104 lines
2.3 KiB
Go
104 lines
2.3 KiB
Go
package OpenDiablo2
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import (
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"image/color"
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"github.com/essial/OpenDiablo2/Palettes"
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"github.com/hajimehoshi/ebiten"
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)
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type UILabelAlignment uint8
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const (
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UILabelAlignLeft UILabelAlignment = 0
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UILabelAlignCenter UILabelAlignment = 1
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UILabelAlignRight UILabelAlignment = 2
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)
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type UILabel struct {
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text string
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X int
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Y int
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Width uint32
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Height uint32
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Alignment UILabelAlignment
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font *MPQFont
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imageData *ebiten.Image
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ColorMod color.Color
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}
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// CreateUILabel creates a new instance of a UI label
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func CreateUILabel(engine *Engine, font string, palette Palettes.Palette) *UILabel {
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result := &UILabel{
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Alignment: UILabelAlignLeft,
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ColorMod: nil,
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font: engine.GetFont(font, palette),
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}
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return result
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}
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// Draw draws the label on the screen
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func (v *UILabel) Draw(target *ebiten.Image) {
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if len(v.text) == 0 {
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return
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}
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v.cacheImage()
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opts := &ebiten.DrawImageOptions{}
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if v.Alignment == UILabelAlignCenter {
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opts.GeoM.Translate(float64(v.X-int(v.Width/2)), float64(v.Y))
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} else if v.Alignment == UILabelAlignRight {
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opts.GeoM.Translate(float64(v.X-int(v.Width)), float64(v.Y))
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} else {
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opts.GeoM.Translate(float64(v.X), float64(v.Y))
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}
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opts.CompositeMode = ebiten.CompositeModeSourceAtop
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opts.Filter = ebiten.FilterNearest
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target.DrawImage(v.imageData, opts)
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}
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func (v *UILabel) calculateSize() (uint32, uint32) {
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width := uint32(0)
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height := uint32(0)
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for _, ch := range v.text {
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metric := v.font.Metrics[uint8(ch)]
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width += uint32(metric.Width)
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height = Max(height, uint32(metric.Height))
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}
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return width, height
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}
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func (v *UILabel) MoveTo(x, y int) {
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v.X = x
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v.Y = y
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}
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func (v *UILabel) cacheImage() {
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if v.imageData != nil {
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return
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}
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width, height := v.calculateSize()
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v.Width = width
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v.Height = height
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v.imageData, _ = ebiten.NewImage(int(width), int(height), ebiten.FilterNearest)
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x := uint32(0)
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v.font.FontSprite.ColorMod = v.ColorMod
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for _, ch := range v.text {
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char := uint8(ch)
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metric := v.font.Metrics[char]
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v.font.FontSprite.Frame = char
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v.font.FontSprite.MoveTo(int(x), int(height))
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v.font.FontSprite.Draw(v.imageData)
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x += uint32(metric.Width)
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}
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}
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func (v *UILabel) SetText(newText string) {
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if v.text == newText {
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return
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}
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v.text = newText
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v.imageData = nil
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}
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