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Powerful SVG-Editor for your browser

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/** * Path functionality. * @module path * @license MIT * * @copyright 2011 Alexis Deveria, 2011 Jeff Schiller */ import { shortFloat } from '../common/units.js'; import { transformPoint } from './math.js'; import { getRotationAngle, getBBox, getRefElem, findDefs, isNullish, getBBox as utilsGetBBox } from './utilities.js'; import { init as pathMethodInit, ptObjToArrMethod, getGripPtMethod, getPointFromGripMethod, addPointGripMethod, getGripContainerMethod, addCtrlGripMethod, getCtrlLineMethod, getPointGripMethod, getControlPointsMethod, replacePathSegMethod, getSegSelectorMethod, Path } from './path-method.js'; import { init as pathActionsInit, pathActionsMethod } from './path-actions.js'; const segData = { 2: [ 'x', 'y' ], // PATHSEG_MOVETO_ABS 4: [ 'x', 'y' ], // PATHSEG_LINETO_ABS 6: [ 'x', 'y', 'x1', 'y1', 'x2', 'y2' ], // PATHSEG_CURVETO_CUBIC_ABS 8: [ 'x', 'y', 'x1', 'y1' ], // PATHSEG_CURVETO_QUADRATIC_ABS 10: [ 'x', 'y', 'r1', 'r2', 'angle', 'largeArcFlag', 'sweepFlag' ], // PATHSEG_ARC_ABS 12: [ 'x' ], // PATHSEG_LINETO_HORIZONTAL_ABS 14: [ 'y' ], // PATHSEG_LINETO_VERTICAL_ABS 16: [ 'x', 'y', 'x2', 'y2' ], // PATHSEG_CURVETO_CUBIC_SMOOTH_ABS 18: [ 'x', 'y' ] // PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS }; /** * @tutorial LocaleDocs * @typedef {module:locale.LocaleStrings|PlainObject} module:path.uiStrings * @property {PlainObject<string, string>} ui */ const uiStrings = {}; /** * @function module:path.setUiStrings * @param {module:path.uiStrings} strs * @returns {void} */ export const setUiStrings = function (strs) { Object.assign(uiStrings, strs.ui); }; let pathFuncs = []; let linkControlPts = true; // Stores references to paths via IDs. // TODO: Make this cross-document happy. let pathData = {}; /** * @function module:path.setLinkControlPoints * @param {boolean} lcp * @returns {void} */ export const setLinkControlPoints = function (lcp) { linkControlPts = lcp; }; /** * @name module:path.path * @type {null|module:path.Path} * @memberof module:path */ export let path = null; let editorContext_ = null; /** * @external MouseEvent */ /** * Object with the following keys/values. * @typedef {PlainObject} module:path.SVGElementJSON * @property {string} element - Tag name of the SVG element to create * @property {PlainObject<string, string>} attr - Has key-value attributes to assign to the new element. * An `id` should be set so that {@link module:utilities.EditorContext#addSVGElementFromJson} can later re-identify the element for modification or replacement. * @property {boolean} [curStyles=false] - Indicates whether current style attributes should be applied first * @property {module:path.SVGElementJSON[]} [children] - Data objects to be added recursively as children * @property {string} [namespace="http://www.w3.org/2000/svg"] - Indicate a (non-SVG) namespace */ /** * @interface module:path.EditorContext * @property {module:select.SelectorManager} selectorManager * @property {module:svgcanvas.SvgCanvas} canvas */ /** * @function module:path.EditorContext#call * @param {"selected"|"changed"} ev - String with the event name * @param {module:svgcanvas.SvgCanvas#event:selected|module:svgcanvas.SvgCanvas#event:changed} arg - Argument to pass through to the callback function. * If the event is "changed", an array of `Element`s is passed; if "selected", a single-item array of `Element` is passed. * @returns {void} */ /** * Note: This doesn't round to an integer necessarily. * @function