fix brush projection to eliminate seams, still problems with big brushes and need to implement erase

engine/node.cpp

@@ -478,30 +478,6 @@ glm::vec2 Node::GetSize()
     return{ GetWidth(), GetHeight() };
 }
 
-glm::vec4 Node::rect_intersection(glm::vec4 a, glm::vec4 b) const
-{
-    // convert from [x,y,w,h] to [x1,y1,x2,y1]
-    a = glm::vec4(a.xy(), a.xy() + a.zw());
-    b = glm::vec4(b.xy(), b.xy() + b.zw());
-    // compute intersection
-    auto o = glm::vec4(glm::max(a.xy(), b.xy()), glm::min(a.zw(), b.zw()));
-    // back to rect form
-    o = glm::vec4(o.xy(), glm::max({ 0, 0 }, o.zw() - o.xy()));
-    return o;
-}
-
-glm::vec4 Node::rect_union(glm::vec4 a, glm::vec4 b) const
-{
-    // convert from rect [x,y,w,h] to bb [x1,y1,x2,y1]
-    a = glm::vec4(a.xy(), a.xy() + a.zw());
-    b = glm::vec4(b.xy(), b.xy() + b.zw());
-    // compute union
-    glm::vec4 o = { glm::min(a.xy(), b.xy()), glm::max(a.zw(), b.zw()) };
-    // back to rect form
-    o = glm::vec4(o.xy(), glm::max({ 0, 0 }, o.zw() - o.xy()));
-    return o;
-}
-
 void Node::restore_context()
 {
     for (auto& c : m_children)