#1939: revert render refactoring

packages/ketcher-core/src/application/render/raphaelRender.js

@@ -0,0 +1,252 @@
+/****************************************************************************
+ * Copyright 2021 EPAM Systems
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ***************************************************************************/
+
+import { Box2Abs, Struct, Vec2 } from 'domain/entities'
+
+import Raphael from './raphael-ext'
+import { ReStruct } from './restruct'
+import { Scale } from 'domain/helpers'
+import defaultOptions from './options'
+import draw from './draw'
+
+export function Render(clientArea, opt) {
+  let renderWidth = opt.width || clientArea.clientWidth - 10
+  let renderHeight = opt.height || clientArea.clientHeight - 10
+  renderWidth = renderWidth > 0 ? renderWidth : 0
+  renderHeight = renderHeight > 0 ? renderHeight : 0
+
+  this.userOpts = opt
+  this.clientArea = clientArea
+  this.paper = new Raphael(clientArea, renderWidth, renderHeight)
+  this.sz = Vec2.ZERO
+  this.ctab = new ReStruct(new Struct(), this)
+  this.options = defaultOptions(this.userOpts)
+}
+
+Render.prototype.updateOptions = function (opts) {
+  try {
+    const passedOptions = JSON.parse(opts)
+    if (passedOptions && typeof passedOptions === 'object') {
+      this.options = { ...this.options, ...passedOptions }
+      return this.options
+    }
+  } catch (e) {
+    console.log('Not a valid settings object')
+  }
+  return false
+}
+
+Render.prototype.selectionPolygon = function (r) {
+  return draw.selectionPolygon(this.paper, r, this.options)
+}
+
+Render.prototype.selectionLine = function (p0, p1) {
+  return draw.selectionLine(this.paper, p0, p1, this.options)
+}
+
+Render.prototype.selectionRectangle = function (p0, p1) {
+  return draw.selectionRectangle(this.paper, p0, p1, this.options)
+}
+
+Render.prototype.view2obj = function (p, isRelative) {
+  let scroll = this.scrollPos()
+  if (!this.useOldZoom) {
+    p = p.scaled(1 / this.options.zoom)
+    scroll = scroll.scaled(1 / this.options.zoom)
+  }
+  p = isRelative ? p : p.add(scroll).sub(this.options.offset)
+  return Scale.scaled2obj(p, this.options)
+}
+
+Render.prototype.obj2view = function (v, isRelative) {
+  let p = Scale.obj2scaled(v, this.options)
+  p = isRelative
+    ? p
+    : p
+        .add(this.options.offset)
+        .sub(this.scrollPos().scaled(1 / this.options.zoom))
+  if (!this.useOldZoom) p = p.scaled(this.options.zoom)
+  return p
+}
+
+Render.prototype.scrollPos = function () {
+  return new Vec2(this.clientArea.scrollLeft, this.clientArea.scrollTop)
+}
+
+Render.prototype.page2obj = function (event) {
+  const clientArea = this.clientArea
+
+  const { top: offsetTop, left: offsetLeft } =
+    clientArea.getBoundingClientRect()
+
+  const pp = new Vec2(event.clientX - offsetLeft, event.clientY - offsetTop)
+  return this.view2obj(pp)
+}
+
+Render.prototype.setPaperSize = function (sz) {
+  this.sz = sz
+  this.paper.setSize(sz.x * this.options.zoom, sz.y * this.options.zoom)
+  this.setViewBox(this.options.zoom)
+}
+
+Render.prototype.setOffset = function (newoffset) {
+  const delta = new Vec2(
+    newoffset.x - this.options.offset.x,
+    newoffset.y - this.options.offset.y
+  )
+  this.clientArea.scrollLeft += delta.x
+  this.clientArea.scrollTop += delta.y
+  this.options.offset = newoffset
+}
+
+Render.prototype.setZoom = function (zoom) {
+  // when scaling the canvas down it may happen that the scaled canvas is smaller than the view window
+  // don't forget to call setScrollOffset after zooming (or use extendCanvas directly)
+  this.options.zoom = zoom
+  this.paper.setSize(this.sz.x * zoom, this.sz.y * zoom)
+  this.setViewBox(zoom)
+}
+
+function calcExtend(sSz, x0, y0, x1, y1) {
+  // eslint-disable-line max-params
+  let ex = x0 < 0 ? -x0 : 0
+  let ey = y0 < 0 ? -y0 : 0
+
+  if (sSz.x < x1) ex += x1 - sSz.x
