throughmark/dist/grid/calculator.js

Find and Annotate Features in Images, From Objects to Concepts

export class GridCalculator {
    constructor(config = {}) {
        // Base size for a reference 1000px image
        const baseSize = 150;
        this.config = {
            minCellSize: config.minCellSize ?? baseSize,
            maxCells: config.maxCells ?? 26,
            rows: config.rows ?? 0,
            cols: config.cols ?? 0,
            visible: config.visible ?? true,
            cellLabels: config.cellLabels ?? true,
        };
    }
    calculateDimensions(width, height) {
        if (this.config.rows && this.config.cols) {
            const cellWidth = width / this.config.cols;
            const cellHeight = height / this.config.rows;
            return { width, height, cellWidth, cellHeight };
        }
        // For smaller images, decrease the cell size proportionally
        const scaleFactor = Math.min(width, height) / 1000; // Reference size of 1000px
        const adjustedCellSize = this.config.minCellSize * Math.min(scaleFactor, 1);
        // Calculate dimensions - smaller images get more cells because adjustedCellSize is smaller
        const cellWidth = width /
            Math.min(Math.floor(width / adjustedCellSize), this.config.maxCells);
        const cellHeight = height /
            Math.min(Math.floor(height / adjustedCellSize), this.config.maxCells);
        // Update config with calculated values
        this.config.cols = Math.max(Math.floor(width / cellWidth), 1);
        this.config.rows = Math.max(Math.floor(height / cellHeight), 1);
        return { width, height, cellWidth, cellHeight };
    }
    get currentConfig() {
        return this.config;
    }
}