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<script>
import { onMount } from "svelte";
import Plotly from "plotly.js-basic-dist-min";
let x0 = 0, y0 = 0, x1 = 4, y1 = 4;
let dx, dy;
let steps;
let x_inc, y_inc;
let x_axis = [], y_axis = [];
let x_axis_floored = [], y_axis_floored = [];
function dda() {
dx = Math.abs(x1 - x0);
dy = Math.abs(y1 - y0);
steps = Math.max(...[dx, dy].map(x => Math.abs(x)));
x_inc = dx / steps;
y_inc = dy / steps;
// Build the x axis.
x_axis = [];
let X = x0;
for (let idx = 0; idx < steps; idx++) {
X += x_inc;
x_axis.push(X.toPrecision(3));
}
x_axis_floored = x_axis.map(function(x) {return Math.round(x)});
// Build the y axis.
y_axis = [];
let Y = y0;
for (let idx = 0; idx < steps; idx++) {
Y += y_inc;
y_axis.push(Y.toPrecision(3));
}
y_axis_floored = y_axis.map(function(y) {return Math.round(y)});
// Plot the chart.
Plotly.newPlot('algoChart', [{
x: x_axis_floored,
y: y_axis_floored,
type: 'lines',
name: 'DDA'
}]);
}
onMount(() => {
dda();
});
</script>
<h2>Digital differential analyzer</h2>
<form class="points">
<label for="x0">x0: </label>
<input type="number" id="x0" name="x0" on:change={dda} bind:value={x0}>
<label for="y0">y0: </label>
<input type="number" id="y0" name="y0" on:change={dda} bind:value={y0}>
<br>
<label for="x1">x1: </label>
<input type="number" id="x1" name="x1" on:change={dda} bind:value={x1}>
<label for="y1">y1: </label>
<input type="number" id="y1" name="y1" on:change={dda} bind:value={y1}>
<br>
<button type="button" on:click={dda}>Solve</button>
</form>
<hr>
<h3>Solution</h3>
<label for="dx">dx = <code>|x1 - x0|</code>: </label>
<input type="text" id="dx" name="dx" value={dx} disabled><br>
<label for="dy">dy = <code>|y1 - y0|</code>: </label>
<input type="text" id="dy" name="dy" value={dy} disabled>
<br>
<label for="steps">steps: </label>
<input type="text" id="steps" name="steps" value={steps} disabled>
<br>
<label for="x_inc">x Increment = <code>dx / steps</code>: </label>
<input type="text" id="x_inc" name="x_inc" value={x_inc} disabled><br>
<label for="y_inc">y Increment = <code>dy / steps</code>: </label>
<input type="text" id="y_inc" name="y_inc" value={y_inc} disabled>
<details>
<summary>
Table
</summary>
<table>
<thead>
<tr>
<th>Iteration</th>
<th>x</th>
<th>y</th>
<th>x (plot)</th>
<th>y (plot)</th>
</tr>
</thead>
<tbody>
{#each x_axis as _, i}
<tr>
<td>{i + 1}</td>
<td>{x_axis[i]}</td>
<td>{y_axis[i]}</td>
<td>{x_axis_floored[i]}</td>
<td>{y_axis_floored[i]}</td>
</tr>
{/each}
</tbody>
</table>
</details>
<h3>Graph</h3>
<div id="algoChart"></div>
<style>
hr { color: var(--bg-hl-alt-intense); }
button {
margin: .8em;
padding: 0.4em 1.2em;
width: 100%;
}
details {
border: 1px solid var(--bg-alt);
border-radius: 4px;
padding: 0.8em;
margin: 1em;
}
</style>
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