animation.adept

// --------------------------- animation.adept ---------------------------
// Module for basic animation management
// -----------------------------------------------------------------------

struct Animation (frames *uint, length usize,
    current_frame usize, ticker usize, interval usize)

func create(this *Animation, data *uint, length usize, animation_interval usize) void {
    this.frames = data
    this.length = length
    this.current_frame = 0
    this.ticker = 0
    this.interval = animation_interval
}

func reset(this *Animation) void {
    this.current_frame = 0ui
    this.ticker = 0ui
}

func now(this *Animation) uint {
    return this.frames[this.current_frame]
}

func nextFrame(this *Animation) void {
    if this.current_frame + 1 == this.length, this.current_frame = 0
    else this.current_frame = this.current_frame + 1
}

func update(this *Animation) void {
    this.ticker += 1
    if this.ticker > this.interval, this.ticker = 0; nextFrame(this)
}

func free(this *Animation) void {
    // Only call if frames data was dynamically allocated
    free(this.frames)
}