mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
// Copyright 2016 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"fmt"
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_ "image/jpeg"
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"log"
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"math"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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hueInt = 0
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saturationInt = 128
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valueInt = 128
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gophersImage *ebiten.Image
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)
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func clamp(v, min, max int) int {
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if min > max {
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panic("min must <= max")
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}
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if v < min {
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return min
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}
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if max < v {
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return max
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}
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return v
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}
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func update(screen *ebiten.Image) error {
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if ebiten.IsKeyPressed(ebiten.KeyQ) {
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hueInt--
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}
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if ebiten.IsKeyPressed(ebiten.KeyW) {
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hueInt++
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}
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if ebiten.IsKeyPressed(ebiten.KeyA) {
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saturationInt--
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}
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if ebiten.IsKeyPressed(ebiten.KeyS) {
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saturationInt++
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}
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if ebiten.IsKeyPressed(ebiten.KeyZ) {
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valueInt--
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}
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if ebiten.IsKeyPressed(ebiten.KeyX) {
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valueInt++
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}
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hueInt = clamp(hueInt, -256, 256)
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saturationInt = clamp(saturationInt, 0, 256)
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valueInt = clamp(valueInt, 0, 256)
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w, h := gophersImage.Size()
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2)
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hue := float64(hueInt) * 2 * math.Pi / 128
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saturation := float64(saturationInt) / 128
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value := float64(valueInt) / 128
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op.ColorM.ChangeHSV(hue, saturation, value)
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if err := screen.DrawImage(gophersImage, op); err != nil {
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return err
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}
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msg := fmt.Sprintf(`Hue: %0.2f [Q][W]
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Saturation: %0.2f [A][S]
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Value: %0.2f [Z][X]`, hue, saturation, value)
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if err := ebitenutil.DebugPrint(screen, msg); err != nil {
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return err
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}
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return nil
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}
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func main() {
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var err error
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gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "HSV (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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