func drawBackground(ctx *html.Context, delta float64) {
ctx.FillStyle = html.NewRGBColor(0, 19, 41)
ctx.FillRect(0, 0, 800, 480)
ctx.BeginPath()
ctx.ShadowBlur = 50
ctx.ShadowColor = html.NewRGBColor(220, 220, 220)
ctx.FillStyle = html.NewRGBColor(255, 255, 255)
ctx.Arc(
400+int(450*math.Cos(moonPosition)),
300+int(200*math.Sin(moonPosition)),
50, 0, math.Pi*2, false)
ctx.Fill()
moonPosition += delta * 0.001
ctx.ShadowBlur = 0
for i := 0; i < len(clouds); i++ {
c := clouds[i]
ctx.BeginPath()
ctx.FillStyle = html.Color("rgba(255, 255, 255, 0.2)")
ctx.Save()
ctx.Translate(int(c.X), int(c.Y))
for _, p := range c.parts {
ctx.Arc(p.X, p.Y, p.R, 0, math.Pi*2, false)
ctx.ClosePath()
}
ctx.Fill()
ctx.Restore()
c.X += c.Speed
if c.X > 820 {
c.parts = c.parts[:0]
c.init()
c.X = -100
}
}
}
func (ps *ParticleSystem) Draw(ctx *html.Context, delta float64) {
living := 0
ctx.BeginPath()
ctx.FillStyle = ps.Color
ctx.Save()
ctx.Translate(int(ps.X*tileSize), int(ps.Y*tileSize))
for _, p := range ps.particles {
if p.Life > 15 {
continue
}
living++
p.Life += delta
p.X += p.DX
p.Y += p.DY
p.DX += 0.1 * delta
ctx.Arc(int(p.X), int(p.Y), ps.Size, 0, math.Pi*2, false)
ctx.ClosePath()
}
ctx.Fill()
ctx.Restore()
if living == 0 {
RemoveEntity(ps)
}
}
func (p *Player) Draw(ctx *html.Context, delta float64) {
p.LX, p.LY = p.X, p.Y
p.Y += 0.1
onGround, _, _ := p.Collides()
p.Y = p.LY
if math.Abs(p.HSpeed) > 0 {
if math.Abs(p.HSpeed) > 0.012 {
if onGround {
p.HSpeed -= math.Copysign(0.01*delta, p.HSpeed)
} else {
p.HSpeed -= math.Copysign(0.001*delta, p.HSpeed)
}
} else {
p.HSpeed = 0
}
}
if !onGround {
p.VSpeed += 0.02 * delta
} else {
p.VSpeed = 0
}
if p.VSpeed > 1 {
p.VSpeed = 1
}
if p.isKeyDown[html.KeyW] || p.isKeyDown[' '] {
p.jumpDownFor += delta
} else {
p.jumpDownFor = 0
}
if p.jumpDownFor > 0 && onGround {
p.VSpeed = -0.5
}
if p.isKeyDown[html.KeyD] && onGround {
p.HSpeed = 0.2
} else if p.isKeyDown[html.KeyA] && onGround {
p.HSpeed = -0.2
}
if p.HSpeed != 0 {
p.lastDir = math.Copysign(1, p.HSpeed)
}
p.X += 0.01
touchingWall, _, _ := p.Collides()
p.X = p.LX
if p.jumpDownFor > 3 && !onGround && touchingWall {
p.HSpeed *= -1.2
p.VSpeed = -0.5
AddEntity(NewParticleSystem(ParticleCircle, html.NewRGBColor(128, 83, 45), 1, 10, p.X+0.75, p.Y))
}
p.X -= 0.01
touchingWall, _, _ = p.Collides()
p.X = p.LX
if p.jumpDownFor > 3 && !onGround && touchingWall {
p.HSpeed *= -1.2
p.VSpeed = -0.5
AddEntity(NewParticleSystem(ParticleCircle, html.NewRGBColor(128, 83, 45), 1, 20, p.X+0.75, p.Y))
}
if math.Abs(p.HSpeed) > 0.6 {
p.HSpeed = math.Copysign(0.6, p.HSpeed)
}
if p.leapTime > 0 {
p.leapTime -= delta
if p.leapTime <= 0 {
p.HSpeed = p.leapDX
p.VSpeed = p.leapDY
}
} else {
p.leapTime = 0
if p.armLength > 10 {
p.armLength -= delta * 2
} else {
p.armLength = 10
}
}
p.X += p.HSpeed * delta
if ok, nx, _ := p.Collides(); ok {
p.X = nx
}
p.Y += p.VSpeed * delta
if ok, _, ny := p.Collides(); ok {
p.Y = ny
p.VSpeed = 0
}
if p.LX != p.X || p.LY != p.Y {
p.animation = 1
} else {
p.animation = 0
}
if p.attackTime > 0 {
