86 lines
2 KiB
QML
86 lines
2 KiB
QML
import QtQuick 2.0
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/**
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* Meter in half circle
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*/
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Item {
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/// current level
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property double level: 0.5
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/// minimum level
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property double min: -1
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/// maximum level
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property double max: 1
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/// numbers to write on the scale
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property variant marks: [-1, -0.5, 0, 0.5, 1, -0.2, 0.2, -0.8, 0.8]
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/// theme object
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property QtObject theme
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/// positions helper functions
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function angle(level) {
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return (level - min) / (max - min) * Math.PI - Math.PI / 2
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}
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function getx(angle, k) {
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return width * 0.5 + width * 0.5 * k * Math.sin(angle)
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}
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function gety(angle, k) {
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// k: [0,1]
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return height - height * k * Math.cos(angle)
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}
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/// Ellipse
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Canvas {
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id: ellipse
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anchors.fill: parent
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property double mark_k_min: 0.90
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property double mark_k_max: 0.95
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property double mark_k_text: 0.85
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property int font_size: 16
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onPaint: {
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var ctx = getContext('2d');
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ctx.strokeStyle = theme.primaryColor
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ctx.lineWidth = 1
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ctx.beginPath()
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ctx.moveTo(0,height - 1)
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ctx.bezierCurveTo(0, -height * 0.33, width - 1, -height * 0.33, width - 1, height - 1)
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//ctx.closePath()
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ctx.stroke()
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console.log("ellipse done")
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ctx.font = font_size + "px sans-serif"
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ctx.textAlign = "center"
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for (var i = 0; i < marks.length; i++) {
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var a = angle(marks[i])
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ctx.beginPath()
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ctx.moveTo(getx(a, mark_k_min), gety(a, mark_k_min))
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ctx.lineTo(getx(a, mark_k_max), gety(a, mark_k_max))
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ctx.stroke()
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ctx.fillText(marks[i], getx(a, mark_k_text), gety(a, mark_k_text))
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ctx.strokeText()
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}
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}
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}
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Canvas {
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/// level arrow
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id: arrow
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anchors.fill: parent
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property double k: 0.99
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property double k_base: 0.1
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property double angle: parent.angle(level)
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onPaint: {
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var ctx = getContext('2d');
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ctx.strokeStyle = theme.primaryColor
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ctx.lineWidth = 1
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ctx.beginPath()
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ctx.moveTo(getx(angle, k_base), gety(angle, k_base))
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ctx.lineTo(getx(angle, k), gety(angle, k))
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ctx.stroke()
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console.log("angle: " + angle)
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}
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}
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}
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