About Ctx arc
Are you looking for an easy way to implement a fully customizable, nicely animated progress circle in QML?This is the way to go:Use a canvas control to paint the arc and a full circle as a background. You can set the size of the control, colort and the start and end angle of the arc. If you change the angles, the change will be animated – of course, you can turn the animation off. If isPie set to true, a pie segment is painted instead of an animation.ProgressCircle.cml:// ByteBau (Jörn Buchholz) @bytebau.comimport QtQuick 2.0import QtQml 2.2Item { id: root width: size height: size property int size: 200 // The size of the circle in pixel property real arcBegin: 0 // start arc angle in degree property real arcEnd: 270 // end arc angle in degree property real arcOffset: 0 // rotation property bool isPie: false // paint a pie instead of an arc property bool showBackground: false // a full circle as a background of the arc property real lineWidth: 20 // width of the line property string colorCircle: "#CC3333" property string colorBackground: "#779933" property alias beginAnimation: animationArcBegin.enabled property alias endAnimation: animationArcEnd.enabled property int animationDuration: 200 onArcBeginChanged: canvas.requestPaint() onArcEndChanged: canvas.requestPaint() Behavior on arcBegin { id: animationArcBegin enabled: true NumberAnimation { duration: root.animationDuration easing.type: Easing.InOutCubic } } Behavior on arcEnd { id: animationArcEnd enabled: true NumberAnimation { duration: root.animationDuration easing.type: Easing.InOutCubic } } Canvas { id: canvas anchors.fill: parent rotation: -90 + parent.arcOffset onPaint: { var ctx = getContext("2d") var x = width / 2 var y = height / 2 var start = Math.PI * (parent.arcBegin / 180) var end = Math.PI * (parent.arcEnd / 180) ctx.reset() if (root.isPie) { if (root.showBackground) { ctx.beginPath() ctx.fillStyle = root.colorBackground ctx.moveTo(x, y) ctx.arc(x, y, width / 2, 0, Math.PI * 2, false) ctx.lineTo(x, y) ctx.fill() } ctx.beginPath() ctx.fillStyle = root.colorCircle ctx.moveTo(x, y) ctx.arc(x, y, width / 2, start, end, false) ctx.lineTo(x, y) ctx.fill() } else { if (root.showBackground) { ctx.beginPath(); ctx.arc(x, y, (width / 2) - parent.lineWidth / 2, 0, Math.PI * 2, false) ctx.lineWidth = root.lineWidth ctx.strokeStyle = root.colorBackground ctx.stroke() } ctx.beginPath(); ctx.arc(x, y, (width / 2) - parent.lineWidth / 2, start, end, false) ctx.lineWidth = root.lineWidth ctx.strokeStyle = root.colorCircle ctx.stroke() } } }}To use the component like in the picture above, just place it inside a layout container like this:Row { anchors.centerIn: parent spacing: 10 ProgressCircle { size: 160 colorCircle: "#0092CC" colorBackground: "#E6E6E6" arcBegin: 0 arcEnd: 270 lineWidth: 10 } ProgressCircle { size: 160 colorCircle: "#FF3333" colorBackground: "#E6E6E6" showBackground: true arcBegin: 0 arcEnd: 220 } ProgressCircle { size: 160 colorCircle: "#779933" colorBackground: "#E6E6E6" showBackground: true isPie: true arcBegin: 90 arcEnd: 200 }}
Key features of the Ctx arc that are enabled through these drivers include:
- Studio Controls for COM - ctx ListView
- Pfister Comet S2 CTX C3
- Pfister Comet S2 CTX C4
- CTX - Account Creation - Treasury Software
- Pfister Comet S2 CTX Pack
- Bravado Gauntlet Hellfire CTX [Add-On
- Why Upgrade To CTX Feed Pro
Canvas 5 PolyfillCanvas 5 Polyfill is a Javascript polyfill library to fill in new features for HTML 5Canvas that browsers may not have implemented yet, such as Path2D objects andellipse() on CanvasRenderingContext2D.InstallationCanvas 5 Polyfill uses Bower to make installation easy: bower install --save canvas-5-polyfillYou can also get the code directly at GitHub.Usage Test Canvas Polyfill var ctx = document.getElementById('ID').getContext('2d'); var p = new Path2D(); p.moveTo(100, 10); p.lineTo(10, 100); ctx.strokeStyle = '#555'; ctx.lineWidth = 10; ctx.stroke(p); "> Test Canvas Polyfill var ctx = document.getElementById('ID').getContext('2d'); var p = new Path2D(); p.moveTo(100, 10); p.lineTo(10, 100); ctx.strokeStyle = '#555'; ctx.lineWidth = 10; ctx.stroke(p); StatusCanvas 5 Polyfill adds the following classes and methods to an existing HTMLCanvas implementation if they are missing, if they are not missing the nativeimplementations are used:The polyfill adds the following methods to CanvasRenderingContext2D:void stroke(Path2D path);void fill(Path2D path, optional CanvasFillRule fillRule = "nonzero");void clip(Path2D path, optional CanvasFillRule fillRule = "nonzero");boolean isPointInPath(Path2D path, double x, double y, optional CanvasFillRule fillRule = "nonzero");boolean isPointInStroke(Path2D path, double x, double y);void ellipse( double x, double y, double radiusX, double radiusY, double rotation, double startAngle, double endAngle, optional boolean anticlockwise = false);It also adds Path2D with the following constructors:Path2D()Path2D(Path2D path, optional CanvasFillRule fillRule = "nonzero"),Path2D(DOMString d)Where Path2D has the following methods:void addPath(Path2D path, SVGMatrix? transformation);void closePath();void moveTo(double x, double y);void lineTo(double x, double y);void quadraticCurveTo( double cpx, double cpy, double x, double y);void bezierCurveTo( double cp1x, double cp1y, double cp2x, double cp2y, double x, double y);void arcTo(double x1, double y1, double x2, double y2, double radius);void arcTo(double x1, double y1, double x2, double y2, double radiusX, double radiusY, double rotation);void rect(double x, double y, double w, double h);void arc(double x, double y, double radius, double startAngle, double endAngle, optional boolean anticlockwise = false);void ellipse(double x, double y, double radiusX, double radiusY, double rotation, double startAngle, double