p.attackTime -= delta
if p.attackTime <= 0 {
p.armParts[1].VX = -1 * p.lastDir
p.armParts[2].VX = -0.5 * p.lastDir
for _, e := range entities {
if e == player {
continue
}
if pr, ok := e.(*Person); ok {
dx := pr.X - (p.X + p.armParts[1].X/tileSize)
dy := pr.Y - (p.Y + p.armParts[1].Y/tileSize)
if dx*dx+dy*dy < 3*3 {
ps := NewParticleSystem(ParticleCircle, html.NewRGBColor(255, 0, 0), 1, 20, pr.X+0.7, pr.Y+0.2)
AddEntity(ps)
RemoveEntity(pr)
kills++
name := "hit"
if globalRand.Float64() < 0.5 {
name = "hit2"
}
audio := js.Global.Get("Audio").New()
if audio.Call("canPlayType", "audio/mpeg").Bool() {
audio.Set("type", "audio/mpeg")
audio.Set("src", "sound/"+name+".mp3")
} else {
audio.Set("type", "audio/ogg")
audio.Set("src", "sound/"+name+".ogg")
}
audio.Set("volume", 0.4)
audio.Call("play")
}
}
}
}
} else {
p.attackTime = 0
}
img := Images["player"]
p.animationTime += delta * 0.1
info := playerAnimationFrames[p.animation]
frames := float64(info.Frames)
if p.animationTime > frames {
p.animationTime -= frames
}
offset := (int(p.animationTime) % info.Frames) * 24
ctx.Save()
ctx.Translate(int(p.X*tileSize)+12, int(p.Y*tileSize)+16)
ctx.Scale(p.lastDir, 1)
ctx.DrawImageSection(img, offset, p.animation*32, 24, 32, -12, -15, 24, 32)
ctx.Restore()
p.armParts[0].X, p.armParts[0].Y = float64(info.OX), float64(info.OY)
if p.lastDir < 0 {
p.armParts[0].X = 24 - p.armParts[0].X
}
armLength := p.armLength
for i := 0; i < 2; i++ {
if dx, dy := p.armParts[i].X-p.armParts[i+1].X, p.armParts[i].Y-p.armParts[i+1].Y; dx*dx+dy*dy >= armLength*armLength {
ang := math.Atan2(dx, dy)
p.armParts[i+1].X = p.armParts[i].X - armLength*math.Sin(ang)
p.armParts[i+1].Y = p.armParts[i].Y - armLength*math.Cos(ang)
}
p.armParts[i+1].X -= p.HSpeed * 10
p.armParts[i+1].Y -= p.VSpeed * 10
p.armParts[i+1].X += p.armParts[i+1].VX
p.armParts[i+1].Y += p.armParts[i+1].VY
if math.Abs(p.armParts[i+1].VX) > 0.01 {
p.armParts[i+1].VX -= math.Copysign(delta*0.1, p.armParts[i+1].VX)
} else {
p.armParts[i+1].VX = 0
}
if math.Abs(p.armParts[i+1].VY) > 0.01 {
p.armParts[i+1].VY -= math.Copysign(delta*0.1, p.armParts[i+1].VY)
} else {
p.armParts[i+1].VY = 0
}
if ok, _, _ := CheckCollision(&box{
x: (p.X * tileSize) + p.armParts[i+1].X - 1,
y: (p.Y * tileSize) + p.armParts[i+1].Y - 1,
w: 2,
h: 2,
}, 0, 0); !ok {
p.armParts[i+1].Y += 0.1 * float64(i+1)
}
}
ctx.Save()
ctx.Translate(int(p.X*tileSize), int(p.Y*tileSize))
ctx.StrokeStyle = html.NewRGBColor(183, 107, 113)
ctx.LineJoin = html.RoundJoin
ctx.LineCap = html.Round
ctx.LineWidth = 2
ctx.BeginPath()
ctx.MoveTo(int(p.armParts[0].X), int(p.armParts[0].Y))
ctx.LineTo(int(p.armParts[1].X), int(p.armParts[1].Y))
ctx.LineTo(int(p.armParts[2].X), int(p.armParts[2].Y))
ctx.Stroke()
ctx.StrokeStyle = html.NewRGBColor(155, 75, 82)
ctx.LineWidth = 1
ctx.BeginPath()
ctx.MoveTo(int(p.armParts[0].X+1), int(p.armParts[0].Y+1))
ctx.LineTo(int(p.armParts[1].X+1), int(p.armParts[1].Y+1))
ctx.LineTo(int(p.armParts[2].X+1), int(p.armParts[2].Y+1))
ctx.Stroke()
ctx.Restore()
}