+      /**
+       * Allows a component to modify its self alignment.
+       * 
+       * @param alignment Aliugnment to modify.
+       * @return New alignment for this component.
+       */
+      virtual struct UIAlign getSelfAlignment(const struct UIAlign alignment);
+
+    public:
+      glm::vec2 position;
 
       /**
        * Virtual method overridden by the UIComponent to get the children of
@@ -29,14 +47,12 @@ namespace Dawn {
       /**
        * Method called by the UICanvas to get the quads for this component.
        * 
-       * @param parent The parent translation to apply to the component.
+       * @param alignment The alignment of this component.
        * @param ctx The canvas to add the quads to.
        */
-      void getQuads(const glm::vec2 parent, UICanvas &ctx);
-
-    public:
-      glm::vec2 position;
-
-      friend class UICanvas;
+      void getQuads(
+        const struct UIAlign alignment,
+        UICanvas &ctx
+      );
   };
 }

src/dawn/ui/UILabel.cpp

@@ -7,21 +7,24 @@
 
 using namespace Dawn;
 
-void UILabel::getSelfQuads(const glm::vec2 t, UICanvas &ctx) {
+void UILabel::getSelfQuads(
+  const struct UIAlign alignment,
+  UICanvas &ctx
+) {
   std::vector<struct UIShaderQuad> quads;
   if(this->texture == nullptr || this->text.empty()) return;
 
-  glm::vec2 position = t;
   glm::vec4 quad;
+  glm::vec2 pos = alignment.position;
 
   for(wchar_t c : text) {
     auto info = texture->getCharacterData(c);
     ctx.addQuad(
       {
-        position.x + info.offset.x,
-        position.y + info.offset.y,
-        position.x + info.size.x + info.offset.x,
-        position.y + info.size.y + info.offset.y
+        pos.x + info.offset.x,
+        pos.y + info.offset.y,
+        pos.x + info.size.x + info.offset.x,
+        pos.y + info.size.y + info.offset.y
       },
       {
         info.quad.x,
@@ -33,7 +36,7 @@ void UILabel::getSelfQuads(const glm::vec2 t, UICanvas &ctx) {
       UIShaderQuadStyle::FONT,
       texture->texture
     );
-    position += info.advance;
+    pos += info.advance;
   }
 }
 

src/dawn/ui/UILabel.hpp

@@ -14,7 +14,10 @@ namespace Dawn {
       std::wstring text = L"Hello World";
 
     protected:
-      void getSelfQuads(const glm::vec2 t, UICanvas &ctx) override;
+      void getSelfQuads(
+        const struct UIAlign alignment,
+        UICanvas &ctx
+      ) override;
 
     public:
       /**

src/dawn/ui/UIRectangle.cpp

@@ -7,10 +7,13 @@
 
 using namespace Dawn;
 
-void UIRectangle::getSelfQuads(const glm::vec2 t, UICanvas &ctx) {
+void UIRectangle::getSelfQuads(
+  const struct UIAlign alignment,
+  UICanvas &ctx
+) {
   std::vector<struct UIShaderQuad> quads;
   ctx.addQuad(
-    glm::vec4(t, t + size),
+    glm::vec4(alignment.position, alignment.position + size),
     uv,
     color,
     UIShaderQuadStyle::TEXTURED,

src/dawn/ui/UIRectangle.hpp

@@ -9,7 +9,10 @@
 namespace Dawn {
   class UIRectangle final : public UIComponent {
     protected:
-      void getSelfQuads(const glm::vec2 t, UICanvas &ctx) override;
+      void getSelfQuads(
+        const struct UIAlign alignment,
+        UICanvas &ctx
+      ) override;
 
     public:
       struct Color color = COLOR_WHITE;