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GooeyTail.qml
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GooeyTail.qml
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/*!
* author: qyvlik
*/
import QtQuick 2.0
Canvas {
id: gooeyTail
width: 400
height: 200
clip: false
property real bigRadius: gooeyTail.height / 2
property real smallRasius: bigRadius * 0.5
readonly property point
bigCirclePoint: Qt.point(bigCircle.x + bigCircle.radius,
bigCircle.y + bigCircle.radius)
readonly property point
smallCirclePoint: Qt.point(smallCircle.x +smallCircle.radius,
smallCircle.y + smallCircle.radius)
Circle {
id: smallCircle
x: gooeyTail.width / 2 - smallCircle.radius
y: gooeyTail.height / 2 - smallCircle.radius
radius: gooeyTail.smallRasius
color: "black"
onXChanged: {
gooeyTail.requestPaint();
}
}
Circle {
id: bigCircle
x: gooeyTail.width / 2 - bigCircle.radius
y: gooeyTail.height / 2 - bigCircle.radius
radius: gooeyTail.bigRadius
color: "black"
// opacity: 0.5
}
state: "shrink"
states: [
State {
// 伸展
name: "stretch"
PropertyChanges {
target: smallCircle
x: 0
}
},
State {
// 收缩
name: "shrink"
PropertyChanges {
target: smallCircle
x: gooeyTail.width / 2 - smallCircle.radius
}
}
]
transitions: [
Transition {
// 从伸展到收缩
// 收缩中
from: "stretch"
to: "shrink"
NumberAnimation { properties: "x"
easing.type: Easing.OutQuad
duration: 250
}
},
Transition {
// 从收缩到伸展
// 伸展中
from: "shrink"
to: "stretch"
NumberAnimation {
properties: "x"
easing.type: Easing.InCubic
duration: 300
}
}
]
onPaint: {
var ctx = getContext("2d");
ctx.clearRect(0, 0, width, height);
// 两圆心距离
var distance = centerDistance(bigCirclePoint, smallCirclePoint);
// 圆心距越大,小圆半径越小
//var k = smallRasius * ((width - distance * 2) / width);
var k = smallRasius
k = k < 0 ? 0: k;
// 绘制小圆
smallCircle.radius = k;
// 获取小圆信息
var x1 = smallCirclePoint.x;
var y1 = smallCirclePoint.y;
var r1 = k;
// 绘制大圆
bigCircle.radius = bigRadius;
// 获取大圆信息
var x2 = bigCirclePoint.x;
var y2 = bigCirclePoint.y;
var r2 = bigRadius ;
var sinA = (y2 - y1) / distance;
var cosA = (x2 - x1) / distance;
var pointA = Qt.point(x1 - sinA*r1, y1 + cosA * r1);
var pointB = Qt.point(x1 + sinA*r1, y1 - cosA * r1);
var pointC = Qt.point(x2 + sinA*r2, y2 - cosA * r2);
var pointD = Qt.point(x2 - sinA*r2, y2 + cosA * r2);
// 获取控制点,以便画出曲线
var pointO = Qt.point(pointA.x + distance / 2 * cosA ,
pointA.y + distance / 2 * sinA);
var pointP = Qt.point(pointB.x + distance / 2 * cosA ,
pointB.y + distance / 2 * sinA);
ctx.lineWidth = 0;
ctx.fillStyle = "black";
// Adds a quadratic bezier curve between the current point and the endpoint (x, y)
// with the control point specified by (cpx, cpy).
// quadraticCurveT(real cpx, real cpy, real x, real y)
// 第一二个是控制点,第三四个是终点。
ctx.beginPath();
ctx.moveTo(pointA.x, pointA.y);
ctx.lineTo(pointB.x, pointB.y);
ctx.quadraticCurveTo(pointP.x, pointP.y,
pointC.x , pointC.y);
ctx.lineTo(pointD.x, pointD.y);
ctx.quadraticCurveTo(pointO.x, pointO.y,
pointA.x , pointA.y);
ctx.fill();
}
// 圆心距
function centerDistance(point0, point1){
return Math.abs(Math.sqrt(Math.pow(point0.x-point1.x, 2)
+
Math.pow(point0.y-point1.y, 2)));
}
function stretch() {
gooeyTail.state = "stretch";
}
function shrink() {
gooeyTail.state = "shrink";
}
}