Struct backend::controller::plant_layer::heatmap

pub struct heatmap;

Endpoint for generating a heatmap signaling ideal locations for planting the plant.

Grey pixels signal areas where the plant shouldn’t be planted, while green areas signal ideal locations.

The resulting heatmap does represent actual coordinates, meaning the pixel at (0,0) is not necessarily at coordinates (0,0). Instead the image has to be moved and scaled to fit inside the maps boundaries. This means the lower left corner of the heatmap has to be moved/scaled to the (x_min,y_min) coordinate, while the upper right corner has to be moved/scaled to (x_max,y_max).

Here is pseudocode for how to move the map to the correct place in the frontend:

// 1. Extract the polygon object from the map:
let polygon = map.geometry;

// 2. Calculate the min and max coordinates for the map:
let x_min = Math.min(...polygon.rings[0].map(point => point.x));
let y_min = Math.min(...polygon.rings[0].map(point => point.y));
let x_max = Math.max(...polygon.rings[0].map(point => point.x));
let y_max = Math.max(...polygon.rings[0].map(point => point.y));

// 3. Calculate the map's width and height:
let map_width = x_max - x_min;
let map_height = y_max - y_min;

// 4. Fetch the heatmap image from the server and draw it on the canvas.
let heatmapResponse = await fetch('/path/to/your/heatmap/endpoint');
let heatmapBlob = await heatmapResponse.blob();

// From https://konvajs.org/docs/shapes/Image.html.
var imageObj = new Image();
imageObj.onload = function () {
    var heatmap = new Konva.Image({
        x: x_min,
        y: y_min,
        image: imageObj,
        width: map_width,
        height: map_height,
    });
    // add the shape to the layer
    layer.add(heatmap);
  };
imageObj.src = URL.createObjectURL(heatmapBlob);

Errors

• If the connection to the database could not be established.

Trait Implementations

impl HttpServiceFactory for heatmap

fn register(self, __config: &mut AppService)