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import QtQuick 2.0
import "HeartData.js" as Data
Rectangle {
id: app
anchors.fill: parent
color: "black"
property int frequency: 60
property int beatDataIndex: -1
property int heartDataIndex: 0
property int beatDifference: 1200
property var previousTime: 0
property string curveColor: "#22ff22"
property string alarmColor: "#ff2222"
property string textColor: "#22ff22"
property string gridColor: "#333333"
function pulse() {
if (!heartAnimation.running) {
heartAnimation.restart()
heartTimer.restart()
calculateFrequency();
app.beatDataIndex = 0
}
}
function calculateFrequency() {
var ms = new Date().getTime();
if (app.previousTime > 0)
app.beatDifference = 0.8*beatDifference + 0.2*(ms - app.previousTime)
app.frequency = Math.round(60000.0 / app.beatDifference)
app.previousTime = ms;
}
function updateData() {
app.heartDataIndex++;
if (app.heartDataIndex >= Data.heartData.length)
app.heartDataIndex = 0;
else
app.heartDataIndex++;
if (beatDataIndex >= 0)
fillBeatData()
else
fillRandomData()
heartCanvas.requestPaint()
}
function fillBeatData() {
var value = 0;
switch (app.beatDataIndex) {
case 0: value = Math.random()*0.1+0.1; break;
case 1: value = Math.random()*0.1+0.0; break;
case 2: value = Math.random()*0.3+0.7; break;
case 3: value = Math.random()*0.1-0.05; break;
case 4: value = Math.random()*0.3-0.8; break;
case 5: value = Math.random()*0.1-0.05; break;
case 6: value = Math.random()*0.1-0.05; break;
case 7: value = Math.random()*0.1+0.15; break;
default: value = 0; break;
}
Data.heartData[app.heartDataIndex] = value;
app.beatDataIndex++;
if (app.beatDataIndex > 7)
app.beatDataIndex = -1
}
function fillRandomData() {
Data.heartData[app.heartDataIndex] = Math.random()*0.05-0.025
}
onWidthChanged: {
Data.fillHeartData(Math.floor(app.width*0.5))
gridCanvas.requestPaint();
}
onHeightChanged: gridCanvas.requestPaint()
Rectangle {
id: grid
anchors.fill: parent
color: "transparent"
Canvas {
id: gridCanvas
anchors.fill: parent
antialiasing: true
renderTarget: Canvas.Image
onPaint: {
var ctx = gridCanvas.getContext('2d')
ctx.clearRect(0,0,grid.width,grid.height)
var step = 1000 / updateTimer.interval * (app.width / Data.heartData.length)
var xCount = app.width / step
var yCount = app.height / step
ctx.strokeStyle = app.gridColor;
var x=0;
ctx.beginPath()
for (var i=0; i<xCount; i++) {
x = i*step
ctx.moveTo(x,0)
ctx.lineTo(x,app.height)
}
ctx.stroke()
ctx.closePath()
var y=0;
ctx.beginPath()
for (var j=0; j<yCount; j++) {
y = j*step
ctx.moveTo(0, y)
ctx.lineTo(app.width,y)
}
ctx.stroke()
ctx.closePath()
}
}
}
Rectangle {
id: canvasBackground
anchors { bottom: parent.bottom; left: parent.left; right: parent.right }
height: 0.75 * parent.height
gradient: Gradient {
GradientStop {position: .0; color :"black"}
GradientStop {position: .5; color :"#00ff00"}
GradientStop {position: 1.0; color :"black"}
}
opacity: .3
}
Rectangle {
id: canvasContainer
anchors.fill: canvasBackground
color: "transparent"
Canvas {
id: heartCanvas
anchors.fill: parent
antialiasing: true
renderTarget: Canvas.Image
onPaint: {
var ctx = heartCanvas.getContext('2d')
ctx.clearRect(0,0,canvasContainer.width,canvasContainer.height)
var baseY = heartCanvas.height/2;
var length = Data.heartData.length;
var step = (heartCanvas.width-5) / length;
var yFactor = heartCanvas.height * 0.35;
var heartIndex = (heartDataIndex+1) % length;
ctx.strokeStyle = app.curveColor;
ctx.beginPath()
ctx.moveTo(0,baseY)
var i=0, x=0, y=0;
for (i=0; i<length; i++) {
x=i*step;
y=baseY - Data.heartData[heartIndex]*yFactor;
ctx.lineTo(x,y)
heartIndex = (heartIndex+1)%length;
}
ctx.stroke()
ctx.closePath()
ctx.beginPath()
ctx.fillStyle = app.curveColor
ctx.ellipse(x-5,y-5,10,10)
ctx.fill()
ctx.closePath()
}
}
}
Image {
id: heart
anchors { left: parent.left; top: parent.top }
anchors.margins: app.width * 0.05
height: parent.height * 0.2
width: height*1.2
source: "heart.png"
MouseArea {
anchors.fill: parent
onPressed: pulse()
}
}
Text {
id: pulseText
anchors { right: parent.right; verticalCenter: heart.verticalCenter }
anchors.margins: app.width * 0.05
antialiasing: true
text: app.frequency
color: app.frequency > 100 ? app.alarmColor : app.textColor
font { pixelSize: app.width * .1; bold: true }
}
// Pulse timer
Timer {
id: heartTimer
interval: 1200
running: true
repeat: false
onTriggered: pulse()
}
// Update timer
Timer {
id: updateTimer
interval: 30
running: true
repeat: true
onTriggered: updateData()
}
SequentialAnimation{
id: heartAnimation
NumberAnimation { target: heart; property: "scale"; duration: 100; from: 1.0; to:1.2; easing.type: Easing.Linear }
NumberAnimation { target: heart; property: "scale"; duration: 100; from: 1.2; to:1.0; easing.type: Easing.Linear }
}
Component.onCompleted: {
Data.fillHeartData(Math.max(100,Math.floor(app.width*0.5)))
}
}
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