这是函数的源代码,它允许您绘制带有弯曲角的漂亮线条。您可以创建Konva.Line
对象并向参数添加特殊sceneFunc
功能。
const BORDER_RADIUS = 40;
let line = new Konva.Line({
points:[0,0,100,0,100,100,200,100], // put you points array here
stroke:'#000000',
strokeWidth:2,
sceneFunc: function(ctx,shape){
let points = shape.points();
ctx.beginPath();
ctx.moveTo(points[0],points[1]);
if (points.length == 4) {
ctx.lineTo(points[2],points[3]);
} else {
let n = 0;
while (n < points.length-4) {
let deltaX1 = (points[n+2] - points[n+0]);
let deltaY1 = (points[n+3] - points[n+1]);
let br1 = Math.min(BORDER_RADIUS,Math.max(Math.abs(deltaX1/2),Math.abs(deltaY1/2)));
let deltaX2 = (points[n+2+2] - points[n+0+2]);
let deltaY2 = (points[n+3+2] - points[n+1+2]);
let br2 = Math.min(BORDER_RADIUS,Math.max(Math.abs(deltaX2/2),Math.abs(deltaY2/2)));
let br = Math.min(br1,br2);
let oneX = points[n+0] + (Math.abs(deltaX1) - br)*Math.sign(deltaX1);
let oneY = points[n+1] + (Math.abs(deltaY1) - br)*Math.sign(deltaY1);
ctx.lineTo(oneX, oneY);
n+=2;
let twoX = points[n+0] + (br)*Math.sign(deltaX2);
let twoY = points[n+1] + (br)*Math.sign(deltaY2);
ctx.quadraticCurveTo(points[n+0], points[n+1],twoX, twoY);
}
ctx.lineTo(points[points.length-2],points[points.length-1]);
}
ctx.strokeShape(shape);
}
}