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added bandwidth lines to waterfall

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DJ2LS 2022-11-17 23:42:24 +01:00
parent ce32d589ab
commit 5a1eb7a8b8
1 changed files with 46 additions and 0 deletions
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46
gui/src/waterfall/spectrum.js
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@ -72,6 +72,52 @@ Spectrum.prototype.drawSpectrum = function(bins) {
var width = this.ctx.canvas.width;
var height = this.ctx.canvas.height;
// Modification by DJ2LS
// Draw bandwidth lines
// TODO: Math not correct. But a first attempt
// it seems position is more or less equal to frequenzy by factor 10
// eg. position 150 == 1500Hz
/*
// CENTER LINE
this.ctx_wf.beginPath();
this.ctx_wf.moveTo(150,0);
this.ctx_wf.lineTo(150, height);
this.ctx_wf.lineWidth = 1;
this.ctx_wf.strokeStyle = '#8C8C8C';
this.ctx_wf.stroke()
*/
// 586Hz LINES
var bandwidth = 568;
var linePositionLow = 150 - ((bandwidth/2)/10);
var linePositionHigh = 150 + ((bandwidth/2)/10);
this.ctx_wf.beginPath();
this.ctx_wf.moveTo(linePositionLow,0);
this.ctx_wf.lineTo(linePositionLow, height);
this.ctx_wf.moveTo(linePositionHigh,0);
this.ctx_wf.lineTo(linePositionHigh, height);
this.ctx_wf.lineWidth = 1;
this.ctx_wf.strokeStyle = '#C3C3C3';
this.ctx_wf.stroke()
// 1700Hz LINES
var bandwidth = 1700;
var linePositionLow = 150 - ((bandwidth/2)/10);
var linePositionHigh = 150 + ((bandwidth/2)/10);
this.ctx_wf.beginPath();
this.ctx_wf.moveTo(linePositionLow,0);
this.ctx_wf.lineTo(linePositionLow, height);
this.ctx_wf.moveTo(linePositionHigh,0);
this.ctx_wf.lineTo(linePositionHigh, height);
this.ctx_wf.lineWidth = 1;
this.ctx_wf.strokeStyle = '#C3C3C3';
this.ctx_wf.stroke()
// ---- END OF MODIFICATION ------
// Fill with black
this.ctx.fillStyle = "white";
this.ctx.fillRect(0, 0, width, height);