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![](https://lively-kernel.org/lively4/lively4-core/demos/lively-simulation/screenshots/simulation.png){width=500px}\nMD*/\n\n\"enable aexpr\";\n\nimport Morph from 'src/components/widgets/lively-morph.js';\nimport Engine from 'demos/lively-simulation/engine.js';\nimport History from 'demos/lively-simulation/history.js';\nimport _ from 'src/external/lodash/lodash.js';\n\nconst EMPTY_PLACEHOLDER = 'EMPTY';\nconst RESERVED_CELL_NAMES = ['simulation'];\n\nexport default class LivelySimulation extends Morph {\n \n // life cycle\n initialize() {\n this.windowTitle = 'Simulation';\n lively.html.registerKeys(this);\n this.initializeEngine();\n this.initializeController();\n this.initializeContainerRoot();\n }\n \n initializeEngine() {\n const velocity = _.has(this.dataset, 'velocity') ? parseInt(this.dataset['velocity']) : undefined;\n const stopOnError = this.dataset['stoponerror'] || undefined;\n const time = _.has(this.dataset, 'time') ? parseInt(this.dataset['time']) : undefined;\n const dt = _.has(this.dataset, 'dt') ? parseFloat(this.dataset['dt']) : undefined;\n this.engine = new Engine(velocity, () => this.collectCells(), stopOnError, time, dt);\n }\n \n initializeController() {\n const { engine } = this;\n const controller = this.get('#controller');\n controller.initializeEngine(engine);\n const hideController = !!this.hasAttribute('data-hide-controller');\n if (hideController) controller.style.display = 'none';\n }\n \n initializeContainerRoot() {\n const { parentElement } = this;\n if (parentElement.id === 'container-root') {\n parentElement.style.width = '100%';\n parentElement.style.height = '100%';\n }\n }\n \n initializeHistory() {\n this.history = new History(() => this.getInnerHTML());\n }\n \n attachedCallback() {\n this.initializeHistory();\n }\n \n detachedCallback() {\n const { engine, history } = this;\n engine.stop();\n history.shutdown();\n }\n \n livelyPrepareSave() {\n const { engine: { stopOnError, time, timeDeltaPerStepInSeconds, velocity } } = this;\n this.dataset['velocity'] = velocity;\n this.dataset['stoponerror'] = stopOnError;\n this.dataset['time'] = time;\n this.dataset['dt'] = timeDeltaPerStepInSeconds;\n }\n \n livelyAcceptsDrop() { return true; }\n \n // event listener\n onKeyDown(event) {\n const { engine } = this;\n if(this.isCellFocusActive() || this.get('#controller').isFocused()) return;\n let matched = true;\n switch (event.key) {\n case ' ':\n engine.toggleStartStop();\n break;\n case '+':\n engine.increaseVelocity();\n break;\n case '-':\n engine.decreaseVelocity();\n break;\n case 's':\n engine.step();\n break;\n case 'r':\n this.reset();\n break;\n case 'a':\n this.addCell();\n break;\n default:\n matched = false;\n }\n if (matched) event.preventDefault();\n }\n \n // other\n get(selector) {\n const { shadowRoot } = this;\n return shadowRoot.querySelector(selector);\n }\n \n collectCells() {\n return [...this.querySelectorAll('lively-simulation-cell')];\n }\n \n addCell(event) {\n return Promise\n .resolve()\n .then(cell => {\n this.appendChild(cell);\n cell.setName(this.ensureUniqueCellName(cell.getName()));\n if (!event) return;\n cell.startGrabbing(event);\n });\n }\n \n ensureUniqueCellName(cellNameProposal, counterSlug = 1) {\n const cellNameProposalWithSlug = \n counterSlug > 1 ? `${cellNameProposal} (${counterSlug})` : cellNameProposal;\n const cellNames = _.concat(\n _.map(_.reject(this.collectCells(), cell => cell.isMirrorCell()), cell => this.toAlphaNumeric(cell.getName().toLowerCase())), \n RESERVED_CELL_NAMES\n );\n const sameNameCount = _.filter(cellNames, name => name === this.toAlphaNumeric(cellNameProposalWithSlug.toLowerCase())).length;\n if (sameNameCount - (counterSlug === 1) <= 0) return cellNameProposalWithSlug;\n