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anim.go
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anim.go
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/*
Copyright (C) 2021 Alexander Lunsford
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
type Anim struct {
frames []*Sprite
speed float64 //Frames per second
loop bool
timer float64
frame int
finished bool //True when it is not looped and has reached the end
callback func(*Anim) //Called when the frame is changed
}
func (anim *Anim) GetSprite() *Sprite {
return anim.frames[anim.frame]
}
func (anim *Anim) Update(deltaTime float64) {
anim.timer += deltaTime
if anim.timer > anim.speed {
anim.timer = 0.0
anim.frame += 1
if anim.frame >= len(anim.frames) {
if anim.loop {
anim.frame = 0
} else {
anim.frame -= 1
anim.finished = true
}
}
if anim.callback != nil {
anim.callback(anim)
}
}
}