all files / lib/features/bendpoints/ BendpointUtil.js

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import {
  toPoint
} from '../../util/Event';
 
import {
  getMidPoint,
  pointsAligned
} from '../../util/Geometry';
 
import {
  append as svgAppend,
  attr as svgAttr,
  classes as svgClasses,
  create as svgCreate
} from 'tiny-svg';
 
import {
  rotate,
  translate
} from '../../util/SvgTransformUtil';
 
 
export var BENDPOINT_CLS = 'djs-bendpoint';
export var SEGMENT_DRAGGER_CLS = 'djs-segment-dragger';
 
export function toCanvasCoordinates(canvas, event) {
 
  var position = toPoint(event),
      clientRect = canvas._container.getBoundingClientRect(),
      offset;
 
  // canvas relative position
 
  offset = {
    x: clientRect.left,
    y: clientRect.top
  };
 
  // update actual event payload with canvas relative measures
 
  var viewbox = canvas.viewbox();
 
  return {
    x: viewbox.x + (position.x - offset.x) / viewbox.scale,
    y: viewbox.y + (position.y - offset.y) / viewbox.scale
  };
}
 
export function addBendpoint(parentGfx, cls) {
  var groupGfx = svgCreate('g');
  svgClasses(groupGfx).add(BENDPOINT_CLS);
 
  svgAppend(parentGfx, groupGfx);
 
  var visual = svgCreate('circle');
  svgAttr(visual, {
    cx: 0,
    cy: 0,
    r: 4
  });
  svgClasses(visual).add('djs-visual');
 
  svgAppend(groupGfx, visual);
 
  var hit = svgCreate('circle');
  svgAttr(hit, {
    cx: 0,
    cy: 0,
    r: 10
  });
  svgClasses(hit).add('djs-hit');
 
  svgAppend(groupGfx, hit);
 
  if (cls) {
    svgClasses(groupGfx).add(cls);
  }
 
  return groupGfx;
}
 
function createParallelDragger(parentGfx, position, alignment) {
  var draggerGfx = svgCreate('g');
 
  svgAppend(parentGfx, draggerGfx);
 
  var width = 14,
      height = 3,
      padding = 6,
      hitWidth = width + padding,
      hitHeight = height + padding;
 
  var visual = svgCreate('rect');
  svgAttr(visual, {
    x: -width / 2,
    y: -height / 2,
    width: width,
    height: height
  });
  svgClasses(visual).add('djs-visual');
 
  svgAppend(draggerGfx, visual);
 
  var hit = svgCreate('rect');
  svgAttr(hit, {
    x: -hitWidth / 2,
    y: -hitHeight / 2,
    width: hitWidth,
    height: hitHeight
  });
  svgClasses(hit).add('djs-hit');
 
  svgAppend(draggerGfx, hit);
 
  rotate(draggerGfx, alignment === 'h' ? 90 : 0, 0, 0);
 
  return draggerGfx;
}
 
 
export function addSegmentDragger(parentGfx, segmentStart, segmentEnd) {
 
  var groupGfx = svgCreate('g'),
      mid = getMidPoint(segmentStart, segmentEnd),
      alignment = pointsAligned(segmentStart, segmentEnd);
 
  svgAppend(parentGfx, groupGfx);
 
  createParallelDragger(groupGfx, mid, alignment);
 
  svgClasses(groupGfx).add(SEGMENT_DRAGGER_CLS);
  svgClasses(groupGfx).add(alignment === 'h' ? 'vertical' : 'horizontal');
 
  translate(groupGfx, mid.x, mid.y);
 
  return groupGfx;
}