examples/quick/canvas/roundedrect/roundedrect.qml

   1 /****************************************************************************
   2 **
   3 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
   4 ** Contact: http://www.qt-project.org/
   5 **
   6 ** This file is part of the examples of the Qt Toolkit.
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  39 ****************************************************************************/
  40
  41 import QtQuick 2.0
  42 import "../contents"
  43 Item {
  44   id:container
  45   width:320
  46   height:480
  47
  48   Column {
  49     spacing:5
  50     anchors.fill:parent
  51     Text { font.pointSize:15; text:"Rounded rectangle"; anchors.horizontalCenter:parent.horizontalCenter}
  52     Canvas {
  53         id:canvas
  54         width:320
  55         height:280
  56         smooth:true
  57
  58         property int radius: rCtrl.value
  59         property int rectx: rxCtrl.value
  60         property int recty: ryCtrl.value
  61         property int rectWidth: width - 2*rectx
  62         property int rectHeight: height - 2*recty
  63         property string strokeStyle:"blue"
  64         property string fillStyle:"steelblue"
  65         property int lineWidth:lineWidthCtrl.value
  66         property bool fill:true
  67         property bool stroke:true
  68         property real alpha:alphaCtrl.value
  69
  70         onLineWidthChanged:requestPaint();
  71         onFillChanged:requestPaint();
  72         onStrokeChanged:requestPaint();
  73         onRadiusChanged:requestPaint();
  74         onRectxChanged:requestPaint();
  75         onRectyChanged:requestPaint();
  76         onAlphaChanged:requestPaint();
  77
  78         onPaint: {
  79             var ctx = getContext("2d");
  80             ctx.save();
  81             ctx.clearRect(0,0,canvas.width, canvas.height);
  82             ctx.strokeStyle = canvas.strokeStyle;
  83             ctx.lineWidth = canvas.lineWidth
  84             ctx.fillStyle = canvas.fillStyle
  85             ctx.globalAlpha = canvas.alpha
  86             ctx.beginPath();
  87             ctx.moveTo(rectx+radius,recty);                 // top side
  88             ctx.lineTo(rectx+rectWidth-radius,recty);
  89             // draw top right corner
  90             ctx.arcTo(rectx+rectWidth,recty,rectx+rectWidth,recty+radius,radius);
  91             ctx.lineTo(rectx+rectWidth,recty+rectHeight-radius);    // right side
  92             // draw bottom right corner
  93             ctx.arcTo(rectx+rectWidth,recty+rectHeight,rectx+rectWidth-radius,recty+rectHeight,radius);
  94             ctx.lineTo(rectx+radius,recty+rectHeight);              // bottom side
  95             // draw bottom left corner
  96             ctx.arcTo(rectx,recty+rectHeight,rectx,recty+rectHeight-radius,radius);
  97             ctx.lineTo(rectx,recty+radius);                 // left side
  98             // draw top left corner
  99             ctx.arcTo(rectx,recty,rectx+radius,recty,radius);
 100             ctx.closePath();
 101             if (canvas.fill)
 102                 ctx.fill();
 103             if (canvas.stroke)
 104                 ctx.stroke();
 105             ctx.restore();
 106         }
 107     }
 108
 109     Rectangle {
 110         id:controls
 111         width:320
 112         height:150
 113         Column {
 114           spacing:3
 115           Slider {id:lineWidthCtrl; width:300; height:20; min:1; max:10; init:2; name:"Line width"}
 116           Slider {id:rxCtrl; width:300; height:20; min:5; max:30; init:10; name:"rectx"}
 117           Slider {id:ryCtrl; width:300; height:20; min:5; max:30; init:10; name:"recty"}
 118           Slider {id:rCtrl; width:300; height:20; min:10; max:100; init:40; name:"Radius"}
 119           Slider {id:alphaCtrl; width:300; height:20; min:0; max:1; init:1; name:"Alpha"}
 120         }
 121     }
 122   }
 123 }