+  if (sSz.y < y1) ey += y1 - sSz.y
+  return new Vec2(ex, ey)
+}
+
+Render.prototype.setScrollOffset = function (x, y) {
+  const clientArea = this.clientArea
+  const cx = clientArea.clientWidth
+  const cy = clientArea.clientHeight
+  const e = calcExtend(
+    this.sz.scaled(this.options.zoom),
+    x,
+    y,
+    cx + x,
+    cy + y
+  ).scaled(1 / this.options.zoom)
+  if (e.x > 0 || e.y > 0) {
+    this.setPaperSize(this.sz.add(e))
+    const d = new Vec2(x < 0 ? -x : 0, y < 0 ? -y : 0).scaled(
+      1 / this.options.zoom
+    )
+    if (d.x > 0 || d.y > 0) {
+      this.ctab.translate(d)
+      this.setOffset(this.options.offset.add(d))
+    }
+  }
+  // clientArea.scrollLeft = x
+  // clientArea.scrollTop = y
+  clientArea.scrollLeft = x * this.options.scale
+  clientArea.scrollTop = y * this.options.scale
+  // TODO: store drag position in scaled systems
+  // scrollLeft = clientArea.scrollLeft;
+  // scrollTop = clientArea.scrollTop;
+  this.update(false)
+}
+
+Render.prototype.setScale = function (z) {
+  if (this.options.offset) {
+    this.options.offset = this.options.offset.scaled(1 / z).scaled(z)
+  }
+  this.userOpts.scale *= z
+  this.options = null
+  this.update(true)
+}
+
+Render.prototype.setViewBox = function (z) {
+  if (!this.useOldZoom) {
+    this.paper.canvas.setAttribute(
+      'viewBox',
+      '0 0 ' + this.sz.x + ' ' + this.sz.y
+    )
+  } else this.setScale(z)
+}
+
+Render.prototype.setMolecule = function (ctab) {
+  this.paper.clear()
+  this.ctab = new ReStruct(ctab, this)
+  this.options.offset = new Vec2()
+  this.update(false)
+}
+
+Render.prototype.update = function (force = false, viewSz = null) {
+  // eslint-disable-line max-statements
+  viewSz =
+    viewSz ||
+    new Vec2(
+      this.clientArea.clientWidth || 100,
+      this.clientArea.clientHeight || 100
+    )
+
+  const changes = this.ctab.update(force)
+  this.ctab.setSelection() // [MK] redraw the selection bits where necessary
+  if (changes) {
+    const sf = this.options.scale
+    const bb = this.ctab
+      .getVBoxObj()
+      .transform(Scale.obj2scaled, this.options)
+      .translate(this.options.offset || new Vec2())
+
+    if (!this.options.autoScale) {
+      const ext = Vec2.UNIT.scaled(sf)
+      const eb = bb.sz().length() > 0 ? bb.extend(ext, ext) : bb
+      const vb = new Box2Abs(
+        this.scrollPos(),
+        viewSz.scaled(1 / this.options.zoom).sub(Vec2.UNIT.scaled(20))
+      )
+      const cb = Box2Abs.union(vb, eb)
+      if (!this.oldCb) this.oldCb = new Box2Abs()
+
+      const sz = cb.sz().floor()
+      const delta = this.oldCb.p0.sub(cb.p0).ceil()
+      this.oldBb = bb
+      if (!this.sz || sz.x !== this.sz.x || sz.y !== this.sz.y) {
+        this.setPaperSize(sz)
+      }
+
+      this.options.offset = this.options.offset || new Vec2()
+      if (delta.x !== 0 || delta.y !== 0) {
+        this.setOffset(this.options.offset.add(delta))
+        this.ctab.translate(delta)
+      }
+    } else {
+      const sz1 = bb.sz()
+      const marg = this.options.autoScaleMargin
+      const mv = new Vec2(marg, marg)
+      const csz = viewSz
+      if (marg && (csz.x < 2 * marg + 1 || csz.y < 2 * marg + 1)) {
+        throw new Error('View box too small for the given margin')
+      }
+      let rescale =
+        this.options.rescaleAmount ||
+        Math.max(sz1.x / (csz.x - 2 * marg), sz1.y / (csz.y - 2 * marg))
+      if (this.options.maxBondLength / rescale > 1.0) rescale = 1.0
+      const sz2 = sz1.add(mv.scaled(2 * rescale))
+      /* eslint-disable no-mixed-operators */
+      this.paper.setViewBox(
+        bb.pos().x - marg * rescale - (csz.x * rescale - sz2.x) / 2,
+        bb.pos().y - marg * rescale - (csz.y * rescale - sz2.y) / 2,
+        csz.x * rescale,
+        csz.y * rescale
+      )
+      /* eslint-enable no-mixed-operators */
+    }
+  }
+}