daniel
f39fb1b145
New pure curve_tessellate joins the overlay's node vertices through curveMap, one sample per pixel column; the knot no longer floats off its own trace.
35 lines
1.8 KiB
C++
35 lines
1.8 KiB
C++
// curve_tessellate.h — the staged envelope's TRACE: envelope_overlay's node vertices joined by
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// the curve each stage's exponent defines. Split from that module on the axis the two already
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// have — envelope_overlay decides where a node LANDS, this strokes the span BETWEEN two of
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// them over phi, so a re-scaled time axis changes nothing here.
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#pragma once
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#include <vector>
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#include "core/instrument/ui/envelope_overlay.h"
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#include "core/ui/stroke_aa.h" // StrokePoint — the stroker's own vertex type
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namespace reasampler::instrument::ui {
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// The exponent governing the segment that ENDS at `node`: attack, decay and release are the
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// three sloped stages. Every other node ends a plateau, whose straightness comes from its own
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// zero level span rather than from an exponent, so neutral is returned and no caller needs a
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// second rule to recognize one.
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double segmentCurve(const StageEnvelope& env, EnvNode endNode);
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// Replaces `out` with the polyline the shell strokes. Knot vertices are handles, not line
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// vertices, and are skipped; node vertices keep their exact INTEGER coordinates (clamped to
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// [xLo, xHi]) because those are the positions their draggable handles are drawn at. Only the
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// interior samples are sub-pixel, one per pixel column, which is what makes the density follow
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// the canvas width instead of a fixed count.
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//
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// A segment's level runs start + (end - start) * curveMap(phi, exponent) — the composition
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// envelopes.h's four evaluators use, so the trace cannot diverge from the sound. A neutral
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// exponent or a zero level span emits the two endpoints and nothing between: the straight
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// stroke, vertex for vertex.
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void buildEnvelopeTrace(const std::vector<EnvVertex>& poly, const StageEnvelope& env, int xLo,
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int xHi, std::vector<reasampler::ui::StrokePoint>& out);
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} // namespace reasampler::instrument::ui
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