/
main.go
205 lines (170 loc) · 4.04 KB
/
main.go
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package main
import (
"encoding/hex"
"fmt"
"os"
"runtime"
"github.com/veandco/go-sdl2/sdl"
"golang.org/x/net/websocket"
"gopkg.in/vmihailenco/msgpack.v2"
)
var (
winTitle = "The Game"
winWidth = 1000
winHeight = 600
)
type Ship struct {
Position V2
V float64
Rotation float64
Size float64
Doge bool
}
// Points returns []sdl.Point for the ship body (and doge)
func (s Ship) Points() []sdl.Point {
// The ship triangle
points := V2s{
{0, -s.Size / 2},
{s.Size / 2, s.Size / 2},
{-s.Size / 2, s.Size / 2},
{0, -s.Size / 2},
}
// Add a square if the ship is the doge
if s.Doge {
points = points.Merge(V2s{
{-4, -4},
{-4, 4},
{4, 4},
{4, -4},
{-4, -4},
})
}
return points.Rotate(-s.Rotation).ToPointsOffset(s.Position)
}
type join struct {
Join interface{} `msgpack:"join"`
}
func joinMessage(name string) []byte {
n := struct {
Name string `msgpack:"name"`
}{
Name: name,
}
m := join{Join: n}
b, _ := msgpack.Marshal(m)
return b
}
type InputState struct {
Left bool `msgpack:"left"`
Right bool `msgpack:"right"`
Thrust bool `msgpack:"thrust"`
}
func (i InputState) Message() []byte {
a := struct {
InputState InputState `msgpack:"inputState"`
}{
InputState: i,
}
b, _ := msgpack.Marshal(a)
return b
}
func (i InputState) IsSameAs(o InputState) bool {
return i.Left == o.Left && i.Right == o.Right && i.Thrust == o.Thrust
}
func (i *InputState) Update(o InputState) {
i.Left = o.Left
i.Right = o.Right
i.Thrust = o.Thrust
}
func run(serverStr, name string) int {
var window *sdl.Window
var renderer *sdl.Renderer
var running bool
var event sdl.Event
var inputState InputState
url := "ws://" + serverStr
origin := "http://" + serverStr
ws, err := websocket.Dial(url, "", origin)
if err != nil {
fmt.Printf("%v\n", err)
os.Exit(1)
}
window, err = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, sdl.WINDOW_SHOWN)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to create window: %s\n", err)
return 1
}
defer window.Destroy()
renderer, err = sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to create renderer: %s\n", err)
return 2
}
defer renderer.Destroy()
renderer.Clear()
websocket.Message.Send(ws, joinMessage(name))
running = true
var data map[string]map[string][]map[string]interface{}
decoder := msgpack.NewDecoder(ws)
renderer.SetDrawColor(1, 1, 1, 255)
renderer.Clear()
for running {
renderer.SetDrawColor(1, 1, 1, 255)
renderer.Clear()
newInputState := inputState
for event = sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.KeyDownEvent:
switch event.(*sdl.KeyDownEvent).Keysym.Sym {
case sdl.K_ESCAPE:
running = false
case sdl.K_LEFT:
newInputState.Left = true
case sdl.K_RIGHT:
newInputState.Right = true
case sdl.K_UP:
newInputState.Thrust = true
}
case *sdl.KeyUpEvent:
switch event.(*sdl.KeyUpEvent).Keysym.Sym {
case sdl.K_LEFT:
newInputState.Left = false
case sdl.K_RIGHT:
newInputState.Right = false
case sdl.K_UP:
newInputState.Thrust = false
}
}
}
if !newInputState.IsSameAs(inputState) {
websocket.Message.Send(ws, newInputState.Message())
inputState = newInputState
}
decoder.Decode(&data)
for _, ship := range data["state"]["ships"] {
colourhex, _ := hex.DecodeString(ship["colour"].(string)[1:7])
rot, _ := ship["rotation"].(float64)
s := Ship{
Position: V2{float64(ship["x"].(int64)), float64(ship["y"].(int64))},
Size: 30,
Rotation: rot,
Doge: ship["doge"].(bool),
}
renderer.SetDrawColor(uint8(colourhex[0]), uint8(colourhex[1]), uint8(colourhex[2]), 255)
renderer.DrawLines(s.Points())
}
renderer.Present()
}
return 0
}
func main() {
runtime.LockOSThread()
if len(os.Args) != 3 {
fmt.Printf("Usage: %v [SERVER] [NAME]\n", os.Args[0])
os.Exit(1)
}
os.Exit(run(os.Args[1], os.Args[2]))
}