mirror of
https://github.com/hajimehoshi/ebiten.git
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135 lines
3.3 KiB
Go
135 lines
3.3 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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// +build example
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package common
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import (
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"image"
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"image/color"
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"image/draw"
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"math"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/examples/common/internal/assets"
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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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origImage image.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 (f *Font) TextHeight(str string) int {
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// TODO: Take care about '\n'
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return f.charHeight
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}
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func init() {
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img := assets.ArcadeFontImage()
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eimg, _ := ebiten.NewImageFromImage(img, ebiten.FilterNearest)
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ArcadeFont = &Font{eimg, img, 32, 16, 8, 8}
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}
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type part struct {
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sx, sy, dx0, dy0, dx1, dy1 int
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}
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func (f *Font) parts(str string) []part {
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ps := []part{}
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x := 0
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y := 0
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for _, c := range str {
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if c == '\n' {
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x = 0
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y += f.charHeight
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continue
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}
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sx := (int(c) % f.charNumPerLine) * f.charWidth
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sy := ((int(c) - f.offset) / f.charNumPerLine) * f.charHeight
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dx0 := x
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dy0 := y
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dx1 := dx0 + f.charWidth
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dy1 := dy0 + f.charHeight
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ps = append(ps, part{sx, sy, dx0, dy0, dx1, dy1})
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x += f.charWidth
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}
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return ps
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}
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func (f *Font) DrawText(rt *ebiten.Image, str string, ox, oy, scale int, c color.Color) {
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op := &ebiten.DrawImageOptions{}
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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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op.ColorM.Scale(r, g, b, a)
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// TODO: There is same logic in parts. Refactor this.
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x := 0
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y := 0
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for _, c := range str {
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if c == '\n' {
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x = 0
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y += f.charHeight
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continue
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}
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sx := (int(c) % f.charNumPerLine) * f.charWidth
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sy := ((int(c) - f.offset) / f.charNumPerLine) * f.charHeight
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r := image.Rect(sx, sy, sx+f.charWidth, sy+f.charHeight)
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op.SourceRect = &r
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op.GeoM.Reset()
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op.GeoM.Translate(float64(x), float64(y))
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op.GeoM.Scale(float64(scale), float64(scale))
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op.GeoM.Translate(float64(ox), float64(oy))
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rt.DrawImage(f.image, op)
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x += f.charWidth
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}
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}
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func (f *Font) DrawTextOnImage(rt draw.Image, str string, ox, oy int) {
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// TODO: This function is needed only by examples/keyboard/keyboard.
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// This is executed without Ebiten, so ebiten.Image can't be used.
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// When ebiten.Image can be used without ebiten.Run, this function can be removed.
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for _, p := range f.parts(str) {
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draw.Draw(rt, image.Rect(p.dx0+ox, p.dy0+oy, p.dx1+ox, p.dy1+oy),
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f.origImage, image.Pt(p.sx, p.sy), draw.Over)
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}
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}
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func (f *Font) DrawTextWithShadow(rt *ebiten.Image, str string, x, y, scale int, clr color.Color) {
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f.DrawText(rt, str, x+1, y+1, scale, color.NRGBA{0, 0, 0, 0x80})
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f.DrawText(rt, str, x, y, scale, clr)
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}
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