packages/miew/src/gfx/modes/groups/BondsCylinderGroup.js
import BondsGroup from './BondsGroup'
import { Vector3 } from 'three'
class BondsCylinderGroup extends BondsGroup {
_build() {
const bondsIdc = this._selection.chunks
const { bonds, parent } = this._selection
const mode = this._mode
const colorer = this._colorer
const geo = this._geo
const drawMultiple = mode.drawMultiorderBonds()
const showAromatic = mode.showAromaticLoops()
const stickRad = mode.calcStickRadius()
const emptyOffset = mode.calcSpaceFraction()
let normDir
const leftPos = new Vector3()
const rightPos = new Vector3()
let currBondIdx = 0
const chunksToIdx = []
for (let i = 0, n = bondsIdc.length; i < n; ++i) {
const bond = bonds[bondsIdc[i]]
const atom1 = bond._left
const atom2 = bond._right
const a1Pos = atom1.position
const a2Pos = atom2.position
normDir = bond.calcNormalDir()
const order = this.getBondOrder(bond, drawMultiple, showAromatic)
const minRad = Math.min(
mode.calcAtomRadius(atom1),
mode.calcAtomRadius(atom2)
)
const dist = (2 * minRad) / order
const currStickRad = drawMultiple
? Math.min(stickRad, dist * 0.5 * (1.0 - emptyOffset))
: stickRad
for (let j = 0; j < order; ++j) {
const scale =
dist *
(order % 2 === 0
? (((j / 2) | 0) + 0.5) * (1 - 2 * (j % 2))
: (((j + 1) / 2) | 0) * (-1 + 2 * (j % 2)))
chunksToIdx[currBondIdx] = bond._index
leftPos.copy(a1Pos)
leftPos.addScaledVector(normDir, scale)
rightPos.copy(a2Pos)
rightPos.addScaledVector(normDir, scale)
geo.setItem(currBondIdx, leftPos, rightPos, currStickRad)
geo.setColor(
currBondIdx++,
colorer.getAtomColor(atom1, parent),
colorer.getAtomColor(atom2, parent)
)
}
}
geo.finalize()
this._chunksIdc = chunksToIdx
}
updateToFrame(frameData) {
const bondsIdc = this._selection.chunks
const { bonds } = this._selection
const mode = this._mode
const colorer = this._colorer
const geo = this._geo
const drawMultiple = mode.drawMultiorderBonds()
const showAromatic = mode.showAromaticLoops()
const stickRad = mode.calcStickRadius()
const emptyOffset = mode.calcSpaceFraction()
let normDir
const leftPos = new Vector3()
const rightPos = new Vector3()
let currBondIdx = 0
const updateColor = frameData.needsColorUpdate(colorer)
for (let i = 0, n = bondsIdc.length; i < n; ++i) {
const bond = bonds[bondsIdc[i]]
const atom1 = bond._left
const atom2 = bond._right
const a1Pos = frameData.getAtomPos(atom1.index).clone()
const a2Pos = frameData.getAtomPos(atom2.index)
normDir = bond.calcNormalDir()
const order = this.getBondOrder(bond, drawMultiple, showAromatic)
const minRad = Math.min(
mode.calcAtomRadius(atom1),
mode.calcAtomRadius(atom2)
)
const dist = (2 * minRad) / order
const currStickRad = drawMultiple
? Math.min(stickRad, dist * 0.5 * (1.0 - emptyOffset))
: stickRad
for (let j = 0; j < order; ++j) {
const scale =
dist *
(order % 2 === 0
? (((j / 2) | 0) + 0.5) * (1 - 2 * (j % 2))
: (((j + 1) / 2) | 0) * (-1 + 2 * (j % 2)))
leftPos.copy(a1Pos)
leftPos.addScaledVector(normDir, scale)
rightPos.copy(a2Pos)
rightPos.addScaledVector(normDir, scale)
geo.setItem(currBondIdx, leftPos, rightPos, currStickRad)
if (updateColor) {
geo.setColor(
currBondIdx,
frameData.getAtomColor(colorer, atom1),
frameData.getAtomColor(colorer, atom2)
)
}
currBondIdx++
}
}
geo.finalize()
}
}
export default BondsCylinderGroup