mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
// Copyright 2016 Hajime Hoshi
|
|
//
|
|
// 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 main
|
|
|
|
import (
|
|
"fmt"
|
|
_ "image/jpeg"
|
|
"log"
|
|
"math"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/ebitenutil"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
hueInt = 0
|
|
saturationInt = 128
|
|
valueInt = 128
|
|
gophersImage *ebiten.Image
|
|
)
|
|
|
|
func clamp(v, min, max int) int {
|
|
if min > max {
|
|
panic("min must <= max")
|
|
}
|
|
if v < min {
|
|
return min
|
|
}
|
|
if max < v {
|
|
return max
|
|
}
|
|
return v
|
|
}
|
|
|
|
func update(screen *ebiten.Image) error {
|
|
if ebiten.IsKeyPressed(ebiten.KeyQ) {
|
|
hueInt--
|
|
}
|
|
if ebiten.IsKeyPressed(ebiten.KeyW) {
|
|
hueInt++
|
|
}
|
|
if ebiten.IsKeyPressed(ebiten.KeyA) {
|
|
saturationInt--
|
|
}
|
|
if ebiten.IsKeyPressed(ebiten.KeyS) {
|
|
saturationInt++
|
|
}
|
|
if ebiten.IsKeyPressed(ebiten.KeyZ) {
|
|
valueInt--
|
|
}
|
|
if ebiten.IsKeyPressed(ebiten.KeyX) {
|
|
valueInt++
|
|
}
|
|
hueInt = clamp(hueInt, -256, 256)
|
|
saturationInt = clamp(saturationInt, 0, 256)
|
|
valueInt = clamp(valueInt, 0, 256)
|
|
|
|
w, h := gophersImage.Size()
|
|
op := &ebiten.DrawImageOptions{}
|
|
op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2)
|
|
hue := float64(hueInt) * 2 * math.Pi / 128
|
|
saturation := float64(saturationInt) / 128
|
|
value := float64(valueInt) / 128
|
|
op.ColorM.ChangeHSV(hue, saturation, value)
|
|
if err := screen.DrawImage(gophersImage, op); err != nil {
|
|
return err
|
|
}
|
|
|
|
msg := fmt.Sprintf(`Hue: %0.2f [Q][W]
|
|
Saturation: %0.2f [A][S]
|
|
Value: %0.2f [Z][X]`, hue, saturation, value)
|
|
if err := ebitenutil.DebugPrint(screen, msg); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
var err error
|
|
gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "HSV (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|