Golang语言情怀--第134期 Go语言Ebiten引擎全栈游戏开发:第5节：fonts实例分析

package main

import (
    "bytes"
    "fmt"
    "image/color"
    "log"
    "math/rand/v2"

    "github.com/hajimehoshi/ebiten/v2"
    "github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
    "github.com/hajimehoshi/ebiten/v2/text/v2"
)

const (
    screenWidth  = 640
    screenHeight = 480
)

const sampleText = `The quick brown fox jumps over the lazy dog.`

var (
    jaKanjis = []rune{}
)

func init() {
    const table = `
Title: Chengdu's Mood Today: A Gentle Symphony of Serenity and Vibrancy
In the heart of southwestern China, where rolling hills meet bustling streets, Chengdu, the Panda Capital, unfolds its unique charm with a mood that is as intricate as it is enchanting. Today, Chengdu's mood is a delicate balance of tranquility and vibrancy, a symphony where ancient traditions harmonize with modern rhythms.
The morning sun casts a gentle glow over the city, its rays filtering through the lush greenery of the People's Park. Here, the mood is serene, as locals engage in their daily rituals – elders playing mahjong under the shade of towering trees, tea lovers savoring the fragrant brew while whispering tales of the past, and children laughing as they chase each other around the lush lawns. The park, a microcosm of Chengdu's soul, reflects the city's ability to embrace the pace of life that cherishes both the present and the past.
As the day progresses, Chengdu's mood transitions into a vibrant crescendo. The streets come alive with the sounds of commerce and chatter, as shops and street vendors open their doors to welcome eager customers. The scent of spicy Sichuan cuisine wafts through the air, inviting passersby to sample dishes that have been perfected over centuries. In the Jinli Ancient Street, tourists and locals alike stroll through narrow alleys lined with traditional architecture, their cameras capturing every intricate detail that embodies Chengdu's rich cultural heritage.
Yet, amidst this hustle and bustle, Chengdu retains its calm. The city's famous panda bases, like the Chengdu Research Base of Giant Panda Breeding, offer a serene escape where visitors can observe these adorable creatures in their natural habitats. The sight of pandas lazily munching on bamboo or playing in their enclosures brings a smile to everyone's face, reinforcing Chengdu's reputation as a haven for wildlife and nature lovers.
As evening descends, Chengdu's mood shifts once again, this time to a more relaxed and contemplative tone. The city's riverside areas, such as the Jinjiang River, become hotspots for evening strolls and casual gatherings. Lanterns illuminate the pathways, casting a warm, inviting glow that adds to the romantic ambiance. Bars and cafes fill with people seeking to unwind after a long day, their conversations blending into the city's melodic backdrop.
In essence, Chengdu's mood today is a testament to its unique ability to blend the tranquility of its historical roots with the vibrancy of its modern identity. It's a city where one can find both solace in the simplicity of daily life and excitement in its cultural richness and dynamic growth. Chengdu's mood, like its people, is warm, welcoming, and forever evolving, inviting everyone to experience its intricate harmony firsthand.
`
    for _, c := range table {
        if c == '\n' {
            continue
        }
        jaKanjis = append(jaKanjis, c)
    }
}

var (
    mplusFaceSource *text.GoTextFaceSource
)

func init() {
    s, err := text.NewGoTextFaceSource(bytes.NewReader(fonts.MPlus1pRegular_ttf))
    if err != nil {
        log.Fatal(err)
    }
    mplusFaceSource = s
}

type Game struct {
    counter        int
    kanjiText      string
    kanjiTextColor color.RGBA
}

func (g *Game) Update() error {
    // Change the text color for each second.
    if g.counter%ebiten.TPS() == 0 {
        g.kanjiText = ""
        for j := 0; j < 6; j++ {
            for i := 0; i < 12; i++ {
                g.kanjiText += string(jaKanjis[rand.IntN(len(jaKanjis))])
            }
            g.kanjiText += "\n"
        }

        g.kanjiTextColor.R = 0x80 + uint8(rand.IntN(0x7f))
        g.kanjiTextColor.G = 0x80 + uint8(rand.IntN(0x7f))
        g.kanjiTextColor.B = 0x80 + uint8(rand.IntN(0x7f))
        g.kanjiTextColor.A = 0xff
    }
    g.counter++
    return nil
}

func (g *Game) Draw(screen *ebiten.Image) {
    const (
        normalFontSize = 24
        bigFontSize    = 48
    )

    const x = 20

    // Draw info
    msg := fmt.Sprintf("TPS: %0.2f", ebiten.ActualTPS())
    op := &text.DrawOptions{}
    op.GeoM.Translate(x, 20)
    op.ColorScale.ScaleWithColor(color.White)
    text.Draw(screen, msg, &text.GoTextFace{
        Source: mplusFaceSource,
        Size:   normalFontSize,
    }, op)

