我需要帮助为我使用raphael.js修改的圆环图脚本添加标记.除了动态生成三角形标记的方法外,我已经准备好了大部分内容.
@H_502_2@JSFiddle：http://jsfiddle.net/aP7MK/73/
function donutChart(total,goal,avg){
var paper = Raphael("canvas",400,400);
paper.customAttributes.arc = function (xloc,yloc,value,total,R) {
var alpha = 360 / total * value,a = (90 - alpha) * Math.PI / 180,x = xloc + R * Math.cos(a),y = yloc - R * Math.sin(a),path;
if (total == value) {
path = [
["M",xloc,yloc - R],["A",R,1,xloc - 0.01,yloc - R]
];
} else {
path = [
["M",+(alpha > 180),x,y]
];
}
return {
path: path
};
};
var backCircle = paper.circle(100,100,40).attr({
"stroke": "#7BC2E5","stroke-width": 14
});
var theArc = paper.path().attr({
"stroke": "#f5f5f5","stroke-width": 14,arc: [100,40]
});
//event fired on each animation frame
eve.on("raphael.anim.frame.*",onAnimate);
//text in the middle
theText = paper.text(100,"0%").attr({
"font-size": 18,"fill": "#f5f5f5","font-weight": "bold"
});
//the animated arc
theArc.rotate(0,100).animate({
arc: [100,((total/goal) * 100),40]
},1900);
//on each animation frame we change the text in the middle
function onAnimate() {
var howMuch = theArc.attr("arc");
theText.attr("text",Math.floor(howMuch[2]) + "%");
}
}
donutChart(80,140,40);
@H_502_2@这是我最终要创建的内容：
@H_502_2@我并不担心样式,只需要帮助标记元素,这将表示传递给donutChart函数的avg参数位于图表中的位置.
解决方法
正如@Ian所说,您可以使用路径绘制三角形：
// triangle
var tri = paper.path("M100 50 L90 40 L110 40 L100 50 Z");
@H_502_2@请参阅docs关于使用路径(其命令).
@H_502_2@然后你需要旋转/翻译(再次像@Ian所说)但是SVG帮助你提供rotate方法,它不仅需要旋转角度,还需要旋转点的坐标(它为你转换坐标)
tri.rotate((howMuch[2] - prev_percent) * 3.6,100);@H_502_2@这里唯一需要注意的是,您需要先前和当前百分比的差异. @H_502_2@工作fiddle
