Implementation of road intersections and road splitting (halfway)

common/constants.odin

@@ -15,5 +15,6 @@ ROAD_COLOUR		   :: rl.BLACK
 NODE_DONE_COLOUR   :: rl.BROWN
 NODE_BUILD_COLOUR  :: rl.GOLD
 NODE_CURSOR_COLOUR :: rl.BLUE
+NODE_SNAP_COLOUR   :: rl.PINK
 
 BACKGROUND_COLOUR  :: rl.LIGHTGRAY

common/structures.odin

@@ -0,0 +1,8 @@
+package common
+
+import rl "vendor:raylib"
+
+Intersection_Data :: struct {
+	road: u32,
+	point: rl.Vector2,
+}

infrastructure/node.odin

@@ -1,19 +1,26 @@
 package infrastructure
 
+import "../common"
 import rl "vendor:raylib"
 
 Node :: struct {
-	id: u32,
 	enabled: bool,
 	pos: rl.Vector2,
 	roads: [dynamic]u32,
 }
 
-node_init :: proc(new_id: u32, new_pos: rl.Vector2) -> Node {
+node_init :: proc(new_pos: rl.Vector2) -> Node {
 	return {
-		id = new_id,
 		enabled = true,
 		pos = new_pos,
 		roads = nil,
 	}
+}
+
+node_within_snapping_radius :: proc(self: ^Node, pos: rl.Vector2) -> bool {
+	return rl.CheckCollisionPointCircle(
+		pos,
+		self.pos,
+		common.NODE_SNAP_RADIUS * common.NODE_RADIUS,
+	)
 }

infrastructure/road.odin

@@ -1,13 +1,11 @@
 package infrastructure
 
 Road :: struct {
-	id: u32,
 	nodes: [2]u32,
 }
 
-road_init :: proc(new_id: u32, start: u32, end: u32) -> Road {
+road_init :: proc(start: u32, end: u32) -> Road {
 	return {
-		id = new_id,
 		nodes = {start, end}
 	}
 }

simulator.odin

@@ -1,6 +1,5 @@
 package main
 
-import "base:intrinsics"
 import rl "vendor:raylib"
 
 import "common"
@@ -10,6 +9,9 @@ Simulator :: struct {
 	nodes: [dynamic]inf.Node,
 	roads: [dynamic]inf.Road,
 	temp_node_index: Maybe(u32),
+	// tracking variables
+	show_details: bool,
+	auto_continue: bool,
 }
 
 init :: proc() -> Simulator {
@@ -17,6 +19,8 @@ init :: proc() -> Simulator {
 		nodes = nil,
 		roads = nil,
 		temp_node_index = nil,
+		show_details = false,
+		auto_continue = false,
 	}
 }
 
@@ -33,6 +37,9 @@ handle_input :: proc(self: ^Simulator, pos: rl.Vector2) {
 
 @(private="file")
 handle_keyboard_input :: proc(self: ^Simulator) {
+	self.show_details = rl.IsKeyDown(.LEFT_ALT)
+	self.auto_continue = rl.IsKeyDown(.LEFT_CONTROL)
+	
 	if (rl.IsKeyReleased(.C)) {
 		self.temp_node_index = nil
 		clear(&self.roads)
@@ -47,13 +54,15 @@ handle_mouse_input :: proc(self: ^Simulator, pos: rl.Vector2) {
 
 @(private="file")
 left_click_event :: proc(self: ^Simulator, pos: rl.Vector2) {
-	cur_node_index := get_selected_node(self, pos)
+	cur_node_index := get_or_create_node(self, pos)
 	
 	if val, ok := self.temp_node_index.?; ok {
-		road := inf.road_init(get_new_id(self, self.roads[:]), val, cur_node_index)
+		// TODO remove
+		// replace by splitting functionality
+		road := inf.road_init(val, cur_node_index)
 		append(&self.roads, road)
 		
-		self.temp_node_index = nil
+		self.temp_node_index = self.auto_continue ? cur_node_index : nil
 		return
 	}
 	
@@ -63,6 +72,7 @@ left_click_event :: proc(self: ^Simulator, pos: rl.Vector2) {
 draw :: proc(self: ^Simulator, pos: rl.Vector2) {
 	rl.ClearBackground(common.BACKGROUND_COLOUR)
 	
