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made the freq plot a bit nicer

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This commit is contained in:
Ahmet Inan 2024-04-28 09:37:08 +02:00
parent 1859f4b9e8
commit e81d29f89a
1 changed files with 9 additions and 3 deletions
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12
app/src/main/java/xdsopl/robot36/MainActivity.java
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@ -120,12 +120,18 @@ public class MainActivity extends AppCompatActivity {
int stride = freqPlotBuffer.width;
int line = stride * freqPlotBuffer.line;
int channels = recordChannel > 0 ? 2 : 1;
int samples = recordBuffer.length / channels;
int spread = 2;
Arrays.fill(freqPlotBuffer.pixels, line, line + stride, 0);
for (int i = 0; i < recordBuffer.length / channels; ++i) {
for (int i = 0; i < samples; ++i) {
int x = Math.round((recordBuffer[i] + 2.5f) * 0.25f * stride);
if (x >= 0 && x < stride)
freqPlotBuffer.pixels[line + x] = tint;
if (x >= spread && x < stride - spread)
for (int j = - spread; j <= spread; ++j)
freqPlotBuffer.pixels[line + x + j] += 1 + spread * spread - j * j;
}
int factor = 960 / samples;
for (int i = 0; i < stride; ++i)
freqPlotBuffer.pixels[line + i] = 0xff000000 | 0x00010101 * Math.min(factor * freqPlotBuffer.pixels[line + i], 255);
System.arraycopy(freqPlotBuffer.pixels, line, freqPlotBuffer.pixels, line + stride * (freqPlotBuffer.height / 2), stride);
freqPlotBuffer.line = (freqPlotBuffer.line + 1) % (freqPlotBuffer.height / 2);
int offset = stride * (freqPlotBuffer.line + freqPlotBuffer.height / 2 - height);