module:path.EditorContext#round * @param {Float} val * @returns {Float} Rounded value to nearest value based on `currentZoom` */ /** * @function module:path.EditorContext#clearSelection * @param {boolean} [noCall] - When `true`, does not call the "selected" handler * @returns {void} */ /** * @function module:path.EditorContext#addToSelection * @param {Element[]} elemsToAdd - An array of DOM elements to add to the selection * @param {boolean} showGrips - Indicates whether the resize grips should be shown * @returns {void} */ /** * @function module:path.EditorContext#addCommandToHistory * @param {Command} cmd * @returns {void} */ /** * @function module:path.EditorContext#remapElement * @param {Element} selected - DOM element to be changed * @param {PlainObject<string, string>} changes - Object with changes to be remapped * @param {SVGMatrix} m - Matrix object to use for remapping coordinates * @returns {void} */ /** * @function module:path.EditorContext#addSVGElementFromJson * @param {module:path.SVGElementJSON} data * @returns {Element} The new element */ /** * @function module:path.EditorContext#getGridSnapping * @returns {boolean} */ /** * @function module:path.EditorContext#getOpacity * @returns {Float} */ /** * @function module:path.EditorContext#getSelectedElements * @returns {Element[]} the array with selected DOM elements */ /** * @function module:path.EditorContext#getContainer * @returns {Element} */ /** * @function module:path.EditorContext#setStarted * @param {boolean} s * @returns {void} */ /** * @function module:path.EditorContext#getRubberBox * @returns {SVGRectElement} */ /** * @function module:path.EditorContext#setRubberBox * @param {SVGRectElement} rb * @returns {SVGRectElement} Same as parameter passed in */ /** * @function module:path.EditorContext#addPtsToSelection * @param {PlainObject} cfg * @param {boolean} cfg.closedSubpath * @param {SVGCircleElement[]} cfg.grips * @returns {void} */ /** * @function module:path.EditorContext#endChanges * @param {PlainObject} cfg * @param {string} cfg.cmd * @param {Element} cfg.elem * @returns {void} */ /** * @function module:path.EditorContext#getCurrentZoom * @returns {Float} The current zoom level */ /** * Returns the last created DOM element ID string. * @function module:path.EditorContext#getId * @returns {string} */ /** * Creates and returns a unique ID string for a DOM element. * @function module:path.EditorContext#getNextId * @returns {string} */ /** * Gets the desired element from a mouse event. * @function module:path.EditorContext#getMouseTarget * @param {external:MouseEvent} evt - Event object from the mouse event * @returns {Element} DOM element we want */ /** * @function module:path.EditorContext#getCurrentMode * @returns {string} */ /** * @function module:path.EditorContext#setCurrentMode * @param {string} cm The mode * @returns {string} The same mode as passed in */ /** * @function module:path.EditorContext#getDrawnPath * @returns {SVGPathElement|null} */ /** * @function module:path.EditorContext#setDrawnPath * @param {SVGPathElement|null} dp * @returns {SVGPathElement|null} The same value as passed in */ /** * @function module:path.EditorContext#getSVGRoot * @returns {SVGSVGElement} */ /** * @function module:path.init * @param {module:path.EditorContext} editorContext * @returns {void} */ export const init = function (editorContext) { editorContext_ = editorContext; pathFuncs = [ 0, 'ClosePath' ]; const pathFuncsStrs = [ 'Moveto', 'Lineto', 'CurvetoCubic', 'CurvetoQuadratic', 'Arc', 'LinetoHorizontal', 'LinetoVertical', 'CurvetoCubicSmooth', 