Let's start coding the app. For now I'll hardcode some static assumptions like:
- we don't care about crit damage
- we don't care about stability damage
- 10 ammo per weapon
- 100% of heat compensated by single heat sinks, so 1 extra ton per 3 heat
Lodash sortBy
JavaScript standard library has an embarassing lack of a lot of basic functionality. I have little patience for writing it all myself every time, so we'll be using lodash for its sortBy function. Its API is quite inconvenient, but it works.
App.svelte
<script>
import data from "./data.json"
import Row from "./Row.svelte"
import {sortBy} from "lodash"
let round100 = (v) => Math.round(v * 100) / 100
for (let row of data) {
row.value = row.shots * row.baseDamage
row.ammoWeight = round100(10 * row.ammoTonnagePerShot)
row.cost = round100(row.tonnage + row.ammoWeight + row.heat/3.0)
row.ratio = round100(row.value / row.cost)
}
let sortedData = sortBy(data, [(x) => -x.ratio, (x) => x.name])
</script>
<h1>BATTLETECH Weapons Data</h1>
<table>
<tr>
<th>Name</th>
<th>Damage</th>
<th>Heat</th>
<th>Weight</th>
<th>Ammo Weight</th>
<th>Range</th>
<th>Value</th>
<th>Cost</th>
<th>Ratio</th>
</tr>
{#each sortedData as row}
<Row data={row} />
{/each}
</table>
<style>
:global(body) {
margin: 0;
min-height: 100vh;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
table :global(tr):nth-child(even) {
background-color: #f2f2f2;
}
table :global(tr):nth-child(odd) {
background-color: #e0e0e0;
}
</style>
Here's the main component. We statically precalculate various derived data here. These assumptions will turn into sliders.
Some other points:
- there's fairly messy
:globalto make odd/even shading work with tables across component boundary; it's not the only way, but it will do -
let sortedData = sortBy(data, [(x) => -x.ratio, (x) => x.name])is some really awkward API
Row.svelte
This component is much easier. Damage and Range column need some custom formatting. Range column could sure be a lot better with some colored bars instead.
Rounding to 2 decimal places could arguably be handled here instead of in the App component.
<script>
export let data
let {name, heat, shots, baseDamage, tonnage, minRange, maxRange, value, cost, ratio, ammoWeight} = data
let damage
if (shots == 1) {
damage = baseDamage
} else {
damage = `${shots}x${baseDamage}`
}
let range = `${minRange}-${maxRange}`
</script>
<tr>
<td>{name}</td>
<td>{damage}</td>
<td>{heat}</td>
<td>{tonnage}</td>
<td>{ammoWeight}</td>
<td>{range}</td>
<td>{value}</td>
<td>{cost}</td>
<td>{ratio}</td>
</tr>
Story so far
I deployed this on GitHub Pages, you can see it here.
Coming next
In the next episode I'll add some sliders to control assumptions made.
Top comments (0)