104 lines
2.2 KiB
Go
104 lines
2.2 KiB
Go
package d2ui
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import (
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"image/color"
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"github.com/OpenDiablo2/OpenDiablo2/d2core/d2render"
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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 int
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Height int
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Alignment LabelAlignment
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font *Font
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imageData d2render.Surface
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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(fontPath, palettePath string) 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(fontPath, palettePath),
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}
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return result
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}
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// Render draws the label on the screen
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func (v *Label) Render(target d2render.Surface) {
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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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x, y := v.X, v.Y
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if v.Alignment == LabelAlignCenter {
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x, y = v.X-v.Width/2, v.Y
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} else if v.Alignment == LabelAlignRight {
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x, y = v.X-v.Width, v.Y
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}
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target.PushFilter(d2render.FilterNearest)
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target.PushCompositeMode(d2render.CompositeModeSourceAtop)
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target.PushTranslation(x, y)
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defer target.PopN(3)
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target.Render(v.imageData)
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}
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// SetPosition moves the label to the specified location
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func (v *Label) SetPosition(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) GetTextMetrics(text string) (width, height int) {
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return v.font.GetTextMetrics(text)
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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 = d2render.NewSurface(width, height, d2render.FilterNearest)
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_, surface := d2render.CreateSurface(v.imageData)
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v.font.Render(0, 0, v.text, v.Color, surface)
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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 int) {
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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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