'CurvetoQuadraticSmooth' ]; pathFuncsStrs.forEach(function(s){ pathFuncs.push(s + 'Abs'); pathFuncs.push(s + 'Rel'); }); }; pathMethodInit( /** * @implements {module:path-method.pathMethodsContext} */ { getEditorContext () { return editorContext_; }, getSegData () { return segData; }, getUIStrings () { return uiStrings; }, getPathObj () { return path; }, setPathObj (obj) { path = obj; }, getPathFuncs () { return pathFuncs; }, getLinkControlPts () { return linkControlPts; } } ); /* eslint-disable max-len */ /** * @function module:path.ptObjToArr * @todo See if this should just live in `replacePathSeg` * @param {string} type * @param {SVGPathSegMovetoAbs|SVGPathSegLinetoAbs|SVGPathSegCurvetoCubicAbs|SVGPathSegCurvetoQuadraticAbs|SVGPathSegArcAbs|SVGPathSegLinetoHorizontalAbs|SVGPathSegLinetoVerticalAbs|SVGPathSegCurvetoCubicSmoothAbs|SVGPathSegCurvetoQuadraticSmoothAbs} segItem * @returns {ArgumentsArray} */ /* eslint-enable max-len */ export const ptObjToArr = ptObjToArrMethod; /** * @function module:path.getGripPt * @param {Segment} seg * @param {module:math.XYObject} altPt * @returns {module:math.XYObject} */ export const getGripPt = getGripPtMethod; /** * @function module:path.getPointFromGrip * @param {module:math.XYObject} pt * @param {module:path.Path} pth * @returns {module:math.XYObject} */ export const getPointFromGrip = getPointFromGripMethod; /** * Requires prior call to `setUiStrings` if `xlink:title` * to be set on the grip. * @function module:path.addPointGrip * @param {Integer} index * @param {Integer} x * @param {Integer} y * @returns {SVGCircleElement} */ export const addPointGrip = addPointGripMethod; /** * @function module:path.getGripContainer * @returns {Element} */ export const getGripContainer = getGripContainerMethod; /** * Requires prior call to `setUiStrings` if `xlink:title` * to be set on the grip. * @function module:path.addCtrlGrip * @param {string} id * @returns {SVGCircleElement} */ export const addCtrlGrip = addCtrlGripMethod; /** * @function module:path.getCtrlLine * @param {string} id * @returns {SVGLineElement} */ export const getCtrlLine = getCtrlLineMethod; /** * @function module:path.getPointGrip * @param {Segment} seg * @param {boolean} update * @returns {SVGCircleElement} */ export const getPointGrip = getPointGripMethod; /** * @function module:path.getControlPoints * @param {Segment} seg * @returns {PlainObject<string, SVGLineElement|SVGCircleElement>} */ export const getControlPoints = getControlPointsMethod; /** * This replaces the segment at the given index. Type is given as number. * @function module:path.replacePathSeg * @param {Integer} type Possible values set during {@link module:path.init} * @param {Integer} index * @param {ArgumentsArray} pts * @param {SVGPathElement} elem * @returns {void} */ export const replacePathSeg = replacePathSegMethod; /** * @function module:path.getSegSelector * @param {Segment} seg * @param {boolean} update * @returns {SVGPathElement} */ export const getSegSelector = getSegSelectorMethod; /** * @typedef {PlainObject} Point * @property {Integer} x The x value * @property {Integer} y The y value */ /** * Takes three points and creates a smoother line based on them. * @function module:path.smoothControlPoints * @param {Point} ct1 - Object with x and y values (first control point) * @param {Point} ct2 - Object with x and y values (second control point) * @param {Point} pt - Object with x and y values (third point) * @returns {Point[]} Array of two "smoothed" point objects */ export const smoothControlPoints = function (ct1, ct2, pt) { // each point must not be the origin const x1 = ct1.x - pt.x; const y1 = ct1.y - pt.y; const x2 = ct2.x - pt.x; const y2 = ct2.y - pt.y; if ((x1 !