kopia lustrzana https://github.com/glidernet/ogn-live
190 wiersze
7.0 KiB
JavaScript
190 wiersze
7.0 KiB
JavaScript
/*
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____ _____ _ _ _ _ _ _ _
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/ __ \ / ____| (_) | | | \ | | | | | |
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| | | |_ __ ___ _ __ | | __| |_ __| | ___ _ __ | \| | ___| |___ _____ _ __| | __
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| | | | '_ \ / _ \ '_ \ | | |_ | | |/ _` |/ _ \ '__| | . ` |/ _ \ __\ \ /\ / / _ \| '__| |/ /
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| |__| | |_) | __/ | | | | |__| | | | (_| | __/ | | |\ | __/ |_ \ V V / (_) | | | <
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\____/| .__/ \___|_| |_| \_____|_|_|\__,_|\___|_| |_| \_|\___|\__| \_/\_/ \___/|_| |_|\_\
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*/
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// barogram option
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var baroCanvas;
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var baroScale;
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var baroMarker;
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var baroCtx;
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var baroScaleCtx;
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var baroMarkCtx;
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var X_max;
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var X_min;
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var Y_max;
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var Y_min;
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var xScale;
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var yScale;
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var xWidth;
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var yHeight;
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var xAxis = []; // optional scale labels
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var yAxis = []; // optional scale labels
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var margin = 10; // all around line graph
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var X_legend = 0;
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var Y_legend = 0;
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var maxAlt = 5000;
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var X_lines = 5+1;
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var Y_lines = 5+1;
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var currentUnit = "";
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var scaleFlag = 0;
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var X_offset = 0;
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var Y_offset = margin+X_legend;
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// show altitude scale on the graph
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function plotScale() {
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// var TxtWidth = baroCtx.measureText(xAxis[0]).width;
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// var TxtHeight = baroCtx.measureText(xAxis[0]).height;
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var TxtHeight = 10;
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baroScaleCtx.strokeStyle="#c0c0c0"; // color of axis text
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baroScaleCtx.beginPath();
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// print parameters on X axis
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if (xAxis.length == X_lines) {
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for (i=0;i<X_lines;i++) {
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var x = i * xWidth / (X_lines-1);
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// baroScaleCtx.fillText(xAxis[i], x+margin-TxtWidth/2, margin+TxtHeight);
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baroScaleCtx.fillText(xAxis[i], x+margin, margin);
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}
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}
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// print parameters on Y axis
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var yStep = yHeight / (Y_lines-1);
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var yScaleStep = (Y_max - Y_min) / (Y_lines-1);
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for (i=0;i<Y_lines;i++) {
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baroScaleCtx.fillText(Math.round(Y_max - (i * yScaleStep)), margin, (i * yStep) + margin+X_legend+TxtHeight/2);
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}
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baroScaleCtx.stroke();
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}
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// show grid lines on the graph
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function plotGrid() {
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baroCtx.strokeStyle="#808080"; // color of grid lines
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baroCtx.beginPath();
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for (i=0;i<=X_lines;i++) {
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var x = i * xWidth / (X_lines-1);
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baroCtx.moveTo(x, margin+X_legend);
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baroCtx.lineTo(x, yHeight+margin+X_legend);
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}
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for (i=0;i<=Y_lines;i++) {
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var y = i * yHeight / (Y_lines-1) + margin+X_legend;
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baroCtx.moveTo(0, y)
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baroCtx.lineTo(xWidth,y)
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}
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baroCtx.stroke();
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// //avoid redrawing the grid every time - set the dynamic image as the background
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// var imageDataURL = baroCanvas.toDataURL();
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// baroCanvas.style.background = imageDataURL; // no work
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// $("#div_baro").css("background-image","url(imageDataURL)"); // no work either
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}
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function baro_Init() {
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X_max = "12:00:00".toSeconds();
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X_min = "11:00:00".toSeconds();
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Y_max = maxAlt;
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Y_min = 0;
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baroCanvas = document.getElementById("div_baro");
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baroCanvas.height = parseInt(document.getElementById("dbaro").offsetHeight, 10);
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baroCtx = baroCanvas.getContext("2d");
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baroCtx.fillStyle = "#808080"; // color of text
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baroCtx.font = "12px Arial";
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baroScale = document.getElementById("div_baroScale");
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baroScale.height = parseInt(document.getElementById("dbaro").offsetHeight, 10);
