Will Anderson
47 lines
2.3 KiB
EmacsLisp
47 lines
2.3 KiB
EmacsLisp
// canvas.el — Full server-side pipeline: layout -> render -> SVG string.
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//
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// This is the primary integration point for callers that want a static SVG
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// without managing the layout and render steps separately.
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//
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// Public API:
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// graph_svg_endpoint(nodes_json, edges_json, width, height) -> String
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// Full pipeline: Coulomb/spring layout (150 iterations) -> SVG string.
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// Returns a complete <svg>...</svg> string.
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//
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// Client-side interaction (drag, zoom, pan) is deferred until el-ui-compiler
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// gains a JavaScript backend. For now, all rendering is server-side.
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// Clients refresh the SVG on demand (e.g., polling GET /api/graph/svg).
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//
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// Zoom/pan note: SVG viewBox is fixed to [0,0,width,height]. When the JS
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// backend lands, el-ui-compiler will produce an overlay with pointer-event
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// handlers that transform a <g> wrapper inside this SVG. The server-side path
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// stays as a fallback for non-browser consumers (CLI, PDF export, testing).
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fn layout_default_iterations() -> Int { 150 }
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// ── graph_svg_endpoint ────────────────────────────────────────────────────────
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fn graph_svg_endpoint(nodes_json: String, edges_json: String, width: Int, height: Int) -> String {
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let w_f: Float = int_to_float(width)
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let h_f: Float = int_to_float(height)
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// Step 1: compute layout
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let positions_json: String = layout_run(nodes_json, edges_json, w_f, h_f, layout_default_iterations())
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// Step 2: render to SVG
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let svg: String = graph_render_svg(nodes_json, edges_json, positions_json, width, height)
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svg
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}
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// ── graph_svg_endpoint_custom ─────────────────────────────────────────────────
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//
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// Same as above but with configurable iteration count.
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// Use when you need faster layout (low iters) or higher quality (high iters).
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fn graph_svg_endpoint_custom(nodes_json: String, edges_json: String, width: Int, height: Int, iterations: Int) -> String {
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let w_f: Float = int_to_float(width)
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let h_f: Float = int_to_float(height)
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let positions_json: String = layout_run(nodes_json, edges_json, w_f, h_f, iterations)
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graph_render_svg(nodes_json, edges_json, positions_json, width, height)
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}
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