几何不是真的那么糟糕,至少它不像elliptical arc path syntax in SVG那样烦人。两者都可以管理。
下面是将产生一系列弧段作为路径的,(具有任意的元数据一起用于该项目)交给每一个以一个回调函数的函数:
function generateRadialNav(paper, // Raphael's paper object
cx, cy, // x and y coordinates of the center of the circle from which the arcs will be calculated
inner_radius, // pixels from origin to interior arc
radial_thickness, // width of navigation area in pixels
menu_items, // an object with one key per menu item; the value of each key is arbitrary
callback, // a finalization callback for menu items which should accept three arguments: the menu_items key, the path element, and the menu_items value. The first and third parameters are taken directly from the menu_items object.
options) // Unused but added out of habit.
{
options = options || {};
var start_radians = options.start_radians || 0;
var end_radians = options.end_radians || Math.PI/2;
var menu_item_count = 0;
for (var k in menu_items)
menu_item_count++;
var slice_radians = (end_radians - start_radians)/menu_item_count;
var index = 0;
for (var k in menu_items)
{
var path = [];
path.push("M", cx + Math.cos(start_radians + slice_radians * index) * inner_radius, cy + Math.sin(start_radians + slice_radians * index) * inner_radius);
path.push("L", cx + Math.cos(start_radians + slice_radians * index) * (inner_radius + radial_thickness), cy + Math.sin(start_radians + slice_radians * index) * (inner_radius + radial_thickness));
path.push("A",
inner_radius + radial_thickness, inner_radius + radial_thickness,
slice_radians, 0, 1,
cx + Math.cos(start_radians + slice_radians * (index + 1)) * (inner_radius + radial_thickness), cy + Math.sin(start_radians + slice_radians * (index + 1)) * (inner_radius + radial_thickness));
path.push("L", cx + Math.cos(start_radians + slice_radians * (index + 1)) * inner_radius, cy + Math.sin(start_radians + slice_radians * (index + 1)) * inner_radius);
path.push("A",
inner_radius, inner_radius,
slice_radians, 0, 0,
cx + Math.cos(start_radians + slice_radians * index) * inner_radius, cy + Math.sin(start_radians + slice_radians * index) * inner_radius);
path.push("Z");
var element = paper.path(path).attr({ fill: 'none', stroke: 'none' });
callback(k, element, menu_items[k]);
index++;
}
}
该功能将基本上计算该区域每个导航项目,生成具有该形状的路径,然后将菜单定义传递给回调。任何对图标的支持都必须单独添加,但我建议menu_items定义中的数据可以很容易地增加以支持它。对于使用此方法的示例,请查看my test page - 赦免急速的粗糙边缘!当然!
对此有帮助吗? http://stackoverflow.com/questions/5061318/drawing-centered-arcs-in-raphael-js – Spudley
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