claude
23135a96d1
- .sprite format: single-char palette keys (hex/rgb()/CSS names/none), grid rows, '.' transparent by default, max 256x256 per sprite - render/sheet/info/preview subcommands; sheets name themselves <base>_<cellW>x<cellH>_<cols>x<rows>.<ext> (row-major) - SVG output RLE-merges pixel runs; JPG composites over --bg - go tests for parser, colors, scaling, svg, sheet layout Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MmdG9GqfSWCzts7AkDwRDh
47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
package sprite
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import (
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"fmt"
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"io"
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)
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// WriteSVG encodes g as an SVG where each horizontal run of same-colored
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// pixels becomes one <rect>. shape-rendering="crispEdges" keeps the pixel
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// look at any zoom. scale only affects the document width/height; the
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// viewBox stays in pixel units.
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func WriteSVG(w io.Writer, g PixelGrid, scale int) error {
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if scale < 1 {
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scale = 1
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}
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gw, gh := g.Bounds()
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_, err := fmt.Fprintf(w,
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`<svg xmlns="http://www.w3.org/2000/svg" width="%d" height="%d" viewBox="0 0 %d %d" shape-rendering="crispEdges">`+"\n",
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gw*scale, gh*scale, gw, gh)
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if err != nil {
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return err
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}
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for y := 0; y < gh; y++ {
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for x := 0; x < gw; {
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c := g.At(x, y)
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run := 1
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for x+run < gw && g.At(x+run, y) == c {
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run++
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}
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if c.A > 0 {
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opacity := ""
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if c.A < 255 {
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opacity = fmt.Sprintf(` fill-opacity="%.3f"`, float64(c.A)/255)
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}
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_, err = fmt.Fprintf(w, `<rect x="%d" y="%d" width="%d" height="1" fill="#%02x%02x%02x"%s/>`+"\n",
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x, y, run, c.R, c.G, c.B, opacity)
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if err != nil {
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return err
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}
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}
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x += run
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}
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}
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_, err = io.WriteString(w, "</svg>\n")
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return err
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}
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