38 lines
873 B
Go
38 lines
873 B
Go
package viz
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import (
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"bspviz/internal/bsp"
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"bytes"
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"fmt"
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"os"
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)
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func EmitDOT(root *bsp.Node, path string) error {
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var buf bytes.Buffer
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buf.WriteString("digraph BSP {\n")
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buf.WriteString(" node [fontname=\"Helvetica\"];\n")
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id := 0
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var walk func(*bsp.Node) int
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walk = func(n *bsp.Node) int {
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my := id
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id++
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if n.Leaf != nil {
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fmt.Fprintf(&buf, " n%d [label=\"Leaf\\nSegs=%d\", shape=ellipse, style=filled, fillcolor=lightgray];\n",
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my, len(n.Leaf.Segs))
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return my
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}
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fmt.Fprintf(&buf, " n%d [label=\"Split\\nO=(%.0f,%.0f) D=(%.0f,%.0f)\"];\n",
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my, n.O.X, n.O.Y, n.D.X, n.D.Y)
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l := walk(n.Left)
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r := walk(n.Right)
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fmt.Fprintf(&buf, " n%d -> n%d [label=\"L\"];\n", my, l)
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fmt.Fprintf(&buf, " n%d -> n%d [label=\"R\"];\n", my, r)
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return my
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}
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walk(root)
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buf.WriteString("}\n")
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return os.WriteFile(path, buf.Bytes(), 0644)
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}
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