Function worldToScreen

src/engineDraw.js:1003–1021

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

(worldPos)

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

    let x = worldPos.x - cameraPos.x;
    let y = worldPos.y - cameraPos.y;
    if (cameraAngle)
    {
        // apply inverse 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 *  cameraScale + mainCanvasSize.x/2 - .5,
        y * -cameraScale + mainCanvasSize.y/2 - .5
    );
}

/** Convert from screen to world space coordinates for a directional vector (no translation)
 *  @param {Vector2} screenDelta