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Add example/internal and move font rendering into it

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Hajime Hoshi 2015-01-18 14:31:21 +09:00
parent 0bd0a4dbc2
commit a5e335819d
8 changed files with 126 additions and 93 deletions
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0
_docs/public/example/images/blocks/font.png → _docs/public/example/images/arcadefont.png
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2
_docs/public/example/images/license.md
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@ -1,6 +1,6 @@
# License
## blocks/font.png
## arcadefont.png
```
9031 Font ReadMe

90
example/blocks/blocks/font.go
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@ -16,98 +16,18 @@ package blocks
import (
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/hajimehoshi/ebiten/example/internal"
"image/color"
"math"
"strings"
)
var imageFont *ebiten.Image
func init() {
var err error
imageFont, _, err = ebitenutil.NewImageFromFile("images/blocks/font.png", ebiten.FilterNearest)
if err != nil {
panic(err)
}
}
const charWidth = 8
const charHeight = 8
func textWidth(str string) int {
// TODO: Take care about '\n'
return charWidth * len(str)
}
type fontImageParts string
func (f fontImageParts) Len() int {
return len(f)
}
func (f fontImageParts) Dst(i int) (x0, y0, x1, y1 int) {
x := i - strings.LastIndex(string(f)[:i], "\n") - 1
y := strings.Count(string(f)[:i], "\n")
x *= charWidth
y *= charHeight
if x < 0 {
return 0, 0, 0, 0
}
return x, y, x + charWidth, y + charHeight
}
func (f fontImageParts) Src(i int) (x0, y0, x1, y1 int) {
code := int(f[i])
if code == '\n' {
return 0, 0, 0, 0
}
x := (code % 16) * charWidth
y := ((code - 32) / 16) * charHeight
return x, y, x + charWidth, y + charHeight
}
func drawText(rt *ebiten.Image, str string, ox, oy, scale int, c color.Color) error {
options := &ebiten.DrawImageOptions{
ImageParts: fontImageParts(str),
}
options.GeoM.Scale(float64(scale), float64(scale))
options.GeoM.Translate(float64(ox), float64(oy))
ur, ug, ub, ua := c.RGBA()
const max = math.MaxUint16
r := float64(ur) / max
g := float64(ug) / max
b := float64(ub) / max
a := float64(ua) / max
if 0 < a {
r /= a
g /= a
b /= a
}
options.ColorM.Scale(r, g, b, a)
return rt.DrawImage(imageFont, options)
}
func drawTextWithShadow(rt *ebiten.Image, str string, x, y, scale int, clr color.Color) error {
if err := drawText(rt, str, x+1, y+1, scale, color.NRGBA{0, 0, 0, 0x80}); err != nil {
return err
}
if err := drawText(rt, str, x, y, scale, clr); err != nil {
return err
}
return nil
}
func drawTextWithShadowCenter(rt *ebiten.Image, str string, x, y, scale int, clr color.Color, width int) error {
w := textWidth(str) * scale
w := internal.ArcadeFont.TextWidth(str) * scale
x += (width - w) / 2
return drawTextWithShadow(rt, str, x, y, scale, clr)
return internal.ArcadeFont.DrawTextWithShadow(rt, str, x, y, scale, clr)
}
func drawTextWithShadowRight(rt *ebiten.Image, str string, x, y, scale int, clr color.Color, width int) error {
w := textWidth(str) * scale
w := internal.ArcadeFont.TextWidth(str) * scale
x += width - w
return drawTextWithShadow(rt, str, x, y, scale, clr)
return internal.ArcadeFont.DrawTextWithShadow(rt, str, x, y, scale, clr)
}

5
example/blocks/blocks/gamescene.go
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@ -17,6 +17,7 @@ package blocks
import (
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/hajimehoshi/ebiten/example/internal"
"image/color"
_ "image/jpeg"
"math/rand"
@ -84,7 +85,7 @@ func init() {
}
// Windows: Next
x, y = nextWindowLabelPosition()
if err := drawTextWithShadow(imageWindows, "NEXT", x, y, 1, fontColor); err != nil {
if err := internal.ArcadeFont.DrawTextWithShadow(imageWindows, "NEXT", x, y, 1, fontColor); err != nil {
panic(err)
}
x, y = nextWindowPosition()
@ -126,7 +127,7 @@ func drawWindow(r *ebiten.Image, x, y, width, height int) error {
var fontColor = color.NRGBA{0x40, 0x40, 0xff, 0xff}
