116 lines
2.8 KiB
Go
116 lines
2.8 KiB
Go
package UI
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import (
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"image/color"
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"strings"
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"github.com/OpenDiablo2/OpenDiablo2/Common"
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"github.com/OpenDiablo2/OpenDiablo2/PaletteDefs"
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"github.com/hajimehoshi/ebiten"
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)
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var fontCache = map[string]*Font{}
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// FontSize represents the size of a character in a font
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type FontSize struct {
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Width uint8
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Height uint8
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}
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// Font represents a font
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type Font struct {
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fontSprite *Common.Sprite
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metrics map[uint8]FontSize
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}
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// GetFont creates or loads an existing font
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func GetFont(font string, palette PaletteDefs.PaletteType, fileProvider Common.FileProvider) *Font {
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cacheItem, exists := fontCache[font+"_"+string(palette)]
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if exists {
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return cacheItem
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}
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newFont := CreateFont(font, palette, fileProvider)
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fontCache[font+"_"+string(palette)] = newFont
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return newFont
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}
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// CreateFont creates an instance of a MPQ Font
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func CreateFont(font string, palette PaletteDefs.PaletteType, fileProvider Common.FileProvider) *Font {
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result := &Font{
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metrics: make(map[uint8]FontSize),
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}
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result.fontSprite = fileProvider.LoadSprite(font+".dc6", palette)
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woo := "Woo!\x01"
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fontData := fileProvider.LoadFile(font + ".tbl")
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if string(fontData[0:5]) != woo {
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panic("No woo :(")
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}
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for i := 12; i < len(fontData); i += 14 {
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fontSize := FontSize{
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Width: fontData[i+3],
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Height: fontData[i+4],
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}
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result.metrics[fontData[i+8]] = fontSize
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}
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return result
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}
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// GetTextMetrics returns the size of the specified text
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func (v *Font) GetTextMetrics(text string) (width, height uint32) {
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width = uint32(0)
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curWidth := uint32(0)
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height = uint32(0)
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maxCharHeight := uint32(0)
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for _, m := range v.fontSprite.Frames {
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maxCharHeight = Common.Max(maxCharHeight, uint32(m.Height))
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}
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for i := 0; i < len(text); i++ {
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ch := text[i]
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if ch == '\n' {
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width = Common.Max(width, curWidth)
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curWidth = 0
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height += maxCharHeight + 6
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continue
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}
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metric := v.metrics[uint8(ch)]
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curWidth += uint32(metric.Width)
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}
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width = Common.Max(width, curWidth)
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height += maxCharHeight
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return
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}
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// Draw draws the font on the target surface
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func (v *Font) Draw(x, y int, text string, color color.Color, target *ebiten.Image) {
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v.fontSprite.ColorMod = color
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v.fontSprite.Blend = false
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maxCharHeight := uint32(0)
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for _, m := range v.metrics {
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maxCharHeight = Common.Max(maxCharHeight, uint32(m.Height))
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}
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targetWidth, _ := target.Size()
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lines := strings.Split(text, "\n")
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for lineIdx, line := range lines {
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lineWidth, _ := v.GetTextMetrics(line)
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xPos := x + ((targetWidth / 2) - int(lineWidth/2))
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for _, ch := range line {
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char := uint8(ch)
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metric := v.metrics[char]
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v.fontSprite.Frame = char
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v.fontSprite.MoveTo(xPos, y+int(v.fontSprite.Frames[char].Height))
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v.fontSprite.Draw(target)
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xPos += int(metric.Width)
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}
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if lineIdx >= len(lines)-1 {
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break
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}
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xPos = x
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y += int(maxCharHeight + 6)
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}
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}
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