ebiten写一个输入框

以下是一个使用Ebiten构建的基本输入框示例：

package main

import (
    "github.com/hajimehoshi/ebiten"
    "github.com/hajimehoshi/ebiten/inpututil"
    "github.com/hajimehoshi/ebiten/text"
    "golang.org/x/image/font"
    "golang.org/x/image/font/opentype"
    "image"
    "image/color"
    "io/ioutil"
)

const (
    screenWidth  = 640
    screenHeight = 480
    fontPath     = "font.ttf"
    fontSize     = 24
)

var (
    inputText   string
    fontFace    font.Face
    inputActive bool
)

func init() {
    // Load the font file.
    fontData, err := ioutil.ReadFile(fontPath)
    if err != nil {
        panic(err)
    }

    // Parse the font data and create a font face.
    font, err := opentype.Parse(fontData)
    if err != nil {
        panic(err)
    }
    fontFace = truetype.NewFace(font, &truetype.Options{
        Size: fontSize,
    })
}

func update(screen *ebiten.Image) error {
    // Check if the user clicked on the input box.
    if inputActive {
        if inpututil.IsKeyJustPressed(ebiten.KeyBackspace) && len(inputText) > 0 {
            inputText = inputText[:len(inputText)-1]
        } else {
            for _, key := range inpututil.PressedKeys() {
                if len(key) == 1 {
                    inputText += key
                }
            }
        }
    }

    // Draw the input box.
    rect := image.Rect(100, 100, 300, 150)
    if inputActive {
        ebitenutil.DrawRect(screen, float64(rect.Min.X), float64(rect.Min.Y), float64(rect.Dx()), float64(rect.Dy()), color.White)
    } else {
        ebitenutil.DrawRect(screen, float64(rect.Min.X), float64(rect.Min.Y), float64(rect.Dx()), float64(rect.Dy()), color.Gray{128})
    }

    // Draw the input text.
    text.Draw(screen, inputText, fontFace, rect.Min.X+10, rect.Min.Y+10, color.Black)

    // Check if the user clicked on the input box.
    if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
        mx, my := ebiten.CursorPosition()
        if rect.Min.X < mx && mx < rect.Max.X && rect.Min.Y < my && my < rect.Max.Y {
            inputActive = true
        } else {
            inputActive = false
        }
    }

    return nil
}

func main() {
    if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Input Box"); err != nil {
        panic(err)
    }
}

该示例创建了一个简单的输入框，其中用户可以点击并在其中输入文本。 请注意，此示例仅包含基本的文本输入和删除功能，并未包含完整的输入控件功能