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.
package main
import (
"image/color"
"log"
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"math"
"strings"
"golang.org/x/image/font"
"golang.org/x/image/font/opentype"
"golang.org/x/image/math/fixed"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
"github.com/hajimehoshi/ebiten/v2/text"
"github.com/hajimehoshi/ebiten/v2/vector"
)
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.HintingVertical,
})
if err != nil {
log.Fatal(err)
}
mplusBigFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
Size: 32,
DPI: dpi,
Hinting: font.HintingVertical,
})
if err != nil {
log.Fatal(err)
}
}
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 boundString(face font.Face, str string) fixed.Rectangle26_6 {
str = strings.TrimRight(str, "\n")
lines := strings.Split(str, "\n")
if len(lines) == 0 {
return fixed.Rectangle26_6{}
}
minX := fixed.I(0)
maxX := fixed.I(0)
for _, line := range lines {
a := font.MeasureString(face, line)
if maxX < a {
maxX = a
}
}
m := face.Metrics()
minY := -m.Ascent
maxY := fixed.Int26_6(len(lines)-1)*m.Height + m.Descent
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return fixed.Rectangle26_6{Min: fixed.Point26_6{X: minX, Y: minY}, Max: fixed.Point26_6{X: maxX, Y: maxY}}
}
func fixed26_6ToFloat32(x fixed.Int26_6) float32 {
return float32(x>>6) + float32(x&((1<<6)-1))/(1<<6)
}
func (g *Game) Draw(screen *ebiten.Image) {
gray := color.RGBA{0x80, 0x80, 0x80, 0xff}
{
const x, y = 20, 40
b := boundString(mplusNormalFont, sampleText)
vector.DrawFilledRect(screen, fixed26_6ToFloat32(b.Min.X)+x, fixed26_6ToFloat32(b.Min.Y)+y, fixed26_6ToFloat32(b.Max.X-b.Min.X), fixed26_6ToFloat32(b.Max.Y-b.Min.Y), gray, false)
text.Draw(screen, sampleText, mplusNormalFont, x, y, color.White)
}
{
const x, y = 20, 140
b := boundString(mplusBigFont, sampleText)
vector.DrawFilledRect(screen, fixed26_6ToFloat32(b.Min.X)+x, fixed26_6ToFloat32(b.Min.Y)+y, fixed26_6ToFloat32(b.Max.X-b.Min.X), fixed26_6ToFloat32(b.Max.Y-b.Min.Y), gray, false)
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 := boundString(text.FaceWithLineHeight(mplusBigFont, lineHeight), sampleText)
vector.DrawFilledRect(screen, fixed26_6ToFloat32(b.Min.X)+x, fixed26_6ToFloat32(b.Min.Y)+y, fixed26_6ToFloat32(b.Max.X-b.Min.X), fixed26_6ToFloat32(b.Max.Y-b.Min.Y), gray, false)
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.ColorScale.Reset()
r := float32(1)
if i%3 == 0 {
r = 0.5
}
g := float32(1)
if i%3 == 1 {
g = 0.5
}
b := float32(1)
if i%3 == 2 {
b = 0.5
}
op.ColorScale.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)
}
}