ebiten/examples/fontvector/main.go
2023-12-24 15:06:19 +09:00

106 lines
2.5 KiB
Go

// Copyright 2022 The Ebitengine 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 (
"bytes"
"image"
"image/color"
"log"
"math"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
"github.com/hajimehoshi/ebiten/v2/text/v2"
"github.com/hajimehoshi/ebiten/v2/vector"
)
var (
whiteImage = ebiten.NewImage(3, 3)
// whiteSubImage is an internal sub image of whiteImage.
// Use whiteSubImage at DrawTriangles instead of whiteImage in order to avoid bleeding edges.
whiteSubImage = whiteImage.SubImage(image.Rect(1, 1, 2, 2)).(*ebiten.Image)
)
func init() {
whiteImage.Fill(color.White)
}
const (
screenWidth = 640
screenHeight = 480
)
type Game struct {
path vector.Path
vertices []ebiten.Vertex
indices []uint16
tick int
}
func (g *Game) Update() error {
if g.tick == 0 {
s, err := text.NewGoTextFaceSource(bytes.NewReader(fonts.MPlus1pRegular_ttf))
if err != nil {
return err
}
op := &text.LayoutOptions{}
op.LineSpacing = 110
text.AppendVectorPath(&g.path, "ABCEDFG\nabcdefg\nあいうえお\nかきくけこ", &text.GoTextFace{
Source: s,
Size: 90,
}, op)
}
g.tick++
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
g.vertices = g.vertices[:0]
g.indices = g.indices[:0]
op := &vector.StrokeOptions{}
op.Width = 2*(float32(math.Sin(float64(g.tick)*2*math.Pi/180))+1) + 1
op.LineJoin = vector.LineJoinRound
op.LineCap = vector.LineCapRound
g.vertices, g.indices = g.path.AppendVerticesAndIndicesForStroke(g.vertices, g.indices, op)
for i := range g.vertices {
g.vertices[i].DstX += 50
g.vertices[i].DstY += 0
g.vertices[i].SrcX = 1
g.vertices[i].SrcY = 1
}
screen.DrawTriangles(g.vertices, g.indices, whiteSubImage, &ebiten.DrawTrianglesOptions{
AntiAlias: true,
})
}
func (*Game) Layout(width, height int) (int, int) {
return screenWidth, screenHeight
}
func main() {
ebiten.SetWindowTitle("Font Vector (Ebitengine Demo)")
if err := ebiten.RunGame(&Game{}); err != nil {
log.Fatal(err)
}
}