== 0 || y1 !== 0) && (x2 !== 0 || y2 !== 0)) { const r1 = Math.sqrt(x1 * x1 + y1 * y1); const r2 = Math.sqrt(x2 * x2 + y2 * y2); const nct1 = editorContext_.getSVGRoot().createSVGPoint(); const nct2 = editorContext_.getSVGRoot().createSVGPoint(); let anglea = Math.atan2(y1, x1); let angleb = Math.atan2(y2, x2); if (anglea < 0) { anglea += 2 * Math.PI; } if (angleb < 0) { angleb += 2 * Math.PI; } const angleBetween = Math.abs(anglea - angleb); const angleDiff = Math.abs(Math.PI - angleBetween) / 2; let newAnglea; let newAngleb; if (anglea - angleb > 0) { newAnglea = angleBetween < Math.PI ? (anglea + angleDiff) : (anglea - angleDiff); newAngleb = angleBetween < Math.PI ? (angleb - angleDiff) : (angleb + angleDiff); } else { newAnglea = angleBetween < Math.PI ? (anglea - angleDiff) : (anglea + angleDiff); newAngleb = angleBetween < Math.PI ? (angleb + angleDiff) : (angleb - angleDiff); } // rotate the points nct1.x = r1 * Math.cos(newAnglea) + pt.x; nct1.y = r1 * Math.sin(newAnglea) + pt.y; nct2.x = r2 * Math.cos(newAngleb) + pt.x; nct2.y = r2 * Math.sin(newAngleb) + pt.y; return [ nct1, nct2 ]; } return undefined; }; /** * @function module:path.getPath_ * @param {SVGPathElement} elem * @returns {module:path.Path} */ export const getPath_ = function (elem) { let p = pathData[elem.id]; if (!p) { p = pathData[elem.id] = new Path(elem); } return p; }; /** * @function module:path.removePath_ * @param {string} id * @returns {void} */ export const removePath_ = function (id) { if (id in pathData) { delete pathData[id]; } }; let newcx; let newcy; let oldcx; let oldcy; let angle; const getRotVals = function (x, y) { let dx = x - oldcx; let dy = y - oldcy; // rotate the point around the old center let r = Math.sqrt(dx * dx + dy * dy); let theta = Math.atan2(dy, dx) + angle; dx = r * Math.cos(theta) + oldcx; dy = r * Math.sin(theta) + oldcy; // dx,dy should now hold the actual coordinates of each // point after being rotated // now we want to rotate them around the new center in the reverse direction dx -= newcx; dy -= newcy; r = Math.sqrt(dx * dx + dy * dy); theta = Math.atan2(dy, dx) - angle; return { x: r * Math.cos(theta) + newcx, y: r * Math.sin(theta) + newcy }; }; // If the path was rotated, we must now pay the piper: // Every path point must be rotated into the rotated coordinate system of // its old center, then determine the new center, then rotate it back // This is because we want the path to remember its rotation /** * @function module:path.recalcRotatedPath * @todo This is still using ye olde transform methods, can probably * be optimized or even taken care of by `recalculateDimensions` * @returns {void} */ export const recalcRotatedPath = function () { const currentPath = path.elem; angle = getRotationAngle(currentPath, true); if (!angle) { return; } // selectedBBoxes[0] = path.oldbbox; const oldbox = path.oldbbox; // selectedBBoxes[0], oldcx = oldbox.x + oldbox.width / 2; oldcy = oldbox.y + oldbox.height / 2; const box = getBBox(currentPath); newcx = box.x + box.width / 2; newcy = box.y + box.height / 2; // un-rotate the new center to the proper position const dx = newcx - oldcx; const dy = newcy - oldcy; const r = Math.sqrt(dx * dx + dy * dy); const theta = Math.atan2(dy, dx) + angle; newcx = r * Math.cos(theta) + oldcx; newcy = r * Math.sin(theta) + oldcy; const list = currentPath.pathSegList; let i = list.numberOfItems; while (i) { i -= 1; const seg = list.getItem(i); const type = seg.pathSegType; if (type === 1) { continue; } const