100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
package UI
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import (
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"image/color"
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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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// LabelAlignment represents a label's alignment
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type LabelAlignment uint8
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const (
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// LabelAlignLeft represents a left-aligned label
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LabelAlignLeft LabelAlignment = 0
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// LabelAlignCenter represents a center-aligned label
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LabelAlignCenter LabelAlignment = 1
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// LabelAlignRight represents a right-aligned label
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LabelAlignRight LabelAlignment = 2
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)
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// Label represents a user interface label
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type Label 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 LabelAlignment
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font *Font
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imageData *ebiten.Image
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Color color.Color
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}
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// CreateLabel creates a new instance of a UI label
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func CreateLabel(provider Common.FileProvider, font string, palette PaletteDefs.PaletteType) *Label {
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result := &Label{
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Alignment: LabelAlignLeft,
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Color: color.White,
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font: GetFont(font, palette, provider),
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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 *Label) 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 == LabelAlignCenter {
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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 == LabelAlignRight {
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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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// MoveTo moves the label to the specified location
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func (v *Label) 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 *Label) 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.font.GetTextMetrics(v.text)
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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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v.font.Draw(0, 0, v.text, v.Color, v.imageData)
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}
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// SetText sets the label's text
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func (v *Label) 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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// GetSize returns the size of the label
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func (v *Label) GetSize() (width, height uint32) {
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v.cacheImage()
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width = v.Width
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height = v.Height
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return
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}
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