mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-21 22:02:23 +02:00
87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
// Copyright 2014 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 blocks
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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"
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"image/color"
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"math"
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)
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var imageFont *ebiten.Image
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func init() {
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var err error
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imageFont, _, err = ebitenutil.NewImageFromFile("images/blocks/font.png", ebiten.FilterNearest)
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if err != nil {
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panic(err)
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}
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}
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const charWidth = 8
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const charHeight = 8
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func textWidth(str string) int {
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return charWidth * len(str)
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}
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func drawText(rt *ebiten.Image, str string, ox, oy, scale int, c color.Color) error {
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parts := []ebiten.ImagePart{}
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locationX, locationY := 0, 0
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for _, c := range str {
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if c == '\n' {
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locationX = 0
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locationY += charHeight
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continue
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}
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code := int(c)
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x := (code % 16) * charWidth
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y := ((code - 32) / 16) * charHeight
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parts = append(parts, ebiten.ImagePart{
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Dst: image.Rect(locationX, locationY, locationX+charWidth, locationY+charHeight),
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Src: image.Rect(x, y, x+charWidth, y+charHeight),
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})
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locationX += charWidth
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}
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geo := ebiten.ScaleGeo(float64(scale), float64(scale))
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geo.Concat(ebiten.TranslateGeo(float64(ox), float64(oy)))
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c2 := color.NRGBA64Model.Convert(c).(color.NRGBA64)
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const max = math.MaxUint16
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r := float64(c2.R) / max
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g := float64(c2.G) / max
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b := float64(c2.B) / max
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a := float64(c2.A) / max
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clr := ebiten.ScaleColor(r, g, b, a)
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return rt.DrawImage(imageFont, &ebiten.DrawImageOptions{
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Parts: parts,
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GeoM: geo,
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ColorM: clr,
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})
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}
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func drawTextWithShadow(rt *ebiten.Image, str string, x, y, scale int, clr color.Color) error {
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if err := 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 := 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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