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baroScaleCtx = baroScale.getContext("2d");
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baroScaleCtx.fillStyle = "#808080"; // color of text
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baroScaleCtx.font = "12px Arial";
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baroMarker = document.getElementById("div_baroMark");
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baroMarker.height = parseInt(document.getElementById("dbaro").offsetHeight, 10);
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baroMarkCtx = baroMarker.getContext("2d");
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baroMarkCtx.fillStyle = "#808080"; // color of text
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baroMarkCtx.font = "12px Arial";
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xWidth = baroCanvas.width;
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yHeight = baroCanvas.height - X_legend - 2*margin;
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yScale = (yHeight) / (Y_max - Y_min);
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xScale = (xWidth) / (X_max - X_min);
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plotScale();
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plotGrid();
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// create a clipping region - simpler than checking X_min
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// baroCtx.beginPath();
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// baroCtx.rect(0, margin+X_legend, 0+xWidth, margin+X_legend+yHeight);
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// baroCtx.clip();
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}
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String.prototype.toSeconds = function () { if (!this) return null; var hms = this.split(':'); return (+hms[0]) * 60 * 60 + (+hms[1]) * 60 + (+hms[2] || 0); }
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// plot a line with color and [x,y] array - rely on clipping region
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function baro_plotData(dCn,dColor,dataSet) {
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if (dataSet.length > 1) {
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// plot the altitude data
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baroCtx.strokeStyle=dColor; // color of line
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baroCtx.beginPath();
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baroCtx.moveTo((dataSet[0][0]-X_min) * xScale + X_offset, yHeight-(dataSet[0][1] * yScale) + Y_offset);
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for (i=1 ;i<dataSet.length;i++) {
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baroCtx.lineTo((dataSet[i][0]-X_min) * xScale + X_offset, yHeight -(dataSet[i][1] * yScale) + Y_offset);
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}
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baroCtx.stroke();
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// plot the markers
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baroMarkCtx.fillStyle = dColor; // color of text
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baroMarkCtx.beginPath();
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baroMarkCtx.fillText(dCn, 0, yHeight -(dataSet[dataSet.length-1][1] * yScale) + Y_offset);
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baroMarkCtx.stroke();
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}
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}
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function baro_plotRefresh() {
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xWidth = baroCanvas.width;
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yHeight = baroCanvas.height - X_legend - 2*margin;
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// update the time scale
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X_min = X_max - (pathl>60 ? 900 : pathl*10); // 5, 10 else 15 minutes
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xScale = (xWidth) / (X_max - X_min);
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// update the altitude scale
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var maxRange = maxAlt * m2ft[unit];
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// auto adjust the range
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// (unit == "i") ? maxRange = Math.ceil((maxRange+250)/2000)*2000 : maxRange = Math.ceil((maxRange+100)/1000)*1000; // 2000 ft or 1000 m increments
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(unit == "i") ? maxRange = Math.ceil((maxRange+500)/1000)*1000 : maxRange = Math.ceil((maxRange+250)/500)*500; // 1000 ft or 500 m increments
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if ((maxRange != Y_max) || (unit != currentUnit)) {
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currentUnit = unit;
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Y_max = maxRange;
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yScale = (yHeight) / (Y_max - Y_min) * m2ft[unit]; // adjust scale with unit here to avoid and extra multiply every y point
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// auto adjust the grid spacing
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// (unit == "i") ? Y_lines = (Y_max / 1000) + 1 : Y_lines = (Y_max / 500) + 1; // 1000 ft or 500 m grid steps
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(unit == "i") ? Y_lines = (Y_max / 1000) + 1 : Y_lines = (Y_max / 250) + 1; // 1000 ft or 250 m grid steps
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baroScaleCtx.clearRect(0, 0, baroScale.width, baroScale.height);
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plotScale();
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}
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// erase the plot (and grid)
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// baroCtx.clearRect(0, margin+X_legend, margin+X_legend+xWidth, margin+X_legend+yHeight);
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baroCtx.clearRect(0, 0, baroCanvas.width, baroCanvas.height);
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plotGrid(); // re-plot the grid
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// erase the markers
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baroMarkCtx.clearRect(0, 0, baroMarker.width, baroMarker.height);
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// reset the flag
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scaleFlag = 0;
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}
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// set the time and altitude scales on the barogram
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function Set_XY_Scale(tim,alt) {
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if (scaleFlag++ == 0) { // use first item as a reference
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X_max = tim.toSeconds();
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maxAlt = +alt; // '+' used for conversion from string to integer
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} else {
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if (X_max < tim.toSeconds()) {
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X_max = tim.toSeconds();
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}
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if (maxAlt < +alt) {
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maxAlt = +alt;
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}
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}
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}
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