func (m *Map) Draw(ctx *html.Context) {
if m.dirty || m.cache == nil {
m.dirty = false
if m.cache == nil {
m.cache = html.NewCanvas(m.Width*tileSize, m.Height*tileSize)
}
ctx := m.cache.Context()
for x := 0; x < m.Width; x++ {
for y := 0; y < m.Height; y++ {
m.Tile(x, y).Draw(ctx, x, y)
}
}
}
ctx.DrawImageSection(m.cache, int(cameraX), int(cameraY), 400, 240, 0, 0, 400, 240)
}
func NewMap(path string) *Map {
m := &Map{
Width: 256,
Height: 256,
}
m.Tiles = make([]Tile, m.Width*m.Height)
for i := range m.Tiles {
m.Tiles[i] = Empty
}
img := Images[path]
canvas := html.NewCanvas(m.Width, m.Height)
ctx := canvas.Context()
ctx.DrawImage(img, 0, 0)
id := ctx.GetImageData(0, 0, 256, 256)
data := id.Data
for x := 0; x < m.Width; x++ {
for y := 0; y < m.Height; y++ {
idx := (x + y*m.Width) * 4
col := (int(data[idx]) << 16) | (int(data[idx+1]) << 8) | int(data[idx+2])
switch col {
case 0x000000:
m.SetTile(x, y, InvisWall)
case 0x824700:
m.SetTile(x, y, DirtWall)
case 0x432500:
m.SetTile(x, y, DirtBack)
case 0x917f69:
m.SetTile(x, y, BrickWall)
case 0x725d45:
m.SetTile(x, y, BrickBack)
case 0xffff00:
m.SetTile(x, y, Window1)
case 0x00ffcc:
m.SetTile(x, y, Window2)
case 0xff00ff:
m.StartX, m.StartY = x, y
}
}
}
return m
}
func NewPerson(x, y float64) *Person {
p := &Person{
X: x, Y: y,
lastDir: 1,
}
img := Images["player"]
p.Sprite = html.NewCanvas(256, 4*32*2)
ctx := p.Sprite.Context()
ctx.DrawImageSection(img, 0, 32*2, 256, 32*2*4, 0, 0, 256, 32*2*4)
id := ctx.GetImageData(0, 0, 256, 4*32*2)
hairR, hairG, hairB := globalRand.Intn(256), globalRand.Intn(256), globalRand.Intn(256)
bodyR, bodyG, bodyB := globalRand.Intn(256), globalRand.Intn(256), globalRand.Intn(256)
legsR, legsG, legsB := globalRand.Intn(256), globalRand.Intn(256), globalRand.Intn(256)
for y := 0; y < 32*2*4; y++ {
if (y % (32 * 4)) < 32 {
continue
}
var nR, nG, nB int
if (y % (32 * 4)) < 64 {
nR, nG, nB = hairR, hairG, hairB
} else if (y % (32 * 4)) < 96 {
nR, nG, nB = bodyR, bodyG, bodyB
} else {
nR, nG, nB = legsR, legsG, legsB
}
for x := 0; x < 256; x++ {
r := id.DataIndex((x + y*256) * 4)
a := id.DataIndex((x+y*256)*4 + 3)
if a < 100 {
continue
}
id.SetDataIndex((x+y*256)*4, byte((float64(nR)*float64(r))/256))
id.SetDataIndex((x+y*256)*4+1, byte((float64(nG)*float64(r))/256))
id.SetDataIndex((x+y*256)*4+2, byte((float64(nB)*float64(r))/256))
}
}
ctx.PutImageData(id, 0, 0)
return p
}
func realMain() {
initMaps()
canvas = html.NewCanvas(800, 480)
canvas.AddTo(js.Global.Get("document").Get("body"))
ctx = canvas.Context()
ctx.SetImageSmoothingEnabled(false)
audio := js.Global.Get("Audio").New()
if audio.Call("canPlayType", "audio/mpeg").Bool() {
audio.Set("type", "audio/mpeg")
audio.Set("src", "music/music.mp3")
} else {
audio.Set("type", "audio/ogg")
audio.Set("src", "music/music.ogg")
}
audio.Set("loop", true)
audio.Set("volume", 0.4)
audio.Call("play")
instructions := js.Global.Get("document").Call("createElement", "pre")
instructions.Set("innerHTML", `Instructions:
Try and kill as much as you can in one night (the time is takes for the moon to travel
across the sky).
Controls:
WASD - Move
W/Space - Jump
Hold W/Space whilst landing on a wall - Wall jump
Left click = Attack
Right click = Leap
`)
js.Global.Get("document").Get("body").Call("appendChild", instructions)
SetLevel(0)
html.RequestFrame(drawFrame)
}