/
coords.go
61 lines (51 loc) · 1.46 KB
/
coords.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 menu
import (
"github.com/divVerent/aaaaxy/internal/engine"
m "github.com/divVerent/aaaaxy/internal/math"
)
const CenterX = engine.GameWidth / 2
const HeaderY = engine.GameHeight / 4
type Direction int
const (
NotClicked Direction = iota
LeftClicked
CenterClicked
RightClicked
)
func ItemBaselineY(i, n int) int {
return engine.GameHeight * (31 - 2*(n-i)) / 32
}
func ItemClicked(pos m.Pos, n int) (int, Direction) {
// Clicked far at side?
if pos.X < engine.GameWidth/8 || pos.X > 7*engine.GameWidth/8 {
return -1, NotClicked
}
// Adjust for baseline.
y := pos.Y + engine.GameHeight/64
// Map to index.
i := n - (31-y*32/engine.GameHeight)/2
if i >= 0 && i < n {
dir := CenterClicked
if pos.X < engine.GameWidth/3 {
dir = LeftClicked
} else if pos.X > 2*engine.GameWidth/3 {
dir = RightClicked
}
return i, dir
}
// Outside.
return -1, NotClicked
}