svg-path-properties - npm Package Compare versions

Comparing version 0.1.3 to 0.2.1

build/path-properties.js

@@ -1,2 +0,2 @@
-// http://geoexamples.com/path-properties/ Version 0.1.3. Copyright 2017 Roger Veciana i Rovira.
+// http://geoexamples.com/path-properties/ Version 0.2.1. Copyright 2017 Roger Veciana i Rovira.
 (function (global, factory) {
@@ -338,2 +338,274 @@ typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
 
+//This file is taken from the following project: https://github.com/fontello/svgpath
+// Convert an arc to a sequence of cubic bézier curves
+//
+var TAU = Math.PI * 2;
+
+
+/* eslint-disable space-infix-ops */
+
+// Calculate an angle between two unit vectors
+//
+// Since we measure angle between radii of circular arcs,
+// we can use simplified math (without length normalization)
+//
+function unit_vector_angle(ux, uy, vx, vy) {
+  var sign = (ux * vy - uy * vx < 0) ? -1 : 1;
+  var dot  = ux * vx + uy * vy;
+
+  // Add this to work with arbitrary vectors:
+  // dot /= Math.sqrt(ux * ux + uy * uy) * Math.sqrt(vx * vx + vy * vy);
+
+  // rounding errors, e.g. -1.0000000000000002 can screw up this
+  if (dot >  1.0) { dot =  1.0; }
+  if (dot < -1.0) { dot = -1.0; }
+
+  return sign * Math.acos(dot);
+}
+
+
+// Convert from endpoint to center parameterization,
+// see http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
+//
+// Return [cx, cy, theta1, delta_theta]
+//
+function get_arc_center(x1, y1, x2, y2, fa, fs, rx, ry, sin_phi, cos_phi) {
+  // Step 1.
+  //
+  // Moving an ellipse so origin will be the middlepoint between our two
+  // points. After that, rotate it to line up ellipse axes with coordinate
+  // axes.
+  //
+  var x1p =  cos_phi*(x1-x2)/2 + sin_phi*(y1-y2)/2;
+  var y1p = -sin_phi*(x1-x2)/2 + cos_phi*(y1-y2)/2;
+
+  var rx_sq  =  rx * rx;
+  var ry_sq  =  ry * ry;
+  var x1p_sq = x1p * x1p;
+  var y1p_sq = y1p * y1p;
+
+  // Step 2.
+  //
+  // Compute coordinates of the centre of this ellipse (cx', cy')
+  // in the new coordinate system.
+  //
+  var radicant = (rx_sq * ry_sq) - (rx_sq * y1p_sq) - (ry_sq * x1p_sq);
+
+  if (radicant < 0) {
+    // due to rounding errors it might be e.g. -1.3877787807814457e-17
+    radicant = 0;
+  }
+
+  radicant /=   (rx_sq * y1p_sq) + (ry_sq * x1p_sq);
+  radicant = Math.sqrt(radicant) * (fa === fs ? -1 : 1);
+
+  var cxp = radicant *  rx/ry * y1p;
+  var cyp = radicant * -ry/rx * x1p;
+
+  // Step 3.
+  //
+  // Transform back to get centre coordinates (cx, cy) in the original
+  // coordinate system.
+  //
+  var cx = cos_phi*cxp - sin_phi*cyp + (x1+x2)/2;
+  var cy = sin_phi*cxp + cos_phi*cyp + (y1+y2)/2;
+
+  // Step 4.
+  //
+  // Compute angles (theta1, delta_theta).
+  //
+  var v1x =  (x1p - cxp) / rx;
+  var v1y =  (y1p - cyp) / ry;
+  var v2x = (-x1p - cxp) / rx;
+  var v2y = (-y1p - cyp) / ry;
+
+  var theta1 = unit_vector_angle(1, 0, v1x, v1y);
+  var delta_theta = unit_vector_angle(v1x, v1y, v2x, v2y);
+
