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pointercoord.go
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pointercoord.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 input
import (
"math"
m "github.com/divVerent/aaaaxy/internal/math"
)
func pointerCoords(screenWidth, screenHeight, gameWidth, gameHeight int, crtK1, crtK2 float64, x, y int) m.Pos {
inX := float64(x)*float64(gameWidth)/float64(screenWidth) + 0.5
inY := float64(y)*float64(gameHeight)/float64(screenHeight) + 0.5
// Straight ported from linear2xcrt.kage.
// Assume srcImageSize is 1:1 -> "square pixels".
srcImageSizeSrcSizeLen := math.Hypot(float64(gameWidth), float64(gameHeight))
mapVecX := 1 / (0.5 * srcImageSizeSrcSizeLen)
mapVecY := 1 / (0.5 * srcImageSizeSrcSizeLen)
srcMidX := float64(gameWidth) / 2
srcMidY := float64(gameHeight) / 2
inRelX := (inX - srcMidX) * mapVecX
inRelY := (inY - srcMidY) * mapVecY
inLen := math.Hypot(inRelX, inRelY)
inLen2 := inLen * inLen
outFac := 1.0 + inLen2*(crtK1+inLen2*crtK2)
outRelX := inRelX * outFac
outRelY := inRelY * outFac
outX := srcMidX + outRelX/mapVecX
outY := srcMidY + outRelY/mapVecY
return m.Pos{
X: m.Rint(outX),
Y: m.Rint(outY),
}
}