    // Draw the sample text
    op = &text.DrawOptions{}
    op.GeoM.Translate(x, 60)
    op.ColorScale.ScaleWithColor(color.White)
    text.Draw(screen, sampleText, &text.GoTextFace{
        Source: mplusFaceSource,
        Size:   normalFontSize,
    }, op)

    op = &text.DrawOptions{}
    op.GeoM.Translate(x, 110)
    op.ColorScale.ScaleWithColor(g.kanjiTextColor)
    op.LineSpacing = bigFontSize * 1.2
    text.Draw(screen, g.kanjiText, &text.GoTextFace{
        Source: mplusFaceSource,
        Size:   bigFontSize,
    }, op)
}

func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
    return screenWidth, screenHeight
}

func main() {
    ebiten.SetWindowSize(screenWidth, screenHeight)
    ebiten.SetWindowTitle("Font (Ebitengine Demo)")
    if err := ebiten.RunGame(&Game{}); err != nil {
        log.Fatal(err)
    }
}

func init() {
    const table = `
Title: Chengdu's Mood Today: A Gentle Symphony of Serenity and Vibrancy
In the heart of southwestern China, where rolling hills meet bustling streets, Chengdu, the Panda Capital, unfolds its unique charm with a mood that is as intricate as it is enchanting. Today, Chengdu's mood is a delicate balance of tranquility and vibrancy, a symphony where ancient traditions harmonize with modern rhythms.
The morning sun casts a gentle glow over the city, its rays filtering through the lush greenery of the People's Park. Here, the mood is serene, as locals engage in their daily rituals – elders playing mahjong under the shade of towering trees, tea lovers savoring the fragrant brew while whispering tales of the past, and children laughing as they chase each other around the lush lawns. The park, a microcosm of Chengdu's soul, reflects the city's ability to embrace the pace of life that cherishes both the present and the past.
As the day progresses, Chengdu's mood transitions into a vibrant crescendo. The streets come alive with the sounds of commerce and chatter, as shops and street vendors open their doors to welcome eager customers. The scent of spicy Sichuan cuisine wafts through the air, inviting passersby to sample dishes that have been perfected over centuries. In the Jinli Ancient Street, tourists and locals alike stroll through narrow alleys lined with traditional architecture, their cameras capturing every intricate detail that embodies Chengdu's rich cultural heritage.
Yet, amidst this hustle and bustle, Chengdu retains its calm. The city's famous panda bases, like the Chengdu Research Base of Giant Panda Breeding, offer a serene escape where visitors can observe these adorable creatures in their natural habitats. The sight of pandas lazily munching on bamboo or playing in their enclosures brings a smile to everyone's face, reinforcing Chengdu's reputation as a haven for wildlife and nature lovers.
As evening descends, Chengdu's mood shifts once again, this time to a more relaxed and contemplative tone. The city's riverside areas, such as the Jinjiang River, become hotspots for evening strolls and casual gatherings. Lanterns illuminate the pathways, casting a warm, inviting glow that adds to the romantic ambiance. Bars and cafes fill with people seeking to unwind after a long day, their conversations blending into the city's melodic backdrop.
In essence, Chengdu's mood today is a testament to its unique ability to blend the tranquility of its historical roots with the vibrancy of its modern identity. It's a city where one can find both solace in the simplicity of daily life and excitement in its cultural richness and dynamic growth. Chengdu's mood, like its people, is warm, welcoming, and forever evolving, inviting everyone to experience its intricate harmony firsthand.
`
    for _, c := range table {
        if c == '\n' {
            continue
        }
        jaKanjis = append(jaKanjis, c)
    }
}

func (g *Game) Update() error {
    // Change the text color for each second.
    if g.counter%ebiten.TPS() == 0 {
        g.kanjiText = ""
        for j := 0; j < 6; j++ {
            for i := 0; i < 12; i++ {
                g.kanjiText += string(jaKanjis[rand.IntN(len(jaKanjis))])
            }
            g.kanjiText += "\n"
        }

        g.kanjiTextColor.R = 0x80 + uint8(rand.IntN(0x7f))
        g.kanjiTextColor.G = 0x80 + uint8(rand.IntN(0x7f))
        g.kanjiTextColor.B = 0x80 + uint8(rand.IntN(0x7f))
        g.kanjiTextColor.A = 0xff
    }
    g.counter++
    return nil
}