{ "schemaVersion": 1, "slug": "wallpaper-calculator", "category": "construction", "kind": "implementation", "independentValidation": false, "implementationHash": "aa0f37dee6c7e311c187cbd8b314dfdd89f7f9c35f938bd45ee336fe9136db02", "provenance": "Generated from the calculation contract used by the published page. Publication is not external validation.", "sourceFiles": [ "data/calculators/wallpaper-calculator.json", "src/engine.js" ], "runtimeSource": "/sources/engine.txt", "runtimeHash": "5c888d8898afbdee36267bb9977829e1e2ac568f6677c8ee87469c139864645c", "scope": "The compute function records implemented equations, constants, lookup tables and custom rules. Inputs record defaults and allowed values; outputs record precision and units. Defaults are examples, not recommendations. General background references are not evidence for this specific algorithm.", "publishedFormula": { "formula": "drop length = repeat × ceil((height + trim)/repeat); cuts/roll = floor(roll length/drop length); rolls = ceil(ceil(drops × (1 + waste/100))/cuts per roll); area mode = ceil(net area × (1 + waste/100)/coverage)", "vars": [], "note": "A roll too short for one drop is invalid. Area mode is explicitly a coverage estimate and does not simulate pattern matching; the old arbitrary repeat penalty is removed." }, "externalEvidence": null, "contract": { "compute": "try{if((([\"wall\"].includes(String(wallMode)))&&(!Number.isFinite(wallWidth)||wallWidth<0.01||wallWidth>5000))||((true)&&(!Number.isFinite(wallHeight)||wallHeight<1||wallHeight>40))||(([\"drops\"].includes(String(calculationMode)))&&(!Number.isFinite(rollLength)||rollLength<0.01||rollLength>1000))||(([\"drops\"].includes(String(calculationMode)))&&(!Number.isFinite(rollWidth)||rollWidth<0.01||rollWidth>20))||(([\"drops\"].includes(String(calculationMode)))&&(!Number.isFinite(patternRepeat)||patternRepeat<0||patternRepeat>120))||((true)&&(!Number.isFinite(deductions)||deductions<0||deductions>5000))||((true)&&(!Number.isFinite(wastePct)||wastePct<0||wastePct>100))||(([\"room\"].includes(String(wallMode)))&&(!Number.isFinite(length)||length<0.01||length>1000))||(([\"room\"].includes(String(wallMode)))&&(!Number.isFinite(width)||width<0.01||width>1000))||(([\"drops\"].includes(String(calculationMode)))&&(!Number.isFinite(trimIn)||trimIn<0||trimIn>120))||(([\"area\"].includes(String(calculationMode)))&&(!Number.isFinite(coverage)||coverage<0.01||coverage>10000)))throw new Error('inputError');const calculate=function(){const h=(function context() {\n const DAY=86400000;\n const own=(o,k)=>Object.prototype.hasOwnProperty.call(o,k);\n const fail=()=>{throw new Error('inputError');};\n const num=(v,min=-Infinity,max=Infinity,integer=false)=>{\n if(!Number.isFinite(v)||vmax||(integer&&!Number.isInteger(v)))fail();return v;\n };\n const choice=(v,values)=>{if(!values.includes(v))fail();return v;};\n const date=s=>{if(typeof s!=='string'||!/^\\d{4}-\\d{2}-\\d{2}$/.test(s)||s.startsWith('0000'))fail();const d=new Date(s+'T00:00:00Z');if(!Number.isFinite(+d)||d.toISOString().slice(0,10)!