Line clipping fail

    static bool, Vector2, Vector2 LineClipCircle (Vector2 v1, Vector2 v2, Vector2 c, double r) {
        let a = v1;
        let b = v2 - v1;
        let d = a - c;

        double quadA = b dot b;
        double quadB = b dot d;
        double quadC = d dot d - r * r;

        double discriminant = quadB * quadB - 4 * quadA * quadC;

        if (discriminant < 0) {
            return false, v1, v2;
        } else {
            double discSqrt = sqrt (discriminant);
            let lambda0 = (-quadB + discSqrt) / (2 * quadA);
            let lambda1 = (-quadB - discSqrt) / (2 * quadA);
            let interPoint0 = a + lambda0 * b;
            let interPoint1 = a + lambda1 * b;

            return true, interPoint0, interPoint1;
        }
    }

    [...]

            double angleCos = Cos (-pPawn.angle), angleSin = Sin (-pPawn.angle);
            Vector3 pPawnXYPos = (pPawn.prev + (TicFrac * (pPawn.pos - pPawn.prev)));
            Vector2 radarOffs = (radarPos.x - RADAR_RADIUS, radarPos.y + RADAR_RADIUS);

            let linesIterator = BlockLinesIterator.Create (CPlayer.mo, RADAR_MAXDIST);
            while (linesIterator.Next ()) {
                let curLine = linesIterator.CurLine;

                // Coords
                Vector2 worldPosV0 = (pPawnXYPos.xy - curLine.v1.p) / RADAR_SCALE, screenPosV0 = radarOffs;
                Vector2 worldPosV1 = (pPawnXYPos.xy - curLine.v2.p) / RADAR_SCALE, screenPosV1 = radarOffs;

                screenPosV0 += (worldPosV0.x * angleSin + worldPosV0.y * angleCos,
                                worldPosV0.x * angleCos - worldPosV0.y * angleSin);
                screenPosV1 += (worldPosV1.x * angleSin + worldPosV1.y * angleCos,
                                worldPosV1.x * angleCos - worldPosV1.y * angleSin);

                bool intersected;
                [intersected, screenPosV0, screenPosV1] = LineClipCircle (screenPosV0, screenPosV1, radarOffs, RADAR_RADIUS);

                if (!intersected)
                    continue;

                if (screenPosV0 == screenPosV1) // Just in case
                    continue;

                DrawLine (screenPosV0, screenPosV1, Color (256, 256, 256, 0), DI_SCREEN_RIGHT_TOP);
            }