draws wonky line

libs/mare/mare_drawables.cpp

@@ -5,7 +5,11 @@ namespace Render {
     Drawable::Drawable(const size_t id, Drawable* parent, Mare* engine):
     _id(id),
     _parent(parent),
-    _engine(engine)
+    _engine(engine),
+    _origin({0,0}),
+    _bbox({0,0,0,0}),
+    _blendMode(Render::BlendMode::Intersect),
+    _dirty(false)
     {
     }
 
@@ -28,23 +32,58 @@ namespace Render {
 
     void DrawablePoint::render() {
         uint8_t *buf;
-        if (parent() == nullptr)
-            buf = engine()->bBuffer();
-        else 
-            buf = engine()->fBuffer();
-        //TODO: implement screen rotation and margin check
-        auto dx = engine()->getSize().x;
-        for (uint16_t xx(0); xx< _size.x; xx++){
-            for (uint16_t yy(0); yy < _size.y; yy++)
-            {
-                engine()->setPixel(buf,dx-(getOrigin().x+xx),getOrigin().y+yy,true);
-            }  
+        if (isDirty()){
+            buf = getBuffer();
+            //TODO: implement screen rotation and margin check
+            auto dx = engine()->getSize().x;
+            auto dy = engine()->getSize().y;
+            for (uint16_t xx(0); xx< _size.x; xx++){
+                for (uint16_t yy(0); yy < _size.y; yy++)
+                {
+                    engine()->setPixel(buf,dx-(getOrigin().x+xx),getOrigin().y+yy,true);
+                }  
+            }
+            resetDirty();
         }
     }
 
 
     //--------+--------+--------+--------+--------+--------+--------+--------+--------+--------//
     //Line
+    DrawableLine::DrawableLine(const size_t id, Drawable* parent, Mare* engine):
+        Drawable(id, parent,engine),
+        _thickness(1),
+        _lenght(0),
+        _rotation(0.0f)
+    {
+
+    }
+
+    DrawableLine::~DrawableLine(){
+
+    }
+
+    void DrawableLine::render(){
+        uint8_t* buf;
+        if (isDirty()) {
+            buf = getBuffer();
+            float cx,sx;
+            auto dx = engine()->getSize().x;
+            auto dy = engine()->getSize().y;
+            sincosf(_rotation,&sx,&cx); // use optimized float instructions
+            uint16_t endX = round(cx*(float)_lenght);
+            for(uint16_t yy(0); yy <= _thickness; ++yy){
+                for(uint16_t xx(0); xx <= endX; ++xx){
+                    float dydx = cx == 0.0f ? 0 : (sx/cx);
+                    float dxdy = sx == 0.0f ? 0 : (cx/sx);
+                    uint16_t y = getOrigin().y+yy+xx*dydx;
+                    uint16_t x = dx-(getOrigin().x+xx+yy);
+                    engine()->setPixel(buf,x,y,true);
+                }
+            }
+            resetDirty();
+        }
+    }
 
     //--------+--------+--------+--------+--------+--------+--------+--------+--------+--------//
     //Rectangle