Question

我希望能够在paperjs中的预定义路径上拖动鼠标，并且有一个＆＃34;粘性＆＃34;圆圈标记大致在我的鼠标沿着该路径的位置，圆圈的中心位于路径上。

我设法获得pretty close - 以下内容完全符合我想要的直线，但它不会在扭结附近工作，并且圆圈的中心位于＆＃34; ＃34;从行：

var path = new Path();
path.strokeColor = 'black';
path.moveTo([50,50]);
path.lineTo([100,100]);
path.lineTo([150,50]);

var cursorCircle = new Path.Circle({radius: 5,
                                    strokeColor: 'blue',
                                    visible: false});

function onMouseMove(event) {
  cursorCircle.position = event.point;

  var intersections = path.getIntersections(cursorCircle);
  if (intersections.length >= 2) {
    cursorCircle.position = (intersections[0].point + intersections[1].point)/2;
    cursorCircle.visible = true;
  } else if (intersections.length == 1) {
    cursorCircle.position = intersections[0].point;
    cursorCircle.visible = true;
  } else {
    cursorCircle.visible = false;
  }
}

如何将圆圈始终保持在线上（假设光标足够接近）？

Answer 1

在reference中找到答案：

var star = new Path.Star({
    center: view.center,
    points: 10,
    radius1: 30,
    radius2: 60,
    strokeColor: 'black'
});

var circle = new Path.Circle({
    center: view.center,
    radius: 3,
    fillColor: 'red'
});

function onMouseMove(event) {
    // Get the nearest point from the mouse position
    // to the star shaped path:
    var nearestPoint = star.getNearestPoint(event.point);

    // Move the red circle to the nearest point:
    circle.position = nearestPoint;
}

＆＃34;粘＆＃34;光标沿着paperjs中的路径

1 个答案: