qt qml 九宫格划指锁屏视图

九宫格划指锁屏视图
Lisence: MIT, 请保留本文档说明
Author: surfsky.cnblogs.com 2015-02
【先看效果】
【下载】
http://download.csdn.net/detail/surfsky/8444999
【核心代码】
 1     //----------------------------------
 2     // 放置9个圆点
 3     //----------------------------------
 4     Grid{
 5         id: grid
 6          400
 7         height: 400
 8         anchors.bottom: parent.bottom
 9         anchors.horizontalCenter: parent.horizontalCenter
10         anchors.bottomMargin: 50
11         columns: 3
12         rows: 3
13         spacing: (width-ptWidth*3)/2
14 
15         LockPoint{ptWidth; lockId: 1;}
16         LockPoint{ptWidth; lockId: 2;}
17         LockPoint{ptWidth; lockId: 3;}
18         LockPoint{ptWidth; lockId: 4;}
19         LockPoint{ptWidth; lockId: 5;}
20         LockPoint{ptWidth; lockId: 6;}
21         LockPoint{ptWidth; lockId: 7;}
22         LockPoint{ptWidth; lockId: 8;}
23         LockPoint{ptWidth; lockId: 9;}
24     }
25 
26 
27     //----------------------------------
28     // 绘制圆点和连线
29     //----------------------------------
30     Canvas{
31         id: canvas
32         anchors.fill: grid
33         opacity: 0.6
34         MouseArea{
35             id: area
36             anchors.fill: parent
37             onPressed: checkAndDraw();
38             onPositionChanged: checkAndDraw();
39             // 检测并绘制
40             function checkAndDraw(){
41                 if(area.pressed) {
42                     root.checkLockPoints();
43                     canvas.requestPaint();
44                 }
45             }
46         }
47 
48 
49         onPaint: {
50             var ctx = getContext("2d");
51             ctx.clearRect(0, 0, width, height);
52             drawPasswordGraphy(ctx);
53         }
54 
55         // 绘制密码图
56         function drawPasswordGraphy(ctx){
57             var lastPt = null;
58             for (var i=0; i<lockPoints.length; i++){
59                 var currPt = lockPoints[i];
60                 drawRound(ctx, currPt.center, 30, 'yellow');
61                 if (lastPt != null)
62                     drawLine(ctx, lastPt.center, currPt.center, ptLineWidth, 'yellow');
63                 lastPt = currPt;
64             }
65         }
66 
67         // 绘制圆点
68         function drawRound(ctx, pt, r, c){
69             ctx.beginPath();
70             ctx.arc(pt.x, pt.y, r, 0, 2*Math.PI);
71             ctx.fillStyle = c;
72             ctx.fill();
73         }
74 
75         // 绘制线段
76         function drawLine(ctx, p1, p2, w, c){
77             ctx.beginPath();
78             ctx.moveTo(p1.x, p1.y);
79             ctx.lineTo(p2.x, p2.y);
80             ctx.lineWidth = w;
81             ctx.strokeStyle = c;
82             ctx.stroke();
83         }
84     }