mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
135 lines
3.3 KiB
Go
135 lines
3.3 KiB
Go
// 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.
|
|
|
|
// +build example
|
|
|
|
package common
|
|
|
|
import (
|
|
"image"
|
|
"image/color"
|
|
"image/draw"
|
|
"math"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/examples/common/internal/assets"
|
|
)
|
|
|
|
var (
|
|
ArcadeFont *Font
|
|
)
|
|
|
|
type Font struct {
|
|
image *ebiten.Image
|
|
origImage image.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 (f *Font) TextHeight(str string) int {
|
|
// TODO: Take care about '\n'
|
|
return f.charHeight
|
|
}
|
|
|
|
func init() {
|
|
img := assets.ArcadeFontImage()
|
|
eimg, _ := ebiten.NewImageFromImage(img, ebiten.FilterNearest)
|
|
ArcadeFont = &Font{eimg, img, 32, 16, 8, 8}
|
|
}
|
|
|
|
type part struct {
|
|
sx, sy, dx0, dy0, dx1, dy1 int
|
|
}
|
|
|
|
func (f *Font) parts(str string) []part {
|
|
ps := []part{}
|
|
x := 0
|
|
y := 0
|
|
for _, c := range str {
|
|
if c == '\n' {
|
|
x = 0
|
|
y += f.charHeight
|
|
continue
|
|
}
|
|
sx := (int(c) % f.charNumPerLine) * f.charWidth
|
|
sy := ((int(c) - f.offset) / f.charNumPerLine) * f.charHeight
|
|
dx0 := x
|
|
dy0 := y
|
|
dx1 := dx0 + f.charWidth
|
|
dy1 := dy0 + f.charHeight
|
|
ps = append(ps, part{sx, sy, dx0, dy0, dx1, dy1})
|
|
x += f.charWidth
|
|
}
|
|
return ps
|
|
}
|
|
|
|
func (f *Font) DrawText(rt *ebiten.Image, str string, ox, oy, scale int, c color.Color) {
|
|
op := &ebiten.DrawImageOptions{}
|
|
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
|
|
}
|
|
op.ColorM.Scale(r, g, b, a)
|
|
|
|
// TODO: There is same logic in parts. Refactor this.
|
|
x := 0
|
|
y := 0
|
|
for _, c := range str {
|
|
if c == '\n' {
|
|
x = 0
|
|
y += f.charHeight
|
|
continue
|
|
}
|
|
sx := (int(c) % f.charNumPerLine) * f.charWidth
|
|
sy := ((int(c) - f.offset) / f.charNumPerLine) * f.charHeight
|
|
r := image.Rect(sx, sy, sx+f.charWidth, sy+f.charHeight)
|
|
op.SourceRect = &r
|
|
op.GeoM.Reset()
|
|
op.GeoM.Translate(float64(x), float64(y))
|
|
op.GeoM.Scale(float64(scale), float64(scale))
|
|
op.GeoM.Translate(float64(ox), float64(oy))
|
|
rt.DrawImage(f.image, op)
|
|
x += f.charWidth
|
|
}
|
|
}
|
|
|
|
func (f *Font) DrawTextOnImage(rt draw.Image, str string, ox, oy int) {
|
|
// TODO: This function is needed only by examples/keyboard/keyboard.
|
|
// This is executed without Ebiten, so ebiten.Image can't be used.
|
|
// When ebiten.Image can be used without ebiten.Run, this function can be removed.
|
|
for _, p := range f.parts(str) {
|
|
draw.Draw(rt, image.Rect(p.dx0+ox, p.dy0+oy, p.dx1+ox, p.dy1+oy),
|
|
f.origImage, image.Pt(p.sx, p.sy), draw.Over)
|
|
}
|
|
}
|
|
|
|
func (f *Font) DrawTextWithShadow(rt *ebiten.Image, str string, x, y, scale int, clr color.Color) {
|
|
f.DrawText(rt, str, x+1, y+1, scale, color.NRGBA{0, 0, 0, 0x80})
|
|
f.DrawText(rt, str, x, y, scale, clr)
|
|
}
|