adjustbars.js Example File

demos/mobile/guitartuner/src/mycomponents/adjustbars.js
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/* JavaScript functions for creating, handling and
 * destroying the bars of the adjuster component. */

var maxBars = 10;
var firstBarHeight = 5;
var bars = new Array(maxBars);
var colors = new Array(maxBars);
var barWidthFactor = 2.3;

function createBars() {
    var barWidth = adjuster.width/maxBars/barWidthFactor;
    for (var i = 1; i <= maxBars; i++) {
        //Create, configure and store the bars.
        var bar = Qt.createQmlObject('import QtQuick 1.0; Rectangle {smooth: true}', adjuster, "dynamicBar");
        bar.width = barWidth;
        bar.height = firstBarHeight+(i/maxBars)*(adjuster.height*0.8-firstBarHeight);
        bar.radius = bar.width/2;
        bar.x = (i-1)*(barWidthFactor*barWidth);
        bar.y = adjuster.height/2 - bar.height/2;
        bars[i-1] = bar;

        //Calculate and store the colors
        if (i < maxBars/2) {
            colors[i-1] = Qt.rgba(1-i/(maxBars/2), 1, 1-i/(maxBars/2), i);
        }
        else {
            colors[i-1] = Qt.rgba((i-(maxBars/2))/(maxBars/2), 1-((i-(maxBars/2))/(maxBars/2)), 0, i);
        }
    }
}

function destroyBars() {
    for (var i = 0; i < maxBars; i++) {
        bars[i].color = "transparent" //Colors must be set to transparent or otherwise the bars will stay appeared.
        bars[i].destroy();
    }
}

function fillBars(barNumber) {
    //Set the color for the bars (transparent from the selected bar to the end).
    for (var i = 0; i < maxBars; i++) {
        if (i < barNumber) {
            bars[i].color = colors[i];
        }
        else {
            bars[i].color = "black";
        }
    }
}

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