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package demonchime
import "core:log"
import "core:math"
import "core:math/linalg"
import "fw"
Rope :: struct {
handle: Entity_Handle,
hanging_id: Image_Id,
verlet: Verlet_Rope,
}
step_ropes :: proc(dt: f32) {
iter := iter_entity_list(state.rope_list)
for rope in entity_list_iter(&iter) {
update_verlet_rope(&rope.verlet)
}
}
draw_ropes :: proc() {
iter := iter_entity_list(state.rope_list)
for rope in entity_list_iter(&iter) {
for i in 0..<len(rope.verlet.nodes) - 1 {
cur := rope.verlet.nodes[i]
nex := rope.verlet.nodes[i + 1]
fw.draw_line(
linalg.round(cur.pos),
linalg.round(nex.pos),
color = fw.rgba8(76, 62, 36),
)
}
a := rope.verlet.nodes[len(rope.verlet.nodes) - 1]
b := rope.verlet.nodes[len(rope.verlet.nodes) - 2]
dir := b.pos - a.pos
rotation := math.atan2(dir.y, dir.x) + math.PI / 2
img := get_image(rope.hanging_id)
fw.draw_tex_ex(
img,
a.pos,
offset = linalg.round(Vec2{f32(img.size.x) * 0.5, 0}),
rot = rotation,
)
}
}
clear_ropes :: proc() {
iter := iter_entity_list(state.rope_list)
for rope in entity_list_iter(&iter) {
delete(rope.verlet.nodes)
delete_entity(&state.rope_list, rope.handle)
}
}
on_room_open_rope :: proc(room_id: Room_Id) {
clear_ropes()
}
object_spawner_rope :: proc(obj: Object_Resource) {
image_id, is_image_id := convert_path_to_resource(obj, "image").(Image_Id)
if !is_image_id {
image_id = .Small_Lamp
}
node_length := obj.properties["node_length"].(i32)
length := obj.properties["length"].(i32)
nodes := make([]Verlet_Node, length)
for &node, i in nodes {
node = create_verlet_node(
obj.pos + Vec2{0, f32(i) * f32(node_length)},
i == 0,
)
}
verlet := Verlet_Rope{
nodes = nodes,
node_length = f32(node_length),
}
// Simulate a few steps to get rid of some silliness
for _ in 0..<60 {
update_verlet_rope(&verlet)
}
make_entity(&state.rope_list, Rope{
hanging_id = image_id,
verlet = verlet,
})
}
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