Created
July 6, 2015 10:26
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import QtQuick 2.4 | |
Item { | |
id: thisCircle | |
property string color: "black" | |
property alias border: thisBorder | |
property real renderWidth: width | |
property real renderHeight: height | |
property int horizontalAlignment: Text.AlignHCenter | |
property int verticalAlignment: Text.AlignVCenter | |
ShapeBorder { | |
id: thisBorder | |
} | |
Canvas { | |
id: thisCanvas | |
contextType: "2d" | |
renderStrategy: Canvas.Cooperative | |
renderTarget: Canvas.FramebufferObject | |
anchors.fill: parent | |
onPaint: { | |
var ctx = thisCanvas.context; | |
ctx.reset(); | |
var x = thisCircle.x; | |
var y = thisCircle.y; | |
var w = thisCircle.renderWidth; | |
var h = thisCircle.renderHeight; | |
var centerX = adjustRenderX(); | |
var centerY = adjustRenderY(); | |
var radius = Math.sqrt(Math.pow(w*0.5, 2.0)+Math.pow(h*0.5, 2.0)) * 0.5; | |
ctx.lineWidth = thisCircle.border.width; | |
ctx.strokeStyle = thisCircle.border.color; | |
ctx.fillStyle = thisCircle.color; | |
ctx.moveTo(x, y); | |
ctx.beginPath(); | |
ctx.arc(centerX, centerY, radius, 0.0, Math.PI*2.0, true); | |
ctx.closePath(); | |
ctx.fill(); | |
ctx.stroke(); | |
} | |
} | |
onRenderHeightChanged: { | |
thisCanvas.requestPaint(); | |
} | |
onRenderWidthChanged: { | |
thisCanvas.requestPaint(); | |
} | |
onHorizontalAlignmentChanged: { | |
adjustRenderX(); | |
thisCanvas.requestPaint(); | |
} | |
onVerticalAlignmentChanged: { | |
adjustRenderY(); | |
thisCanvas.requestPaint(); | |
} | |
onScaleChanged: { | |
thisCanvas.requestPaint(); | |
} | |
onXChanged: { | |
thisCanvas.requestPaint(); | |
} | |
onYChanged: { | |
thisCanvas.requestPaint(); | |
} | |
onZChanged: { | |
thisCanvas.requestPaint(); | |
} | |
onWidthChanged: { | |
thisCanvas.requestPaint(); | |
} | |
onHeightChanged: { | |
thisCanvas.requestPaint(); | |
} | |
onClipChanged: { | |
thisCanvas.requestPaint(); | |
} | |
onColorChanged: { | |
thisCanvas.requestPaint(); | |
} | |
Component.onCompleted: { | |
thisCanvas.requestPaint(); | |
} | |
onVisibleChanged: { | |
if (thisCircle.visible) { | |
thisCanvas.requestPaint(); | |
} | |
} | |
function adjustRenderX() { | |
var w = thisCircle.width; | |
var rw = thisCircle.renderWidth; | |
var x = thisCircle.x; | |
var c = x + w; | |
switch(thisCircle.horizontalAlignment) { | |
case Text.AlignLeft: | |
return x + (rw * 0.5); | |
case Text.AlignRight: | |
return (x + w) - (rw * 0.5); | |
default: | |
case Align.Text.AlignHCenter: | |
return c - (rw * 0.5); | |
} | |
} | |
function adjustRenderY() { | |
var h = thisCircle.height; | |
var rh = thisCircle.renderHeight; | |
var y = thisCircle.y; | |
var c = y + h; | |
switch(thisCircle.verticalAlignment) { | |
case Text.AlignTop: | |
return y + (rh * 0.5); | |
case Text.AlignBottom: | |
return (y + h) - (rh * 0.5); | |
default: | |
case Text.AlignVCenter: | |
return c - (rh * 0.5); | |
} | |
} | |
} |
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A 2d circle primitive for use in QtQuick-based applications.