ebiten/examples/font/main.go

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// Copyright 2016 Hajime Hoshi
//
// 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.
// +build example
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package main
import (
"image"
"io/ioutil"
"log"
"github.com/golang/freetype/truetype"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"golang.org/x/image/font"
"golang.org/x/image/math/fixed"
)
const (
screenWidth = 640
screenHeight = 480
)
var (
textImage *ebiten.Image
)
var text = []string{
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"The quick brown fox jumps over the lazy dog.",
"",
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// A head part of a Japanese novel 山月記 (Sangetsuki)
// See http://www.aozora.gr.jp/cards/000119/files/624_14544.html.
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"隴西の李徴は博学才穎、天宝の末年、",
"若くして名を虎榜に連ね、",
"ついで江南尉に補せられたが、",
"性、狷介、自ら恃むところ頗厚く、",
"賤吏に甘んずるを潔しとしなかった。",
}
func parseFont() error {
f, err := ebitenutil.OpenFile("_resources/fonts/mplus-1p-regular.ttf")
if err != nil {
return err
}
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defer func() {
_ = f.Close()
}()
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b, err := ioutil.ReadAll(f)
if err != nil {
return err
}
tt, err := truetype.Parse(b)
if err != nil {
return err
}
w, h := textImage.Size()
dst := image.NewRGBA(image.Rect(0, 0, w, h))
const size = 24
const dpi = 72
d := &font.Drawer{
Dst: dst,
Src: image.White,
Face: truetype.NewFace(tt, &truetype.Options{
Size: size,
DPI: dpi,
Hinting: font.HintingFull,
}),
}
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y := size
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for _, s := range text {
d.Dot = fixed.P(0, y)
d.DrawString(s)
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y += size
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}
textImage.ReplacePixels(dst.Pix)
return nil
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}
func update(screen *ebiten.Image) error {
screen.DrawImage(textImage, &ebiten.DrawImageOptions{})
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return nil
}
func main() {
textImage, _ = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
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if err := parseFont(); err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Font (Ebiten Demo)"); err != nil {
log.Fatal(err)
}
}