/** 南极平移动向的定点诊断：直接调 shiftPivot，看每一步落点。 */
import * as camera from '../../../src/modules/cockpit/domain/camera.js'

const mpp = camera.metersPerPixel({ range: 25996782, fovYRad: (60 * Math.PI) / 180, viewportHeight: 950 })
console.log(`米/像素 = ${Math.round(mpp)}；40px = ${(40 * mpp / 1000).toFixed(0)} km`)

for (const [name, start, dyPx] of [
    ['北极上空向南拖', { lon: 0, lat: 89.5, height: 0 }, -40],
    ['南极上空向南拖', { lon: 0, lat: -89.5, height: 0 }, -40],
    ['南极上空向北拖', { lon: 0, lat: -89.5, height: 0 }, +40],
]) {
    console.log(`\n== ${name}（起始 ${start.lon},${start.lat}）==`)
    let pivot = start
    for (let i = 1; i <= 6; i += 1) {
        const offset = camera.pivotOffsetMeters({ headingDeg: 0, dxPx: 0, dyPx, metersPerPx: mpp })
        const next = camera.shiftPivot(pivot, offset)
        console.log(
            `  ${i}: east=${Math.round(offset.east)} north=${Math.round(offset.north)}` +
                ` → ${next.lon.toFixed(4)},${next.lat.toFixed(4)}` +
                `  |Δlat|=${Math.abs(next.lat - pivot.lat).toFixed(4)}`,
        )
        pivot = next
    }
}