Dragging/Translating snapping improvements.

TiledCollisionEditor/main.cpp

@@ -19,6 +19,8 @@ class TiledCollisionEditor : public olc::PixelGameEngine
 	std::string selectedObj="";
 	int editingPoint=4; //0-3 for the index we are editing within editingQuad.
 	bool dragging=false;
+	bool dragTranslate=false;
+	vf2d upperLeftDragOffset{};
 
 	Renderable circle;
 
@@ -131,6 +133,14 @@ public:
 				(*editingQuad)[3]=vf2d{initialPoint.x,cursorPos.y};
 			}
 
+			if(dragTranslate){
+				vf2d translateAmt=GetSnapPoint()-originalQuad[0]-upperLeftDragOffset;
+				for(size_t pointInd=0;vf2d&point:*editingQuad){
+					(*editingQuad)[pointInd]=originalQuad[pointInd]+translateAmt;
+					pointInd++;
+				}
+			}
+
 			if(GetMouse(Mouse::LEFT).bPressed){
 				#pragma region Select a point on a collision quad.
 				for(const Quadrilateral&quad:obj.collisionTiles){
@@ -145,8 +155,23 @@ public:
 						pointInd++;
 					}
 				}
-				exitCollisionCheck:
 				#pragma endregion
+				for(const Quadrilateral&quad:obj.collisionTiles){
+					std::array<geom2d::triangle<float>,2>collisionTris{
+						geom2d::triangle<float>{quad[0],quad[1],quad[2]},
+						geom2d::triangle<float>{quad[0],quad[2],quad[3]},
+					};
+					for(geom2d::triangle<float>&tri:collisionTris){
+						if(geom2d::contains(tri,view.ScreenToWorld(GetMousePos()))){
+							dragTranslate=true;
+							editingQuad=const_cast<Quadrilateral*>(&quad);
+							upperLeftDragOffset=GetSnapPoint()-quad[0];
+							originalQuad=*editingQuad;
+							goto exitCollisionCheck;
+						}
+					}
+				}
+				exitCollisionCheck:
 				if(EditingQuad&&!dragging){
 					(*editingQuad)[editingPoint]=GetSnapPoint();
 					editingPoint++;
@@ -174,6 +199,7 @@ public:
 					(*editingQuad)[editingPoint]=GetSnapPoint();
 					editingPoint=4;
 				}
+				dragTranslate=false;
 			}
 
 			if(GetMouse(Mouse::RIGHT).bPressed||GetKey(ESCAPE).bPressed){