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fix oscilloscope amplitude and direction (#629)

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jberg 2018-08-14 18:46:03 -07:00 • committed by Jordan Eldredge
parent d4a66f4a16
commit 24a618bf0b
1 changed files with 2 additions and 2 deletions
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4
js/components/Visualizer.js
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@ -226,8 +226,8 @@ class Visualizer extends React.Component {
// Iterate over the width of the canvas in "real" pixels.
for (let j = 0; j <= this._renderWidth(); j++) {
const amplitude = sliceAverage(this.dataArray, sliceWidth, j);
const percentAmplitude = (amplitude - 128) / 128; // dataArray gives us bytes
const y = percentAmplitude * h + h / 2; // center wave at half height
const percentAmplitude = amplitude / 255; // dataArray gives us bytes
const y = (1 - percentAmplitude) * h; // flip y
const x = j * PIXEL_DENSITY;
// Canvas coordinates are in the middle of the pixel by default.