/
ball.go
79 lines (64 loc) · 1.55 KB
/
ball.go
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// Copyright (c) 2022 Elias Daler
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 3 of the GNU General Public
// License as published by the Free Software Foundation.
//
// 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 Ball struct {
Entity
frames map[string]FloatRect
}
func makeBall() (*Ball, error) {
e := &Ball{
Entity: NewEntity(),
}
e.Movement.Speed = Vec2f{90, 90}
img, _, err := NewImageFromFile("data/images/ball.png")
if err != nil {
return nil, err
}
e.Graphics.Sprite = NewSprite(img)
e.frames = map[string]FloatRect{
"up.right": {0, 0, 16, 16},
"up.left": {16, 0, 16, 16},
"down.right": {0, 16, 16, 16},
"down.left": {16, 16, 16, 16},
"idle": {0, 32, 16, 16},
}
e.updateFrame()
return e, nil
}
func (e *Ball) setFrame(fn string) {
f, ok := e.frames[fn]
if !ok {
return
}
e.Graphics.Sprite.SetTextureRect(f.ToImageRect())
}
func (e *Ball) updateFrame() {
m := e.Movement
if m.Velocity == (Vec2f{}) {
e.setFrame("idle")
return
}
fn := ""
if m.Velocity.Y < 0 {
fn += "up."
} else {
fn += "down."
}
if m.Velocity.X < 0 {
fn += "left"
} else {
fn += "right"
}
e.setFrame(fn)
}