获取SVG线,矩形,多边形和圆形标签的长度

Question

我设法在svg中找到路径的长度,但现在我想找到SVG中的line,rect,polygon和circle标签的长度,我现在真的迷失了,还有线索？或者是否已经存在一些像路径一样的功能？

Answer 1

如果其他人想要找到这些标签的长度,我为每个标签制作了一些功能,测试它们,我说它们工作得很好,这就是我需要的.

var tools = {


            /**
             *
             * Used to get the length of a rect
             *
             * @param el is the rect element ex $('.rect')
             * @return the length of the rect in px
             */
            getRectLength:function(el){
                var w = el.attr('width');
                var h = el.attr('height');

                return (w*2)+(h*2);
            },

            /**
             *
             * Used to get the length of a Polygon
             *
             * @param el is the Polygon element ex $('.polygon')
             * @return the length of the Polygon in px
             */
            getPolygonLength:function(el){
                var points = el.attr('points');
                points = points.split(" ");
                var x1 = null, x2, y1 = null, y2 , lineLength = 0, x3, y3;
                for(var i = 0; i < points.length; i++){
                    var coords = points[i].split(",");
                    if(x1 == null && y1 == null){

                        if(/(\r\n|\n|\r)/gm.test(coords[0])){
                            coords[0] = coords[0].replace(/(\r\n|\n|\r)/gm,"");
                            coords[0] = coords[0].replace(/\s+/g,"");
                        }

                        if(/(\r\n|\n|\r)/gm.test(coords[1])){
                            coords[0] = coords[1].replace(/(\r\n|\n|\r)/gm,"");
                            coords[0] = coords[1].replace(/\s+/g,"");
                        }

                        x1 = coords[0];
                        y1 = coords[1];
                        x3 = coords[0];
                        y3 = coords[1];

                    }else{

                        if(coords[0] != "" && coords[1] != ""){             

                            if(/(\r\n|\n|\r)/gm.test(coords[0])){
                                coords[0] = coords[0].replace(/(\r\n|\n|\r)/gm,"");
                                coords[0] = coords[0].replace(/\s+/g,"");
                            }

                            if(/(\r\n|\n|\r)/gm.test(coords[1])){
                                coords[0] = coords[1].replace(/(\r\n|\n|\r)/gm,"");
                                coords[0] = coords[1].replace(/\s+/g,"");
                            }

                            x2 = coords[0];
                            y2 = coords[1];

                            lineLength += Math.sqrt(Math.pow((x2-x1), 2)+Math.pow((y2-y1),2));

                            x1 = x2;
                            y1 = y2;
                            if(i == points.length-2){
                                lineLength += Math.sqrt(Math.pow((x3-x1), 2)+Math.pow((y3-y1),2));
                            }

                        }
                    }

                }
                return lineLength;

            },

            /**
             *
             * Used to get the length of a line
             *
             * @param el is the line element ex $('.line')
             * @return the length of the line in px
             */
            getLineLength:function(el){
                var x1 = el.attr('x1');
                var x2 = el.attr('x2');
                var y1 = el.attr('y1');
                var y2 = el.attr('y2');
                var lineLength = Math.sqrt(Math.pow((x2-x1), 2)+Math.pow((y2-y1),2));
                return lineLength;

            },

            /**
             *
             * Used to get the length of a circle
             *
             * @param el is the circle element
             * @return the length of the circle in px
             */
            getCircleLength:function(el){
                var r = el.attr('r');
                var circleLength = 2 * Math.PI * r; 
                return circleLength;
            },


            /**
             *
             * Used to get the length of the path
             *
             * @param el is the path element
             * @return the length of the path in px
             */
            getPathLength:function(el){
                var pathCoords = el.get(0);
                var pathLength = pathCoords.getTotalLength();
                return pathLength;
            }
        }

Answer 2

我认为你正在错误地看问题:

的长度 rectangle = 2 * (width + height)

线的长度(对于任何非垂直线使用毕达哥拉斯定理c ^ 2 = a ^ 2 + b ^ 2)或使用(x1到x2)用于水平,(y1到y2)用于垂直

圆的长度= 2×π×半径 ......等