rvals = getRotVals(seg.x, seg.y); const points = [ rvals.x, rvals.y ]; if (!isNullish(seg.x1) && !isNullish(seg.x2)) { const cVals1 = getRotVals(seg.x1, seg.y1); const cVals2 = getRotVals(seg.x2, seg.y2); points.splice(points.length, 0, cVals1.x, cVals1.y, cVals2.x, cVals2.y); } replacePathSeg(type, i, points); } // loop for each point /* box = */ getBBox(currentPath); // selectedBBoxes[0].x = box.x; selectedBBoxes[0].y = box.y; // selectedBBoxes[0].width = box.width; selectedBBoxes[0].height = box.height; // now we must set the new transform to be rotated around the new center const Rnc = editorContext_.getSVGRoot().createSVGTransform(); const tlist = currentPath.transform.baseVal; Rnc.setRotate((angle * 180.0 / Math.PI), newcx, newcy); tlist.replaceItem(Rnc, 0); }; // ==================================== // Public API starts here /** * @function module:path.clearData * @returns {void} */ export const clearData = function () { pathData = {}; }; // Making public for mocking /** * @function module:path.reorientGrads * @param {Element} elem * @param {SVGMatrix} m * @returns {void} */ export const reorientGrads = function (elem, m) { const bb = utilsGetBBox(elem); for (let i = 0; i < 2; i++) { const type = i === 0 ? 'fill' : 'stroke'; const attrVal = elem.getAttribute(type); if (attrVal && attrVal.startsWith('url(')) { const grad = getRefElem(attrVal); if (grad.tagName === 'linearGradient') { let x1 = grad.getAttribute('x1') || 0; let y1 = grad.getAttribute('y1') || 0; let x2 = grad.getAttribute('x2') || 1; let y2 = grad.getAttribute('y2') || 0; // Convert to USOU points x1 = (bb.width * x1) + bb.x; y1 = (bb.height * y1) + bb.y; x2 = (bb.width * x2) + bb.x; y2 = (bb.height * y2) + bb.y; // Transform those points const pt1 = transformPoint(x1, y1, m); const pt2 = transformPoint(x2, y2, m); // Convert back to BB points const gCoords = { x1: (pt1.x - bb.x) / bb.width, y1: (pt1.y - bb.y) / bb.height, x2: (pt2.x - bb.x) / bb.width, y2: (pt2.y - bb.y) / bb.height }; const newgrad = grad.cloneNode(true); for (const [ key, value ] of Object.entries(gCoords)) { newgrad.setAttribute(key, value); } newgrad.id = editorContext_.getNextId(); findDefs().append(newgrad); elem.setAttribute(type, 'url(#' + newgrad.id + ')'); } } } }; /** * This is how we map paths to our preferred relative segment types. * @name module:path.pathMap * @type {GenericArray} */ const pathMap = [ 0, 'z', 'M', 'm', 'L', 'l', 'C', 'c', 'Q', 'q', 'A', 'a', 'H', 'h', 'V', 'v', 'S', 's', 'T', 't' ]; /** * Convert a path to one with only absolute or relative values. * @todo move to pathActions.js * @function module:path.convertPath * @param {SVGPathElement} pth - the path to convert * @param {boolean} toRel - true of convert to relative * @returns {string} */ export const convertPath = function (pth, toRel) { const { pathSegList } = pth; const len = pathSegList.numberOfItems; let curx = 0; let cury = 0; let d = ''; let lastM = null; for (let i = 0; i < len; ++i) { const seg = pathSegList.getItem(i); // if these properties are not in the segment, set them to zero let x = seg.x || 0; let y = seg.y || 0; let x1 = seg.x1 || 0; let y1 = seg.y1 || 0; let x2 = seg.x2 || 0; let y2 = seg.y2 || 0; const type = seg.pathSegType; let letter = pathMap[type][toRel ? 