+	// draw roads
 	for &road in self.roads {
 		start := road.nodes[0]
 		end := road.nodes[1]
@@ -70,7 +80,11 @@ draw :: proc(self: ^Simulator, pos: rl.Vector2) {
 		rl.DrawLineEx(self.nodes[start].pos, self.nodes[end].pos, common.ROAD_SIZE, common.ROAD_COLOUR)
 	}
 	
+	// draw nodes
 	for &node in self.nodes {
+		// draws the snapping radius if key is held down
+		if self.show_details do rl.DrawCircleV(node.pos, common.NODE_SNAP_RADIUS * common.NODE_RADIUS, common.NODE_SNAP_COLOUR)
+		// draws the node
 		rl.DrawCircleV(node.pos, common.NODE_RADIUS, common.NODE_DONE_COLOUR)
 	}
 	
@@ -80,26 +94,80 @@ draw :: proc(self: ^Simulator, pos: rl.Vector2) {
 	}
 }
 
+// This function only returns the index to the node or if it doesn't exist bool in the tuple is false
+@(private="file")
+get_selected_node :: proc(self: ^Simulator, pos: rl.Vector2) -> (u32, bool) {
+	for &node, index in self.nodes {
+		if inf.node_within_snapping_radius(&node, pos) do return u32(index), true
+	}
+	
+	return 0, false
+}
+
 // Given position, the function will attempt the return the pointer to the node in near vicinity, 
 // or if unsuccesful manually creating the node based on the position in the list and then returning the pointer to it
 @(private="file")
-get_selected_node :: proc(self: ^Simulator, pos: rl.Vector2) -> u32 {
-	for node, index in self.nodes {
-		if (!rl.CheckCollisionPointCircle(pos, node.pos, common.NODE_SNAP_RADIUS * common.NODE_RADIUS)) do continue
-		
-		return u32(index)
-	}
+get_or_create_node :: proc(self: ^Simulator, pos: rl.Vector2) -> u32 {
+	if node, ok := get_selected_node(self, pos); ok do return node
 	
-	node := inf.node_init(get_new_id(self, self.nodes[:]), pos)
+	node := inf.node_init(pos)
 	append(&self.nodes, node)
 	
 	return u32(len(self.nodes) - 1)
 }
 
+// Returns data about roads that intersect the given 2 nodes (points)
 @(private="file")
-get_new_id :: proc(self: ^Simulator, man: []$T) -> u32
-where intrinsics.type_field_type(T, "id") == u32 {
-	mlen := len(man)
+get_intersecting_roads :: proc(self: ^Simulator, start: u32, end: u32) -> []common.Intersection_Data {
+	intersections: [dynamic]common.Intersection_Data
+	collision_point: rl.Vector2
 	
-	return mlen == 0 ? 0 : man[mlen - 1].id + 1
+	outer: for road, index in self.roads {
+		road_start_node := road.nodes[0]
+		road_end_node := road.nodes[1]
+		
+		if !rl.CheckCollisionLines(self.nodes[start].pos, self.nodes[end].pos, self.nodes[road_start_node].pos, self.nodes[road_end_node].pos, &collision_point) do continue
+		
+		// Save the collision info
+		data := common.Intersection_Data {
+			road = u32(index),
+			point = collision_point
+		}
+		
+		node := inf.node_init(data.point)
+		// Here we check if the intersection points that were recorded before, are already within snapping radius of our current intersected point
+		for collision in intersections {
+			if (inf.node_within_snapping_radius(&node, collision.point)) do continue outer
+		}
+		
+		// Here we check if our new intersected point node is too close to already established nodes
+		if _, ok := get_selected_node(self, data.point); ok do continue
+		
+		append(&intersections, data)
+	}
+	
+	return intersections[:]
+}
+
+split_roads_by_points :: proc(self: ^Simulator, intersections: []common.Intersection_Data, start: u32, end: u32) {
+	if len(intersections) == 0 {
+		road := inf.road_init(start, end)
+		append(&self.roads, road)
+		
+		return
+	}
+	
+	first_intersection_node := get_or_create_node(self, intersections[0].point)
+	road := inf.road_init(start, first_intersection_node)
+	append(&self.roads, road)
+	
+	for intersection in intersections {
+		// TODO
+	}
+	
+	last_intersection_road := intersections[len(intersections) - 1]
+	last_intersection_node := get_or_create_node(self, last_intersection_road.point)
+	
+	road = inf.road_init(last_intersection_node, end)
+	append(&self.roads, road)
 }