+  if (fs === 0 && delta_theta > 0) {
+    delta_theta -= TAU;
+  }
+  if (fs === 1 && delta_theta < 0) {
+    delta_theta += TAU;
+  }
+
+  return [ cx, cy, theta1, delta_theta ];
+}
+
+//
+// Approximate one unit arc segment with bézier curves,
+// see http://math.stackexchange.com/questions/873224
+//
+function approximate_unit_arc(theta1, delta_theta) {
+  var alpha = 4/3 * Math.tan(delta_theta/4);
+
+  var x1 = Math.cos(theta1);
+  var y1 = Math.sin(theta1);
+  var x2 = Math.cos(theta1 + delta_theta);
+  var y2 = Math.sin(theta1 + delta_theta);
+
+  return [ x1, y1, x1 - y1*alpha, y1 + x1*alpha, x2 + y2*alpha, y2 - x2*alpha, x2, y2 ];
+}
+
+var a2c = function(x1, y1, rx, ry, phi, fa, fs, x2, y2) {
+  var sin_phi = Math.sin(phi * TAU / 360);
+  var cos_phi = Math.cos(phi * TAU / 360);
+
+  // Make sure radii are valid
+  //
+  var x1p =  cos_phi*(x1-x2)/2 + sin_phi*(y1-y2)/2;
+  var y1p = -sin_phi*(x1-x2)/2 + cos_phi*(y1-y2)/2;
+
+  if (x1p === 0 && y1p === 0) {
+    // we're asked to draw line to itself
+    return [];
+  }
+
+  if (rx === 0 || ry === 0) {
+    // one of the radii is zero
+    return [];
+  }
+
+
+  // Compensate out-of-range radii
+  //
+  rx = Math.abs(rx);
+  ry = Math.abs(ry);
+
+  var lambda = (x1p * x1p) / (rx * rx) + (y1p * y1p) / (ry * ry);
+  if (lambda > 1) {
+    rx *= Math.sqrt(lambda);
+    ry *= Math.sqrt(lambda);
+  }
+
+
+  // Get center parameters (cx, cy, theta1, delta_theta)
+  //
+  var cc = get_arc_center(x1, y1, x2, y2, fa, fs, rx, ry, sin_phi, cos_phi);
+
+  var result = [];
+  var theta1 = cc[2];
+  var delta_theta = cc[3];
+
+  // Split an arc to multiple segments, so each segment
+  // will be less than τ/4 (= 90°)
+  //
+  var segments = Math.max(Math.ceil(Math.abs(delta_theta) / (TAU / 4)), 1);
+  delta_theta /= segments;
+
+  for (var i = 0; i < segments; i++) {
+    result.push(approximate_unit_arc(theta1, delta_theta));
+    theta1 += delta_theta;
+  }
+
+  // We have a bezier approximation of a unit circle,
+  // now need to transform back to the original ellipse
+  //
+  return result.map(function (curve) {
+    for (var i = 0; i < curve.length; i += 2) {
+      var x = curve[i + 0];
+      var y = curve[i + 1];
+
+      // scale
+      x *= rx;
+      y *= ry;
+
+      // rotate
+      var xp = cos_phi*x - sin_phi*y;
+      var yp = sin_phi*x + cos_phi*y;
+
+      // translate
+      curve[i + 0] = xp + cc[0];
+      curve[i + 1] = yp + cc[1];
+    }
+
+    return curve;
+  });
+};
+
+//Calculate ans Arc curve length and positionAtLength
+//Definitions taken from https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Paths
+var Arc = function(x0, y0, rx,ry, xAxisRotate, LargeArcFlag,SweepFlag, x,y) {
+  return new Arc$1(x0, y0, rx,ry, xAxisRotate, LargeArcFlag,SweepFlag, x,y);
+};
+
+function Arc$1(x0, y0,rx,ry, xAxisRotate, LargeArcFlag,SweepFlag,x,y) {
+    var length = 0;
+    var partialLengths = [];
+    var curves = [];
