Javascript 沿着路径Paper.js滚动
基本上我想沿着路径滚动一个对象。我见过几个线程不使用paper.js寻找类似的解决方案,但我想知道paper.js是否可能。或者有人可以给我一个工作的JSFIDLE对象跟随svg曲线,因为我无法让任何东西工作。我最终想让一连串的div沿着这条路走Javascript 沿着路径Paper.js滚动,javascript,path,scroll,paperjs,Javascript,Path,Scroll,Paperjs,基本上我想沿着路径滚动一个对象。我见过几个线程不使用paper.js寻找类似的解决方案,但我想知道paper.js是否可能。或者有人可以给我一个工作的JSFIDLE对象跟随svg曲线,因为我无法让任何东西工作。我最终想让一连串的div沿着这条路走 // vars var point1 = [0, 100]; var point2 = [120, 100]; var point3 = [120, 150]; // draw the line var path = new Path(); path
// vars
var point1 = [0, 100];
var point2 = [120, 100];
var point3 = [120, 150];
// draw the line
var path = new Path();
path.add(new Point(point1), new Point(point2), new Point(point3));
path.strokeColor = "#FFF";
path.closed = true;
// draw the circle
var circle = new Path.Circle(0,100,4);
circle.strokeColor = "#FFF";
// target to move to
var target = point2;
// how many frame does it take to reach a target
var steps = 200;
// defined vars for onFrame
var dX = 0;
var dY = 0;
// position circle on path
circle.position.x = target[0];
circle.position.y = target[1];
function onFrame(event) {
//check if cricle reached its target
if (Math.round(circle.position.x) == target[0] && Math.round(circle.position.y) == target[1]) {
switch(target) {
case point1:
target = point2;
break;
case point2:
target = point3;
break;
case point3:
target = point1;
break;
}
// calculate the dX and dY
dX = (target[0] - circle.position.x)/steps;
dY = (target[1] - circle.position.y)/steps;
}
// do the movement
//circle.position.x += dX;
//circle.position.y += dY;
}
以下是JSFIDLE:
谢谢 您可以使用path.getPointAtoffset沿路径找到一个点,其中偏移量是沿路径长度以点为单位测量的。如果可以计算滑块沿其轨迹的位置,则可以将其乘以path.length以获得偏移 可以使用HTML滑块或canvas元素执行此操作,如下所示:
// vars
var point1 = [0, 100];
var point2 = [120, 100];
var point3 = [120, 150];
// draw the line
var path = new Path();
path.add(new Point(point1), new Point(point2), new Point(point3));
path.strokeColor = "#FFF";
path.closed = true;
// draw the circle
var circle = new Path.Circle(0,100,4);
circle.strokeColor = "#FFF";
// slider
var sliderLine = new Path(new Point(10,30.5), new Point(210, 30.5));
sliderLine.strokeColor = '#FFF';
var sliderKnob = new Path.Circle(new Point(10,30.5), 5);
sliderKnob.fillColor = '#FFF';
var sliderHit = false;
function onMouseDown(event) {
if (event.item == sliderKnob) sliderHit = true;
}
function onMouseDrag(event) {
if (sliderHit === true) {
if (event.point.x > 10 && event.point.x < 210) {
sliderKnob.position.x = event.point.x;
}
else if (event.point.x < 11) {
sliderKnob.position.x = 10;
}
else if (event.point.x > 209) {
sliderKnob.position.x = 210;
}
// Get offset and set circle position
var percent = ( sliderKnob.position.x - 10 ) / 200;
circle.position = path.getPointAt(path.length * percent);
}
}
function onMouseUp(event) {
sliderHit = false;
}
jsfiddle:
单击并沿直线拖动填充的圆,以沿三角形移动圆。您的问题不清楚-您能否解释一下使用滚动条按比例跟随路径的意思?另外,请记住paper.js不是移动外部div的最佳工具,而是在canvas元素中显示图形。基本上我想沿着路径滚动对象。你想沿着三角形路径移动圆吗?是的,通过滚动谢谢!虽然我想用鼠标滚轮来控制它,但我可以从这里开始。