Function screenToWorld

src/engineDraw.js:983–997

Convert from screen to world space coordinates * @param {Vector2} screenPos * @return {Vector2} * @memberof Draw

(screenPos)

 *  @return {Vector2}
 *  @memberof Draw */
function screenToWorld(screenPos)
{
    ASSERT(isVector2(screenPos), 'screenPos must be a vec2');

    let x = (screenPos.x - mainCanvasSize.x/2 + .5) /  cameraScale;
    let y = (screenPos.y - mainCanvasSize.y/2 + .5) / -cameraScale;
    if (cameraAngle)
    {
        // apply camera rotation
        const c = cos(-cameraAngle), s = sin(-cameraAngle);
        const xr = x * c - y * s, yr = x * s + y * c;
        x = xr; y = yr;
    }
    return new Vector2(x + cameraPos.x, y + cameraPos.y);
}

/** Convert from world to screen space coordinates
 *  @param {Vector2} worldPos