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zoom.go
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zoom.go
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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ending
import (
"time"
"github.com/divVerent/aaaaxy/internal/engine"
"github.com/divVerent/aaaaxy/internal/level"
m "github.com/divVerent/aaaaxy/internal/math"
"github.com/divVerent/aaaaxy/internal/propmap"
)
// ZoomTarget zooms the screen out.
type ZoomTarget struct {
World *engine.World
State bool
Frames int
Frame int
}
func (z *ZoomTarget) Spawn(w *engine.World, sp *level.SpawnableProps, e *engine.Entity) error {
z.World = w
var parseErr error
durationTime := propmap.ValueOrP(sp.Properties, "duration", time.Second, &parseErr)
z.Frames = int((durationTime*engine.GameTPS + (time.Second / 2)) / time.Second)
if z.Frames < 1 {
z.Frames = 1
}
return parseErr
}
func (z *ZoomTarget) Despawn() {}
func (z *ZoomTarget) Update() {
if z.Frame > 0 {
z.Frame--
z.World.MaxVisiblePixels = int(m.Delta{DX: engine.GameWidth, DY: engine.GameHeight}.Length() * 0.5 * float64(z.Frame) / float64(z.Frames))
}
}
func (z *ZoomTarget) SetState(originator, predecessor *engine.Entity, state bool) {
if state == z.State {
return
}
z.State = state
if state {
z.Frame = z.Frames
} else {
z.Frame = 0
}
}
func (z *ZoomTarget) Touch(other *engine.Entity) {}
func init() {
engine.RegisterEntityType(&ZoomTarget{})
}