[英]KineticJS: Curved line between two draggable shapes
我在項目中使用KineticJS。 我需要使用曲線連接兩個形狀。 可以拖動其中一種形狀。 我能夠在形狀之間放置曲線。 當用戶開始拖動形狀時會出現問題。 要求它應該適當彎曲(請參閱屏幕截圖),而不管它們之間的距離及其相對位置。 我正在這樣做:
var utils = {
_getCenter: function(x1, y1, x2, y2) {
return {
x: (x1 + x2) / 2,
y: (y1 + y2) / 2
}
},
// Converts from degrees to radians.
_radians: function(degrees) {
return degrees * Math.PI / 180;
},
// Converts from radians to degrees.
_degrees: function(radians) {
return radians * 180 / Math.PI;
}
};
function amplitude(point) {
var rad_90 = utils._radians(90);
var rad_45 = utils._radians(45);
var rad_60 = utils._radians(60);
console.log(rad_90);
return {
x: point.x * Math.cos(rad_60),
y: point.y * Math.sin(rad_60)
};
}
var width = window.innerWidth;
var height = window.innerHeight;
var stage = new Kinetic.Stage({
container: 'container',
width: width,
height: height
});
var layer = new Kinetic.Layer();
var circle = new Kinetic.Circle({
x: stage.getWidth() / 2,
y: stage.getHeight() / 2,
radius: 20,
fill: 'red',
stroke: 'black',
strokeWidth: 2
});
var attachedCircle = new Kinetic.Circle({
x: stage.getWidth() / 4,
y: stage.getHeight() / 4,
radius: 20,
fill: 'red',
stroke: 'black',
strokeWidth: 2,
draggable: true
});
var center = amplitude(utils._getCenter(circle.getX(), circle.getY(), attachedCircle.getX(), attachedCircle.getY()));
var line = new Kinetic.Line({
points: [circle.getX(), circle.getY(), center.x, center.y, attachedCircle.getX(), attachedCircle.getY()],
fill: 'black',
stroke: 'green',
strokeWidth: 3,
/*
* line segments with a length of 33px
* with a gap of 10px
*/
dash: [33, 10],
id: 'line',
tension: 0.5
});
attachedCircle.on('dragmove', function(e) {
var targetCircle = e.target;
var tempCenter = amplitude(utils._getCenter(circle.getX(), circle.getY(), targetCircle.getX(), targetCircle.getY()));
console.log(tempCenter);
line.setPoints([circle.getX(), circle.getY(), tempCenter.x, tempCenter.y, targetCircle.getX(), targetCircle.getY()]);
});
// add the shape to the layer
layer.add(line);
layer.add(attachedCircle);
layer.add(circle);
// add the layer to the stage
stage.add(layer);
要定義振幅函數,您需要使用兩個輸入點:
function amplidure2(p1, p2) {
var alpha = Math.atan((p1.x - p2.x) / (p1.y - p2.y)) + Math.PI / 2;
if (p1.y < p2.y) {
alpha += Math.PI;
}
var center = utils._getCenter(p1.x, p1.y, p2.x, p2.y);
var r = 50;
return {
x: center.x + r * Math.sin(alpha),
y: center.y + r * Math.cos(alpha)
}
}
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