mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
// Copyright 2015 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package internal
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import (
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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"image/color"
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"math"
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"strings"
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)
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var (
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ArcadeFont *Font
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)
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type Font struct {
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image *ebiten.Image
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offset int
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charNumPerLine int
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charWidth int
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charHeight int
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}
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func (f *Font) TextWidth(str string) int {
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// TODO: Take care about '\n'
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return f.charWidth * len(str)
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}
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func init() {
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arcadeFontImage, _, err := ebitenutil.NewImageFromFile("images/arcadefont.png", ebiten.FilterNearest)
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if err != nil {
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panic(err)
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}
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ArcadeFont = &Font{arcadeFontImage, 32, 16, 8, 8}
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}
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type fontImageParts struct {
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str string
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font *Font
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}
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func (f *fontImageParts) Len() int {
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return len(f.str)
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}
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func (f *fontImageParts) Dst(i int) (x0, y0, x1, y1 int) {
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x := i - strings.LastIndex(f.str[:i], "\n") - 1
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y := strings.Count(f.str[:i], "\n")
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x *= f.font.charWidth
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y *= f.font.charHeight
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if x < 0 {
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return 0, 0, 0, 0
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}
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return x, y, x + f.font.charWidth, y + f.font.charHeight
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}
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func (f *fontImageParts) Src(i int) (x0, y0, x1, y1 int) {
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code := int(f.str[i])
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if code == '\n' {
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return 0, 0, 0, 0
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}
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x := (code % f.font.charNumPerLine) * f.font.charWidth
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y := ((code - f.font.offset) / f.font.charNumPerLine) * f.font.charHeight
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return x, y, x + f.font.charWidth, y + f.font.charHeight
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}
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func (f *Font) DrawText(rt *ebiten.Image, str string, ox, oy, scale int, c color.Color) error {
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options := &ebiten.DrawImageOptions{
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ImageParts: &fontImageParts{str, f},
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}
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options.GeoM.Scale(float64(scale), float64(scale))
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options.GeoM.Translate(float64(ox), float64(oy))
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ur, ug, ub, ua := c.RGBA()
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const max = math.MaxUint16
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r := float64(ur) / max
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g := float64(ug) / max
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b := float64(ub) / max
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a := float64(ua) / max
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if 0 < a {
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r /= a
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g /= a
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b /= a
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}
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options.ColorM.Scale(r, g, b, a)
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return rt.DrawImage(f.image, options)
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}
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func (f *Font) DrawTextWithShadow(rt *ebiten.Image, str string, x, y, scale int, clr color.Color) error {
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if err := f.DrawText(rt, str, x+1, y+1, scale, color.NRGBA{0, 0, 0, 0x80}); err != nil {
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return err
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}
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if err := f.DrawText(rt, str, x, y, scale, clr); err != nil {
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return err
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}
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return nil
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}
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