Greg Pomerantz
93a7a0a0b2
- Remove Renderer.scale field and SetScale method - Add ScaleProvider interface to avoid editor/ui import cycle - Add Scale() method to State, rename Scale field to scale - Renderer reads scale through r.scale.Scale() - Fix icons.go blank import preventing embed.FS usage - Update main.go to pass State as ScaleProvider to Renderer
94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
package ui
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import (
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"image/color"
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"gioui.org/f32"
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"gioui.org/layout"
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"gioui.org/op"
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"gioui.org/op/clip"
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"gioui.org/op/paint"
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"gioui.org/text"
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"gioui.org/unit"
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"golang.org/x/image/math/fixed"
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)
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// ShapedText holds the result from ShapeText: width for positioning,
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// plus the path data ready to draw. Must be drawn before the next ShapeText call.
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type ShapedText struct {
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Width int // total width in pixels
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PathSpec clip.PathSpec // glyph path data
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Bitmaps op.CallOp // bitmap glyphs (may be empty)
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FirstX fixed.Int26_6 // first glyph X offset
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FirstY int32 // first glyph Y offset
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}
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// ShapeText layouts text and returns width + path data for drawing.
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// The returned ShapedText must be drawn before the next ShapeText call.
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func (r *Renderer) ShapeText(gtx layout.Context, str string, size unit.Sp) ShapedText {
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r.shp.LayoutString(text.Parameters{
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PxPerEm: fixed.I(gtx.Sp(size)),
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MinWidth: 0,
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MaxWidth: 1000,
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MaxLines: 1,
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}, str)
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// Collect glyphs and measure width
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var glyphs []text.Glyph
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var cumWidth fixed.Int26_6
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var firstX fixed.Int26_6
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var firstY int32
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for {
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g, ok := r.shp.NextGlyph()
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if !ok {
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break
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}
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if len(glyphs) == 0 {
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firstX = g.X
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firstY = g.Y
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}
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cumWidth += g.Advance
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glyphs = append(glyphs, g)
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}
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// capture path spec
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var spec clip.PathSpec
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var bitmaps op.CallOp
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spec = r.shp.Shape(glyphs)
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bitmaps = r.shp.Bitmaps(glyphs)
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return ShapedText{
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Width: int(cumWidth >> 6),
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PathSpec: spec,
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Bitmaps: bitmaps,
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FirstX: firstX,
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FirstY: firstY,
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}
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}
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// DrawShapedText draws a ShapedText at the given position.
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func (r *Renderer) DrawShapedText(gtx layout.Context, st ShapedText, x, y Dp, col color.NRGBA) {
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xPx := r.toPx(x)
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yPx := r.toPx(y)
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m := op.Record(gtx.Ops)
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offX := float32(xPx) + float32(st.FirstX)/64.0
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offY := float32(yPx) + float32(st.FirstY)
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t := op.Affine(f32.Affine2D{}.Offset(f32.Pt(offX, offY))).Push(gtx.Ops)
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outline := clip.Outline{Path: st.PathSpec}.Op().Push(gtx.Ops)
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paint.ColorOp{Color: col}.Add(gtx.Ops)
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paint.PaintOp{}.Add(gtx.Ops)
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outline.Pop()
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if st.Bitmaps != (op.CallOp{}) {
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st.Bitmaps.Add(gtx.Ops)
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}
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t.Pop()
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call := m.Stop()
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call.Add(gtx.Ops)
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}
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