+    var res = a2c(x0, y0,rx,ry, xAxisRotate, LargeArcFlag,SweepFlag,x,y);
+    res.forEach(function(d){
+        var curve = new Bezier(d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7]);
+        var curveLength = curve.getTotalLength();
+        length += curveLength;
+        partialLengths.push(curveLength);
+        curves.push(curve);
+    });
+    this.length = length;
+    this.partialLengths = partialLengths;
+    this.curves = curves;
+}
+
+Arc$1.prototype = {
+  constructor: Arc$1,
+  init: function() {
+
+    
+  },
+
+  getTotalLength: function() {
+    return this.length;
+  },
+  getPointAtLength: function(fractionLength) {
+    
+    if(fractionLength < 0){
+      fractionLength = 0;
+    } else if(fractionLength > this.length){
+      fractionLength = this.length;
+    }
+    var i = this.partialLengths.length - 1;
+
+    while(this.partialLengths[i] >= fractionLength && this.partialLengths[i] > 0){
+      i--;
+    }
+    if(i<this.partialLengths.length-1){
+        i++;
+    }
+
+    var lengthOffset = 0;
+    for(var j=0; j<i; j++){
+        lengthOffset += this.partialLengths[j];
+    }
+
+    return this.curves[i].getPointAtLength(fractionLength - lengthOffset);
+  },
+  getTangentAtLength: function(fractionLength) {
+    if(fractionLength < 0){
+        fractionLength = 0;
+        } else if(fractionLength > this.length){
+        fractionLength = this.length;
+        }
+        var i = this.partialLengths.length - 1;
+
+        while(this.partialLengths[i] >= fractionLength && this.partialLengths[i] > 0){
+        i--;
+        }
+        if(i<this.partialLengths.length-1){
+            i++;
+        }
+
+        var lengthOffset = 0;
+        for(var j=0; j<i; j++){
+            lengthOffset += this.partialLengths[j];
+        }
+
+    return this.curves[i].getTangentAtLength(fractionLength - lengthOffset);
+  },
+  getPropertiesAtLength: function(fractionLength){
+    var tangent = this.getTangentAtLength(fractionLength);
+    var point = this.getPointAtLength(fractionLength);
+    return {x: point.x, y: point.y, tangentX: tangent.x, tangentY: tangent.y};
+  }
+};
+
 var LinearPosition = function(x0, x1, y0, y1) {
@@ -491,2 +763,14 @@ return new LinearPosition$1(x0, x1, y0, y1);
         functions.push(curve);
+      } else if(parsed[i][0] === "A"){
+        curve = new Arc(cur[0], cur[1], parsed[i][1], parsed[i][2], parsed[i][3], parsed[i][4], parsed[i][5], parsed[i][6], parsed[i][7]);
+
+        length = length + curve.getTotalLength();
+        cur = [parsed[i][6], parsed[i][7]];
+        functions.push(curve);
+      } else if(parsed[i][0] === "a"){
+        curve = new Arc(cur[0], cur[1], parsed[i][1], parsed[i][2], parsed[i][3], parsed[i][4], parsed[i][5], cur[0] + parsed[i][6], cur[1] + parsed[i][7]);
+
+        length = length + curve.getTotalLength();
+        cur = [cur[0] + parsed[i][6], cur[1] + parsed[i][7]];
+        functions.push(curve);
       }
@@ -493,0 +777,0 @@ partial_lengths.push(length);

