Javascript Paperjs metaballs不工作/显示
我试图从Paperjs()中定制metaballs示例。问题是,即使复制粘贴它,也不会起作用。它不会绘制/显示球之间的“桥” 下面是一个JSFIDLE: 下面是代码:Javascript Paperjs metaballs不工作/显示,javascript,paperjs,Javascript,Paperjs,我试图从Paperjs()中定制metaballs示例。问题是,即使复制粘贴它,也不会起作用。它不会绘制/显示球之间的“桥” 下面是一个JSFIDLE: 下面是代码: $(document).ready(function () { // Get a reference to the canvas object var canvas = document.getElementById('canvas'); // Create an empty project and a
$(document).ready(function () {
// Get a reference to the canvas object
var canvas = document.getElementById('canvas');
// Create an empty project and a view for the canvas:
paper.setup(canvas);
// Create a simple drawing tool:
var tool = new paper.Tool();
// Ported from original Metaball script by SATO Hiroyuki
// http://park12.wakwak.com/~shp/lc/et/en_aics_script.html
paper.project.currentStyle = {
fillColor: 'black'
};
var ballPositions = [[255, 129], [610, 73], [486, 163],
[117, 259], [484, 326], [843, 306], [789, 215], [949, 82],
[292, 128], [917, 233], [352, 86], [92, 98]];
var handle_len_rate = 2.4;
var circlePaths = [];
var radius = 50;
for (var i = 0, l = ballPositions.length; i < l; i++) {
var circlePath = new paper.Path.Circle({
center: ballPositions[i],
radius: 50
});
circlePaths.push(circlePath);
}
var largeCircle = new paper.Path.Circle({
center: paper.view.center,
radius: 100,
fillColor: 'green'
});
circlePaths.push(largeCircle);
tool.onMouseMove = function(event) {
largeCircle.position = event.point;
generateConnections(circlePaths);
}
var connections = new paper.Group(); var thePath;
function generateConnections(paths) {
// Remove the last connection paths:
connections.children = [];
for (var i = 0, l = paths.length; i < l; i++) {
for (var j = i - 1; j >= 0; j--) {
var path = metaball(paths[i], paths[j], 0.5, handle_len_rate, 300);thePath = path;
if (path) {
connections.appendTop(path);
path.removeOnMove();
}
}
}
}
generateConnections(circlePaths);
// ---------------------------------------------
function metaball(ball1, ball2, v, handle_len_rate, maxDistance) {
var center1 = ball1.position;
var center2 = ball2.position;
var radius1 = ball1.bounds.width / 2;
var radius2 = ball2.bounds.width / 2;
var pi2 = Math.PI / 2;
var d = center1.getDistance(center2);
var u1, u2;
if (radius1 == 0 || radius2 == 0)
return;
if (d > maxDistance || d <= Math.abs(radius1 - radius2)) {
return;
} else if (d < radius1 + radius2) { // case circles are overlapping
u1 = Math.acos((radius1 * radius1 + d * d - radius2 * radius2) /
(2 * radius1 * d));
u2 = Math.acos((radius2 * radius2 + d * d - radius1 * radius1) /
(2 * radius2 * d));
} else {
u1 = 0;
u2 = 0;
}
var angle1 = center2.subtract(center1).getAngleInRadians();
var angle2 = Math.acos((radius1 - radius2) / d);
var angle1a = angle1 + u1 + (angle2 - u1) * v;
var angle1b = angle1 - u1 - (angle2 - u1) * v;
var angle2a = angle1 + Math.PI - u2 - (Math.PI - u2 - angle2) * v;
var angle2b = angle1 - Math.PI + u2 + (Math.PI - u2 - angle2) * v;
var p1a = center1 + getVector(angle1a, radius1);
var p1b = center1 + getVector(angle1b, radius1);
var p2a = center2 + getVector(angle2a, radius2);
var p2b = center2 + getVector(angle2b, radius2);
// define handle length by the distance between
// both ends of the curve to draw
var totalRadius = (radius1 + radius2);
var d2 = Math.min(v * handle_len_rate, (p1a - p2a).length / totalRadius);
// case circles are overlapping:
d2 *= Math.min(1, d * 2 / (radius1 + radius2));
radius1 *= d2;
radius2 *= d2;
var path = new paper.Path({
segments: [p1a, p2a, p2b, p1b],
style: ball1.style,
closed: true
});
var segments = path.segments;
segments[0].handleOut = getVector(angle1a - pi2, radius1);
segments[1].handleIn = getVector(angle2a + pi2, radius2);
segments[2].handleOut = getVector(angle2b - pi2, radius2);
segments[3].handleIn = getVector(angle1b + pi2, radius1);
return path;
}
// ------------------------------------------------
function getVector(radians, length) {
return new paper.Point({
// Convert radians to degrees:
angle: radians * 180 / Math.PI,
length: length
});
}
});
$(文档).ready(函数(){
//获取对画布对象的引用
var canvas=document.getElementById('canvas');
//为画布创建空项目和视图:
纸。设置(画布);
//创建一个简单的绘图工具:
var-tool=新纸张.tool();
//从SATO Hiroyuki的原始Metaball脚本移植而来
// http://park12.wakwak.com/~shp/lc/et/en_aics_script.html
paper.project.currentStyle={
fillColor:'黑色'
};
var ballPositions=[[255,129],[610,73],[486163],
[117, 259], [484, 326], [843, 306], [789, 215], [949, 82],
[292, 128], [917, 233], [352, 86], [92, 98]];
风险值处理率=2.4;
var circlePaths=[];
var半径=50;
对于(变量i=0,l=ballPositions.length;i=0;j--){
var path=metaball(路径[i],路径[j],0.5,句柄长度率,300);path=path;
如果(路径){
连接。追加顶部(路径);
path.removeOnMove();
}
}
}
}
发电连接(循环路径);
// ---------------------------------------------
函数元球(球1、球2、v、手柄长度率、最大距离){
var center1=1.0位置;
var center2=ball2.0位置;
var radius1=ball1.bounds.width/2;
var radius2=ball2.bounds.width/2;
var pi2=Math.PI/2;
变量d=中心1.获取距离(中心2);
var u1,u2;
如果(半径1==0 | |半径2==0)
返回;
如果(d>maxDistance | | d发现了缺失的内容。Paperjs上没有很好的文档记录,无论如何,如果您像常规javascript一样使用它,请确保纸张对象(点、路径等)上的所有操作都表示为方法,而不是运算符
错误
var d2 = Math.min(v * handle_len_rate, (point1a - point2a).length / totalRadius);
对
var d2 = Math.min(v * handle_len_rate, point1a.subtract(point2a).length / totalRadius);
我也在尝试在JS中实现Metaballs示例。我不明白你为什么不在divide上使用方法,例如?你必须更改多少操作才能在JS中运行它?你不需要在divide上使用方法,因为我们只有数字(长度/半径)。问题是纸张对象(pointA-pointB)。谢谢,但是这个减法方法在哪里有文档记录?当我尝试像上面那样使用它时,我得到:Uncaught TypeError:p1a.subtract不是一个函数。
这是他们教程的相关部分:。很抱歉,很长一段时间过去了,我没有使用paperjs,无法提供更多帮助:)为了使p1a.subtract
工作,您需要首先通过var p1a=center1.add(getVector(angle1a,radius1))
创建p1a
,它可以正确处理点添加操作。