mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
136 lines
2.9 KiB
Go
136 lines
2.9 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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// +build example
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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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hue128 = 0
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saturation128 = 128
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value128 = 128
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inverted = false
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prevPressedI = false
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gophersImage *ebiten.Image
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)
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// clamp clamps v to the range [min, max].
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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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// Adjust HSV values along with the user's input.
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if ebiten.IsKeyPressed(ebiten.KeyQ) {
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hue128--
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}
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if ebiten.IsKeyPressed(ebiten.KeyW) {
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hue128++
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}
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if ebiten.IsKeyPressed(ebiten.KeyA) {
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saturation128--
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}
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if ebiten.IsKeyPressed(ebiten.KeyS) {
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saturation128++
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}
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if ebiten.IsKeyPressed(ebiten.KeyZ) {
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value128--
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}
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if ebiten.IsKeyPressed(ebiten.KeyX) {
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value128++
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}
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hue128 = clamp(hue128, -256, 256)
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saturation128 = clamp(saturation128, 0, 256)
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value128 = clamp(value128, 0, 256)
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pressedI := ebiten.IsKeyPressed(ebiten.KeyI)
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if pressedI && !prevPressedI {
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inverted = !inverted
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}
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prevPressedI = pressedI
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if ebiten.IsRunningSlowly() {
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return nil
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}
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// Center the image on the screen.
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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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// Change HSV.
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hue := float64(hue128) * 2 * math.Pi / 128
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saturation := float64(saturation128) / 128
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value := float64(value128) / 128
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op.ColorM.ChangeHSV(hue, saturation, value)
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// Invert the color.
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if inverted {
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op.ColorM.Scale(-1, -1, -1, 1)
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op.ColorM.Translate(1, 1, 1, 0)
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}
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screen.DrawImage(gophersImage, op)
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// Draw the text of the current status.
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msgInverted := "false"
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if inverted {
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msgInverted = "true"
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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]
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Inverted: %s [I]`, hue, saturation, value, msgInverted)
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ebitenutil.DebugPrint(screen, msg)
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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.FilterDefault)
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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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