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feat(plot): lock axes and calculate marker levels in dB

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Andrey
2026-09-04 13:50:20 +03:00
parent f6787163dc
commit d9eb7dd9ad
8 changed files with 42 additions and 6 deletions
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3
c/set-protocol/include/set_plot.h
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@@ -16,7 +16,8 @@ enum set_plot_operation {
SET_PLOT_VALUE = 3, /* fraction,low,high,inverted -> value (not clamped) */
SET_PLOT_DRAG = 4, /* initial,deltaPixels,length,low,high,inverted -> clamped value */
SET_PLOT_TICK_STEP = 5, /* range,lengthPixels -> nice step */
SET_PLOT_DELTA = 6 /* A,B,multiplier -> (B-A)*multiplier */
SET_PLOT_DELTA = 6, /* A,B,multiplier -> (B-A)*multiplier */
SET_PLOT_DB_DELTA = 7 /* A,B -> 20*log10(abs(B/A)); zero is invalid */
};
/** Version of this plot ABI, independently of the transport ABI. */

2
c/set-protocol/ports/android/kotlin/ru/setcorp/setprotocol/trends/NativePlot.kt
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@@ -30,3 +30,5 @@ data class PlotBounds(val left: Double, val right: Double, val bottom: Double, v
fun plotTickStep(range: Double, pixels: Double): Double = NativePlot.call(5, range, pixels)[0]
fun plotDelta(a: Double, b: Double, multiplier: Double = 1.0): Double = NativePlot.call(6, a, b, multiplier)[0]
fun plotDbDelta(a: Double, b: Double): Double? =
runCatching { NativePlot.call(7, a, b)[0] }.getOrNull()

6
c/set-protocol/ports/android/kotlin/ru/setcorp/setprotocol/trends/PlotViewport.kt
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@@ -1,10 +1,12 @@
package ru.setcorp.setprotocol.trends
/** Normalized top-left viewport; independent of pixels, units, toolkit and samples. */
data class PlotViewport(val x: Double = 0.0, val y: Double = 0.0, val width: Double = 1.0, val height: Double = 1.0) {
data class PlotViewport(val x: Double = 0.0, val y: Double = 0.0, val width: Double = 1.0, val height: Double = 1.0,
val locked: Boolean = false) {
fun transform(zoomX: Double = 1.0, zoomY: Double = 1.0, panX: Double = 0.0, panY: Double = 0.0,
focusX: Double = 0.5, focusY: Double = 0.5): PlotViewport {
if (locked) return this
val result = NativePlot.call(0, x, y, width, height, zoomX, zoomY, panX, panY, focusX, focusY)
return PlotViewport(result[0], result[1], result[2], result[3])
return PlotViewport(result[0], result[1], result[2], result[3], locked)
}
}

8
c/set-protocol/ports/android/tests/ru/setcorp/setprotocol/trends/PlotContractTest.kt
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@@ -37,4 +37,12 @@ class PlotContractTest {
val crossed = markers.move(TrendMarker.A, 1900.0).move(TrendMarker.B, 1100.0)
assertEquals(-800.0, plotDelta(crossed.a!!, crossed.b!!), 0.0)
}
@Test fun lockedViewportIgnoresZoomAndPanAndDbUsesAmplitudeRatio() {
val locked = PlotViewport(locked = true)
assertEquals(locked, locked.transform(zoomX = 2.0, panY = 0.2))
assertEquals(20.0, plotDbDelta(1.0, 10.0)!!, 1e-10)
assertEquals(-20.0, plotDbDelta(10.0, 1.0)!!, 1e-10)
assertNull(plotDbDelta(0.0, 1.0))
}
}

8
c/set-protocol/src/set_plot.c
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@@ -11,9 +11,9 @@ static int finite_values(const double *v, size_t n) {
uint32_t set_plot_abi_version(void) { return 1U; }
size_t set_plot_eval(uint32_t op, const double *v, size_t n, double *out, size_t cap) {
static const size_t sizes[] = {10, 3, 4, 4, 6, 2, 3};
static const size_t sizes[] = {10, 3, 4, 4, 6, 2, 3, 2};
double span, fraction;
if (op > SET_PLOT_DELTA || !v || !out || n != sizes[op] ||
if (op > SET_PLOT_DB_DELTA || !v || !out || n != sizes[op] ||
cap < (op == SET_PLOT_TRANSFORM ? 4U : 1U)) return 0;
if (op == SET_PLOT_TRANSFORM) {
double w, h, fx, fy;
@@ -65,6 +65,10 @@ size_t set_plot_eval(uint32_t op, const double *v, size_t n, double *out, size_t
break;
}
case SET_PLOT_DELTA: out[0] = (v[1] - v[0]) * v[2]; break;
case SET_PLOT_DB_DELTA:
if (v[0] == 0 || v[1] == 0) return 0;
out[0] = 20 * log10(fabs(v[1] / v[0]));
break;
default: return 0;
}
return isfinite(out[0]) ? 1 : 0;

3
c/set-protocol/tests/fixtures/plot-v1.json vendored
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@@ -20,6 +20,9 @@
{"name":"ticks","op":5,"input":[100,800],"output":[20]},
{"name":"negative_delta","op":6,"input":[10,0,1],"output":[-10]},
{"name":"milliseconds","op":6,"input":[0,0.01,1000],"output":[10]},
{"name":"db_gain","op":7,"input":[1,10],"output":[20]},
{"name":"db_attenuation","op":7,"input":[10,1],"output":[-20]},
{"name":"db_zero_reference","op":7,"input":[0,1],"output":null},
{"name":"zero_range","op":2,"input":[1,1,1,0],"output":null},
{"name":"zero_pixels","op":4,"input":[0,1,0,0,1,0],"output":null},
{"name":"bad_viewport","op":0,"input":[0,0,0,1,2,1,0,0,0.5,0.5],"output":null}