==s)fail();return d;};\n const iso=d=>{if(!Number.isFinite(+d)||d.getUTCFullYear()<1||d.getUTCFullYear()>9999)fail();return d.toISOString().slice(0,10);};\n const shift=(d,n)=>{const r=new Date(+d+n*DAY);iso(r);return r;};\n const month=(d,n)=>{const r=new Date(+d);r.setUTCDate(1);r.setUTCMonth(r.getUTCMonth()+n);const end=new Date(+r);end.setUTCMonth(end.getUTCMonth()+1,0);r.setUTCDate(Math.min(d.getUTCDate(),end.getUTCDate()));iso(r);return r;};\n const weekdays=['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];\n const work=(d,count)=>{let n=Math.floor(count/7)*5;for(let k=0;k{let n=(b.getUTCFullYear()-a.getUTCFullYear())*12+b.getUTCMonth()-a.getUTCMonth();if(n>=0&&+month(a,n)>+b)n--;if(n<0&&+month(a,n)<+b)n++;return n;};\n return {DAY,own,fail,num,choice,date,iso,shift,month,weekdays,work,wholeMonths};\n})();const result=(function(v,h){\n const {num,choice,fail}=h;choice(v.wallMode,['wall','room']);choice(v.calculationMode,['drops','area']);num(v.wallHeight,0.01,100);num(v.deductions,0,1e6);num(v.wastePct,0,100);\n let perimeter=v.wallWidth;if(v.wallMode==='room'){num(v.length,0.01,1000);num(v.width,0.01,1000);perimeter=2*(v.length+v.width);}else num(v.wallWidth,0.01,5000);\n const totalArea=perimeter*v.wallHeight;if(v.deductions>totalArea)throw new Error('openingsExceedWallArea');const netArea=totalArea-v.deductions;\n if(v.calculationMode==='area'){num(v.coverage,0.01,10000);const rolls=Math.ceil(netArea*(1+v.wastePct/100)/v.coverage);return {totalArea,wallArea:totalArea,netArea,perimeter,drops:null,usablePerRoll:null,rollsNeeded:rolls,rolls,repeatMultiplier:null,linearFeet:null,cutsPerRoll:null};}\n num(v.rollLength,0.01,1000);num(v.rollWidth,0.01,20);num(v.patternRepeat,0,120);num(v.trimIn,0,120);\n const repeat=v.patternRepeat/12,raw=v.wallHeight+v.trimIn/12,dropLength=repeat?Math.ceil(raw/repeat-1e-12)*repeat:raw,cutsPerRoll=Math.floor(v.rollLength/dropLength+1e-12);if(cutsPerRoll<1)fail();\n const drops=v.wallMode==='room'?2*Math.ceil(v.length/v.rollWidth)+2*Math.ceil(v.width/v.rollWidth):Math.ceil(perimeter/v.rollWidth),allowanceDrops=Math.ceil(drops*(1+v.wastePct/100)-1e-12),rollsNeeded=Math.ceil(allowanceDrops/cutsPerRoll);\n return {totalArea,wallArea:totalArea,netArea,perimeter,drops,usablePerRoll:cutsPerRoll*dropLength,rollsNeeded,rolls:rollsNeeded,repeatMultiplier:dropLength/v.wallHeight,linearFeet:rollsNeeded*v.rollLength,cutsPerRoll};\n })({\"wallMode\":(wallMode),\"calculationMode\":(calculationMode),\"wallWidth\":(wallWidth),\"wallHeight\":(wallHeight),\"deductions\":(deductions),\"length\":(length),\"width\":(width),\"rollLength\":(rollLength),\"rollWidth\":(rollWidth),\"patternRepeat\":(patternRepeat),\"trimIn\":(trimIn),\"wastePct\":(wastePct),\"coverage\":(coverage)},h);return result;};const out=calculate();return Object.fromEntries([\"totalArea\",\"netArea\",\"drops\",\"usablePerRoll\",\"rollsNeeded\",\"repeatMultiplier\",\"linearFeet\",\"cutsPerRoll\",\"perimeter\"].map(k=>[k,out[k]??null]).concat(Object.entries(out).filter(([k])=>k.startsWith('__'))));}catch(error){return Object.assign(Object.fromEntries([\"totalArea\",\"netArea\",\"drops\",\"usablePerRoll\",\"rollsNeeded\",\"repeatMultiplier\",\"linearFeet\",\"cutsPerRoll\",\"perimeter\"].map(k=>[k,null])),{__error:error.message==='openingsExceedWallArea'?'openingsExceedWallArea':'inputError'});}", "inputs": [ { "name": "wallWidth", "type": "number", "default": 40, "min": 0.01, "max": 5000, "step": 0.01, "slider": true, "strictRange": true, "requiredValue": true, "showWhen": { "wallMode": [ "wall" ] } }, { "name": "wallHeight", "type": "number", "default": 9, "min": 1, "max": 40, "step": 0.1, "slider": true, "strictRange": true, "requiredValue": true }, { "name": "rollLength", "type": "number", "default": 33, "min": 0.01, "max": 1000, "step": 0.01, "slider": true, "strictRange": true, "requiredValue": true, "showWhen": { "calculationMode": [ "drops" ] } }, { "name": "rollWidth", "type": "number", "default": 1.75, "min": 0.01, "max": 20, "step": 0.01, "slider": true, "strictRange": true, "requiredValue": true, "showWhen": { "calculationMode": [ "drops" ] } }, { "name": "patternRepeat", "type": "number", "default": 12, "min": 0, "max": 120, "step": 0.01, "slider": true, "strictRange": true, "requiredValue": true, "showWhen": { "calculationMode": [ "drops" ] } }, { "name": "deductions", "type": "number", "default": 60, "min": 0, "max": 5000, "step": 1, "slider": true, "strictRange": true, "requiredValue": true }, { "name": "wastePct", "type": "number", "default": 10, "min": 0, "max": 100, "step": 0.01, "slider": true, "strictRange": true, "requiredValue": true }, { "type": "select", "default": "wall", "options": [ { "value": "wall" }, { "value": "room" } ], "advanced": true, "name": "wallMode" }, { "type": "select", "default": "drops", "options": [ { "value": "drops" }, { "value": "area" } ], "advanced": true, "name": "calculationMode" }, { "type": "number", "default": 14, "min": 0.01, "max": 1000, "step": 0.01, "strictRange": true, "requiredValue": true, "advanced": true, "name": "length", "showWhen": { "wallMode": [ "room" ] } }, { "type": "number", "default": 12, "min": 0.01, "max": 1000, "step": 0.01, "strictRange": true, "requiredValue": true, "advanced": true, "name": "width", "showWhen": { "wallMode": [ "room" ] } }, { "type": "number", "default": 0, "min": 0, "max": 120, "step": 0.01, "strictRange": true, "requiredValue": true, "advanced": true, "name": "trimIn", "showWhen": { "calculationMode": [ "drops" ] } }, { "type": "number", "default": 45, "min": 0.01, "max": 10000, "step": 0.01, "strictRange": true, "requiredValue": true, "advanced": true, "name": "coverage", "showWhen": { "calculationMode": [ "area" ] } } ], "outputs": [ { "name": "totalArea", "precision": 1, "unit": "sq ft", "notation": "auto" }, { "name": "netArea", "precision": 1, "unit": "sq ft", "notation": "auto" }, { "name": "drops", "precision": 0, "unit": "", "notation": "auto", "optional": true }, { "name": "usablePerRoll", "precision": 2, "unit": "ft", "notation": "auto", "optional": true }, { "name": "rollsNeeded", "precision": 0, "unit": "", "notation": "auto" }, { "name": "repeatMultiplier", "precision": 2, "unit": "x", "notation": "auto", "optional": true }, { "name": "linearFeet", "precision": 1, "unit": "ft", "notation": "auto", "optional": true }, { "precision": 0, "unit": "", "optional": true, "name": "cutsPerRoll", "notation": "auto" }, { "name": "perimeter", "precision": 1, "unit": "ft", "notation": "auto" } ], "interpret": null } }