'toLowerCase' : 'toUpperCase'](); switch (type) { case 1: // z,Z closepath (Z/z) d += 'z'; if (lastM && !toRel) { curx = lastM[0]; cury = lastM[1]; } break; case 12: // absolute horizontal line (H) x -= curx; // Fallthrough case 13: // relative horizontal line (h) if (toRel) { y = 0; curx += x; letter = 'l'; } else { y = cury; x += curx; curx = x; letter = 'L'; } // Convert to "line" for easier editing d += pathDSegment(letter, [ [ x, y ] ]); break; case 14: // absolute vertical line (V) y -= cury; // Fallthrough case 15: // relative vertical line (v) if (toRel) { x = 0; cury += y; letter = 'l'; } else { x = curx; y += cury; cury = y; letter = 'L'; } // Convert to "line" for easier editing d += pathDSegment(letter, [ [ x, y ] ]); break; case 2: // absolute move (M) case 4: // absolute line (L) case 18: // absolute smooth quad (T) case 10: // absolute elliptical arc (A) x -= curx; y -= cury; // Fallthrough case 5: // relative line (l) case 3: // relative move (m) case 19: // relative smooth quad (t) if (toRel) { curx += x; cury += y; } else { x += curx; y += cury; curx = x; cury = y; } if (type === 2 || type === 3) { lastM = [ curx, cury ]; } d += pathDSegment(letter, [ [ x, y ] ]); break; case 6: // absolute cubic (C) x -= curx; x1 -= curx; x2 -= curx; y -= cury; y1 -= cury; y2 -= cury; // Fallthrough case 7: // relative cubic (c) if (toRel) { curx += x; cury += y; } else { x += curx; x1 += curx; x2 += curx; y += cury; y1 += cury; y2 += cury; curx = x; cury = y; } d += pathDSegment(letter, [ [ x1, y1 ], [ x2, y2 ], [ x, y ] ]); break; case 8: // absolute quad (Q) x -= curx; x1 -= curx; y -= cury; y1 -= cury; // Fallthrough case 9: // relative quad (q) if (toRel) { curx += x; cury += y; } else { x += curx; x1 += curx; y += cury; y1 += cury; curx = x; cury = y; } d += pathDSegment(letter, [ [ x1, y1 ], [ x, y ] ]); break; // Fallthrough case 11: // relative elliptical arc (a) if (toRel) { curx += x; cury += y; } else { x += curx; y += cury; curx = x; cury = y; } d += pathDSegment(letter, [ [ seg.r1, seg.r2 ] ], [ seg.angle, (seg.largeArcFlag ? 1 : 0), (seg.sweepFlag ? 1 : 0) ], [ x, y ]); break; case 16: // absolute smooth cubic (S) x -= curx; x2 -= curx; y -= cury; y2 -= cury; // Fallthrough case 17: // relative smooth cubic (s) if (toRel) { curx += x; cury += y; } else { x += curx; x2 += curx; y += cury; y2 += cury; curx = x; cury = y; } d += pathDSegment(letter, [ [ x2, y2 ], [ x, y ] ]); break; } // switch on path segment type } // for each segment return d; }; /** * TODO: refactor callers in `convertPath` to use `getPathDFromSegments` instead of this function. * Legacy code refactored from `svgcanvas.pathActions.convertPath`. * @param {string} letter - path segment command (letter in potentially either case from {@link module:path.pathMap}; see [SVGPathSeg#pathSegTypeAsLetter]{@link https://www.w3.org/TR/SVG/single-page.html#paths-__svg__SVGPathSeg__pathSegTypeAsLetter}) * @param {GenericArray<GenericArray<Integer>>} points - x,y points * @param {GenericArray<GenericArray<Integer>>} [morePoints] - x,y points * @param {Integer[]} [lastPoint] - x,y point * @returns {string} */ function pathDSegment (letter, points, morePoints, lastPoint) { points.forEach(function(pnt, i){ points[i] = shortFloat(pnt); }); let segment = letter + points.join(' '); if (morePoints) { segment += ' ' + morePoints.join(' '); } if (lastPoint) { segment += ' ' + shortFloat(lastPoint); } return segment; } pathActionsInit( /** * @implements {module:path-actions.pathActionsContext} */ { getEditorContext () { return editorContext_; }, getPathMap () { return pathMap; }, smoothControlPoints, addPointGrip, recalcRotatedPath, removePath_, addCtrlGrip, getCtrlLine, replacePathSeg, getPointFromGrip, getGripPt, getPath_, reorientGrads, setLinkControlPoints } ); /** * Group: Path edit functions. * Functions relating to editing path elements. */ export const pathActions = pathActionsMethod; // end pathActions