build/path-properties.min.js

@@ -1,2 +0,2 @@
-// http://geoexamples.com/path-properties/ Version 0.1.3. Copyright 2017 Roger Veciana i Rovira.
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b(a[0],a[1],a[0],a[1],r[g][1],r[g][2],r[g][3],r[g][4]),h+=s.getTotalLength(),a=[r[g][3],r[g][4]],i.push(s)):"s"===r[g][0]?(s=g>0&&["C","c","S","s"].indexOf(r[g-1][0])>-1?new b(a[0],a[1],a[0]+s.d.x-s.c.x,a[1]+s.d.y-s.c.y,a[0]+r[g][1],a[1]+r[g][2],a[0]+r[g][3],a[1]+r[g][4]):new b(a[0],a[1],a[0],a[1],a[0]+r[g][1],a[1]+r[g][2],a[0]+r[g][3],a[1]+r[g][4]),h+=s.getTotalLength(),a=[r[g][3]+a[0],r[g][4]+a[1]],i.push(s)):"Q"===r[g][0]?(s=new b(a[0],a[1],r[g][1],r[g][2],r[g][3],r[g][4]),h+=s.getTotalLength(),i.push(s),a=[r[g][3],r[g][4]],o=[r[g][1],r[g][2]]):"q"===r[g][0]?(s=new b(a[0],a[1],a[0]+r[g][1],a[1]+r[g][2],a[0]+r[g][3],a[1]+r[g][4]),h+=s.getTotalLength(),o=[a[0]+r[g][1],a[1]+r[g][2]],a=[r[g][3]+a[0],r[g][4]+a[1]],i.push(s)):"T"===r[g][0]?(s=g>0&&["Q","q","T","t"].indexOf(r[g-1][0])>-1?new b(a[0],a[1],2*a[0]-o[0],2*a[1]-o[1],r[g][1],r[g][2]):new O(a[0],r[g][1],a[1],r[g][2]),i.push(s),h+=s.getTotalLength(),o=[2*a[0]-o[0],2*a[1]-o[1]],a=[r[g][1],r[g][2]]):"t"===r[g][0]?(s=g>0&&["Q","q","T","t"].indexOf(r[g-1][0])>-1?new b(a[0],a[1],2*a[0]-o[0],2*a[1]-o[1],a[0]+r[g][1],a[1]+r[g][2]):new O(a[0],a[0]+r[g][1],a[1],a[1]+r[g][2]),h+=s.getTotalLength(),o=[2*a[0]-o[0],2*a[1]-o[1]],a=[r[g][1]+a[0],r[g][2]+a[0]],i.push(s)):"A"===r[g][0]?(s=new z(a[0],a[1],r[g][1],r[g][2],r[g][3],r[g][4],r[g][5],r[g][6],r[g][7]),h+=s.getTotalLength(),a=[r[g][6],r[g][7]],i.push(s)):"a"===r[g][0]&&(s=new z(a[0],a[1],r[g][1],r[g][2],r[g][3],r[g][4],r[g][5],a[0]+r[g][6],a[1]+r[g][7]),h+=s.getTotalLength(),a=[a[0]+r[g][6],a[1]+r[g][7]],i.push(s)),e.push(h);return n}var h=0,e=[],i=[];n.getTotalLength=function(){return h},n.getPointAtLength=function(t){var n=s(t);return i[n.i].getPointAtLength(n.fraction)},n.getTangentAtLength=function(t){var n=s(t);return i[n.i].getTangentAtLength(n.fraction)},n.getPropertiesAtLength=function(t){var n=s(t);return i[n.i].getPropertiesAtLength(n.fraction)};var s=function(t){t<0?t=0:t>h&&(t=h);for(var n=e.length-1;e[n]>=t&&e[n]>0;)n--;return n++,{fraction:t-e[n-1],i:n}};return n(t)};t.svgPathProperties=C,t.parse=w,t.Bezier=b,Object.defineProperty(t,"__esModule",{value:!0})});

package.json

 {
   "name": "svg-path-properties",
-  "version": "0.1.3",
+  "version": "0.2.1",
   "description": "Calculate the length for an SVG path, to use it with node or a Canvas element",
@@ -23,3 +23,4 @@ "keywords": [
     "prepublish": "npm run test && uglifyjs --preamble \"$(preamble)\" build/path-properties.js -c -m -o build/path-properties.min.js",
-    "postpublish": "git push && git push --tags"
+    "postpublish": "git push && git push --tags",
+    "postversion": "npm run prepublish"
   },
@@ -26,0 +27,0 @@ "author": {

src/path-properties.js

 import parse from "./parse";
 import Bezier from "./bezier";
+import Arc from "./arc";
 import LinearPosition from "./linear";
@@ -121,2 +122,14 @@
         functions.push(curve);
+      } else if(parsed[i][0] === "A"){
+        curve = new Arc(cur[0], cur[1], parsed[i][1], parsed[i][2], parsed[i][3], parsed[i][4], parsed[i][5], parsed[i][6], parsed[i][7]);
+
+        length = length + curve.getTotalLength();
+        cur = [parsed[i][6], parsed[i][7]];
+        functions.push(curve);
+      } else if(parsed[i][0] === "a"){
+        curve = new Arc(cur[0], cur[1], parsed[i][1], parsed[i][2], parsed[i][3], parsed[i][4], parsed[i][5], cur[0] + parsed[i][6], cur[1] + parsed[i][7]);
+
+        length = length + curve.getTotalLength();
+        cur = [cur[0] + parsed[i][6], cur[1] + parsed[i][7]];
+        functions.push(curve);
       }
@@ -123,0 +136,0 @@ partial_lengths.push(length);

New alerts

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License

This package is not allowed per your license policy. Review the package's license to ensure compliance.

Found 1 instance in 1 package

Fixed alerts

License Policy Violation

License

This package is not allowed per your license policy. Review the package's license to ensure compliance.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

128010

increased by17.09%

Number of package files

15

increased by15.38%

Lines of code

1574

increased by41.55%

No dependency changes