func drawTextBox(r *ebiten.Image, label string, x, y, width int) error {
if err := drawTextWithShadow(r, label, x, y, 1, fontColor); err != nil {
if err := internal.ArcadeFont.DrawTextWithShadow(r, label, x, y, 1, fontColor); err != nil {
return err
}
y += blockWidth

9
example/blocks/blocks/titlescene.go
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@ -17,6 +17,7 @@ package blocks
import (
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/hajimehoshi/ebiten/example/internal"
"image/color"
)
@ -83,9 +84,9 @@ func (s *TitleScene) Draw(r *ebiten.Image) error {
}
message := "PRESS SPACE TO START"
x := (ScreenWidth - textWidth(message)) / 2
x := (ScreenWidth - internal.ArcadeFont.TextWidth(message)) / 2
y := ScreenHeight - 48
return drawTextWithShadow(r, message, x, y, 1, color.NRGBA{0x80, 0, 0, 0xff})
return internal.ArcadeFont.DrawTextWithShadow(r, message, x, y, 1, color.NRGBA{0x80, 0, 0, 0xff})
}
func (s *TitleScene) drawTitleBackground(r *ebiten.Image, c int) error {
@ -97,8 +98,8 @@ func (s *TitleScene) drawTitleBackground(r *ebiten.Image, c int) error {
func drawLogo(r *ebiten.Image, str string) error {
scale := 4
textWidth := textWidth(str) * scale
textWidth := internal.ArcadeFont.TextWidth(str) * scale
x := (ScreenWidth - textWidth) / 2
y := 32
return drawTextWithShadow(r, str, x, y, scale, color.NRGBA{0x00, 0x00, 0x80, 0xff})
return internal.ArcadeFont.DrawTextWithShadow(r, str, x, y, scale, color.NRGBA{0x00, 0x00, 0x80, 0xff})
}

0
example/images/blocks/font.png → example/images/arcadefont.png
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2
example/images/license.md
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@ -1,6 +1,6 @@
# License
## blocks/font.png
## arcadefont.png
```
9031 Font ReadMe

111
example/internal/font.go Normal file
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@ -0,0 +1,111 @@
// Copyright 2015 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.
package internal
import (
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"image/color"
"math"
"strings"
)
var (
ArcadeFont *Font
)
type Font struct {
image *ebiten.Image
offset int
charNumPerLine int
charWidth int
charHeight int
}
func (f *Font) TextWidth(str string) int {
// TODO: Take care about '\n'
return f.charWidth * len(str)
}
func init() {
arcadeFontImage, _, err := ebitenutil.NewImageFromFile("images/arcadefont.png", ebiten.FilterNearest)
if err != nil {
panic(err)
}
ArcadeFont = &Font{arcadeFontImage, 32, 16, 8, 8}
}
type fontImageParts struct {
str string
font *Font
}
func (f *fontImageParts) Len() int {
return len(f.str)
}
func (f *fontImageParts) Dst(i int) (x0, y0, x1, y1 int) {
x := i - strings.LastIndex(f.str[:i], "\n") - 1
y := strings.Count(f.str[:i], "\n")
x *= f.font.charWidth
y *= f.font.charHeight
if x < 0 {
return 0, 0, 0, 0
}
return x, y, x + f.font.charWidth, y + f.font.charHeight
}
func (f *fontImageParts) Src(i int) (x0, y0, x1, y1 int) {
code := int(f.str[i])
if code == '\n' {
return 0, 0, 0, 0
}
x := (code % f.font.charNumPerLine) * f.font.charWidth
y := ((code - f.font.offset) / f.font.charNumPerLine) * f.font.charHeight
return x, y, x + f.font.charWidth, y + f.font.charHeight
}
func (f *Font) DrawText(rt *ebiten.Image, str string, ox, oy, scale int, c color.Color) error {
options := &ebiten.DrawImageOptions{
ImageParts: &fontImageParts{str, f},
}
options.GeoM.Scale(float64(scale), float64(scale))
options.GeoM.Translate(float64(ox), float64(oy))
ur, ug, ub, ua := c.RGBA()
const max = math.MaxUint16
r := float64(ur) / max
g := float64(ug) / max
b := float64(ub) / max
a := float64(ua) / max
if 0 < a {
r /= a
g /= a
b /= a
}
options.ColorM.Scale(r, g, b, a)
return rt.DrawImage(f.image, options)
}
func (f *Font) DrawTextWithShadow(rt *ebiten.Image, str string, x, y, scale int, clr color.Color) error {
if err := f.DrawText(rt, str, x+1, y+1, scale, color.NRGBA{0, 0, 0, 0x80}); err != nil {
return err
}
if err := f.DrawText(rt, str, x, y, scale, clr); err != nil {
return err
}
return nil
}