return this.ensureUniqueCellName(cellNameProposal, counterSlug + 1);\n }\n \n toAlphaNumeric(str) {\n return str.replace(/\\W/g, '');\n }\n \n revert(snapshot) {\n this.innerHTML = snapshot === EMPTY_PLACEHOLDER ? '' : snapshot;\n }\n \n isCellFocusActive() {\n const cells = this.collectCells();\n return _.some(cells, cell => cell.isFocused());\n }\n \n cloneCell(event, cell) {\n cell.livelyPrepareSave();\n const clone = cell.cloneNode();\n this.appendChild(clone);\n setTimeout(() => {\n clone.setName(this.ensureUniqueCellName(clone.getName()));\n clone.startGrabbing(event);\n }, 0);\n }\n \n mirrorCell(event, cell) {\n cell.setAttribute('data-is-mirror', true);\n cell.livelyPrepareSave();\n const clone = cell.cloneNode();\n this.appendChild(clone);\n setTimeout(() => {\n clone.startGrabbing(event);\n cell.removeAttribute('data-is-mirror');\n cell.livelyPrepareSave();\n }, 0);\n }\n \n executeSingleCell(cell) {\n const { engine } = this;\n return engine.step([ cell ]);\n }\n \n reset() {\n const { engine } = this;\n engine.setTime(0);\n _.forEach(this.collectCells(), cell => cell.clearLog());\n }\n \n getInnerHTML() {\n const { innerHTML } = this;\n return innerHTML.length ? innerHTML : EMPTY_PLACEHOLDER;\n }\n \n getForegroundCell() {\n return _.maxBy(this.collectCells(), cell => parseInt(cell.style.zIndex || 1));\n }\n \n getEngine() {\n const { engine } = this;\n return engine;\n }\n \n getHistory() {\n const { history } = this;\n return history.get();\n }\n \n toggleHighlight(cellRef) {\n const { currentHighlight } = this;\n this.currentHighlight = (currentHighlight === cellRef) ? undefined : cellRef;\n const cells = this.collectCells();\n _.forEach(cells, cell => cell.highlight(this.currentHighlight));\n \n }\n \n removeMirrorCells(name) {\n const cells = this.collectCells();\n const mirrorCells = _.filter(cells, cell => cell.isMirrorCell() && _.isEqual(cell.getName(), name));\n _.forEach(mirrorCells, mirrorCell => mirrorCell.delete());\n }\n \n// livelyExample() {\n// this.innerHTML = `\n// \n//
Click here to see all cell that require fuel
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 max * dt\n// && (#Battery.energy < 0.9 * #Battery.max )) {\n// var gas = max * dt;\n// #Fuel.gas -= gas;\n// heat += 1.0 * gas\n// }\n// var delta = heat / factor * dt;\n// if (heat > 2) {\n// heat -= delta;\n// if(#HeatStorage.energy < #HeatStorage.max) {\n// #HeatStorage.energy += 0.5 * delta;\n// }\n// if (#Battery.energy < #Battery.max ) {\n// #Battery.energy += 0.4 * delta;\n// }\n// }\" data-view=\"codeView\" data-loginterval=\"1\" data-lively-id=\"c6eae5ef-cdc4-46df-9258-c0db109f88b8\"> max * dt &&\n// #HeatStorage.energy < 0.3 * #HeatStorage.max) {\n// var gas = max * dt;\n// #Fuel.gas -= gas;\n// heat += gas;\n// }\n\n// var delta = (heat / factor) * dt;\n// if (heat > 2 * max && #HeatStorage.energy < #HeatStorage.max ) {\n// heat -= delta;\n// #HeatStorage.energy += 0.8 * delta;\n// } else {\n// heat -= 0.2 * delta;\n// }\" data-view=\"codeView\" data-loginterval=\"1\" data-lively-id=\"80937f3f-2786-45de-8691-c83825696023\">\n//
A heating system requires fuel and produces heat
\n// delta) {\n// #HeatStorage.energy -= delta\n// consumed += delta\n// // TODO consume Extra\n// } else {\n// extra += delta\n// throw Error("RoomToCold")\n// }\n// \" data-view=\"codeView\" data-loginterval=\"1\" data-lively-id=\"8c62075a-2da9-4c8a-b389-2db5668abc39\"> delta) {\n// #Battery.energy -= delta\n// consumed += delta\n// } else {\n// extra += delta\n// throw Error("EngeryToLow")\n// }\n// \" data-view=\"codeView\" data-loginterval=\"1\" data-lively-id=\"5ee77098-fadb-4e95-9dea-1870e9af548a\">\n// `;\n// this.engine.setVelocity(10);\n// this.engine.stopOnError = false;\n// this.engine.setTimeDeltaPerStepInSeconds(0.1);\n// }\n}"]}