ebiten/examples/text/main.go

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// Copyright 2020 The Ebiten Authors
//
// 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.
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//go:build example
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// +build example
package main
import (
"image/color"
"log"
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"math"
"math/rand"
"time"
"golang.org/x/image/font"
"golang.org/x/image/font/opentype"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
"github.com/hajimehoshi/ebiten/v2/text"
)
const (
screenWidth = 640
screenHeight = 480
)
const sampleText = ` The quick brown fox jumps
over the lazy dog.`
var (
mplusNormalFont font.Face
mplusBigFont font.Face
)
func init() {
tt, err := opentype.Parse(fonts.MPlus1pRegular_ttf)
if err != nil {
log.Fatal(err)
}
const dpi = 72
mplusNormalFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
Size: 24,
DPI: dpi,
Hinting: font.HintingFull,
})
if err != nil {
log.Fatal(err)
}
mplusBigFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
Size: 32,
DPI: dpi,
Hinting: font.HintingFull,
})
if err != nil {
log.Fatal(err)
}
}
func init() {
rand.Seed(time.Now().UnixNano())
}
type Game struct {
counter int
kanjiText []rune
kanjiTextColor color.RGBA
glyphs []text.Glyph
}
func (g *Game) Update() error {
// Initialize the glyphs for special (colorful) rendering.
if len(g.glyphs) == 0 {
g.glyphs = text.AppendGlyphs(g.glyphs, mplusNormalFont, sampleText)
}
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
gray := color.RGBA{0x80, 0x80, 0x80, 0xff}
{
const x, y = 20, 40
b := text.BoundString(mplusNormalFont, sampleText)
ebitenutil.DrawRect(screen, float64(b.Min.X+x), float64(b.Min.Y+y), float64(b.Dx()), float64(b.Dy()), gray)
text.Draw(screen, sampleText, mplusNormalFont, x, y, color.White)
}
{
const x, y = 20, 140
b := text.BoundString(mplusBigFont, sampleText)
ebitenutil.DrawRect(screen, float64(b.Min.X+x), float64(b.Min.Y+y), float64(b.Dx()), float64(b.Dy()), gray)
text.Draw(screen, sampleText, mplusBigFont, x, y, color.White)
}
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{
const x, y = 20, 240
op := &ebiten.DrawImageOptions{}
op.GeoM.Rotate(math.Pi / 4)
op.GeoM.Translate(x, y)
op.Filter = ebiten.FilterLinear
text.DrawWithOptions(screen, sampleText, mplusNormalFont, op)
}
{
const x, y = 160, 240
const lineHeight = 80
b := text.BoundString(text.FaceWithLineHeight(mplusBigFont, lineHeight), sampleText)
ebitenutil.DrawRect(screen, float64(b.Min.X+x), float64(b.Min.Y+y), float64(b.Dx()), float64(b.Dy()), gray)
text.Draw(screen, sampleText, text.FaceWithLineHeight(mplusBigFont, lineHeight), x, y, color.White)
}
{
const x, y = 240, 400
op := &ebiten.DrawImageOptions{}
// g.glyphs is initialized by text.AppendGlyphs.
// You can customize how to render each glyph.
// In this example, multiple colors are used to render glyphs.
for i, gl := range g.glyphs {
op.GeoM.Reset()
op.GeoM.Translate(x, y)
op.GeoM.Translate(gl.X, gl.Y)
op.ColorM.Reset()
r := 1.0
if i%3 == 0 {
r = 0.5
}
g := 1.0
if i%3 == 1 {
g = 0.5
}
b := 1.0
if i%3 == 2 {
b = 0.5
}
op.ColorM.Scale(r, g, b, 1)
screen.DrawImage(gl.Image, op)
}
}
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
}
func main() {
ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Text (Ebitengine Demo)")
if err := ebiten.RunGame(&Game{}); err != nil {
log.Fatal(err)
}
}