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import QtQuick 2.0
import "../contents"
Item {
id:container
width:360
height:600
Column {
spacing:5
anchors.fill:parent
Text { font.pointSize:25; text:"Quadratic Curve"; anchors.horizontalCenter:parent.horizontalCenter}
Canvas {
id:canvas
width:360
height:360
property string strokeStyle:"steelblue"
property string fillStyle:"yellow"
property int lineWidth:lineWidthCtrl.value
property bool fill:true
property bool stroke:true
property real alpha:alphaCtrl.value
property real scaleX : scaleXCtrl.value
property real scaleY : scaleYCtrl.value
property real rotate : rotateCtrl.value
smooth:true
renderTarget:Canvas.Image
threadRendering:false
onLineWidthChanged:requestPaint();
onFillChanged:requestPaint();
onStrokeChanged:requestPaint();
onAlphaChanged:requestPaint();
onScaleXChanged:requestPaint();
onScaleYChanged:requestPaint();
onRotateChanged:requestPaint();
Behavior on scaleX { SpringAnimation { spring: 2; damping: 0.2; loops:Animation.Infinite } }
Behavior on scaleY { SpringAnimation { spring: 2; damping: 0.2; loops:Animation.Infinite} }
Behavior on rotate { SpringAnimation { spring: 2; damping: 0.2; loops:Animation.Infinite} }
onPaint: {
var ctx = canvas.getContext('2d');
ctx.reset();
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.globalAlpha = canvas.alpha;
ctx.strokeStyle = canvas.strokeStyle;
ctx.fillStyle = canvas.fillStyle;
ctx.lineWidth = canvas.lineWidth;
ctx.scale(canvas.scaleX, canvas.scaleY);
ctx.rotate(canvas.rotate);
ctx.beginPath();
ctx.moveTo(75,25);
ctx.quadraticCurveTo(25,25,25,62.5);
ctx.quadraticCurveTo(25,100,50,100);
ctx.quadraticCurveTo(50,120,30,125);
ctx.quadraticCurveTo(60,120,65,100);
ctx.quadraticCurveTo(125,100,125,62.5);
ctx.quadraticCurveTo(125,25,75,25);
ctx.closePath();
if (canvas.fill)
ctx.fill();
if (canvas.stroke)
ctx.stroke();
ctx.fillStyle="green";
ctx.font = "Bold 15px";
// ctx.fillText("QML酷毙了", 30, 60); //BUG(in Linux):can't show multiple Chinese characters correctly.
ctx.fillText("QML酷 毙 了 !", 35, 65);
}
}
Rectangle {
id:controls
width:360
height:160
Column {
spacing:3
Slider {id:lineWidthCtrl; width:300; height:30; min:1; max:10; init:2; name:"Line width"}
Slider {id:scaleXCtrl; width:300; height:30; min:0.1; max:10; init:1; name:"ScaleX"}
Slider {id:scaleYCtrl; width:300; height:30; min:0.1; max:10; init:1; name:"ScaleY"}
Slider {id:rotateCtrl; width:300; height:30; min:0; max:Math.PI*2; init:0; name:"Rotate"}
Slider {id:alphaCtrl; width:300; height:30; min:0; max:1; init:1; name:"Alpha"}
}
}
}
}
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