Stepper switch case millis

void loop() {

    int state = 0;

    if (currentMillis - previousMillis > interval) {
        previousMillis = currentMillis;

        if (OpenedState == LOW && temperature > SetTemp + 0.10) {
            state = 1;
            steps++;
                if (steps >= 8)
                    steps = 0;
        }

        if (ClosedState == LOW && temperature < SetTemp - 0.10) {
            state = 1;
            steps--;
                if (steps <= 0)
                    steps = 8;
        }

        switch(steps){
            case 0:
                digitalWrite(Pin1, LOW);
                digitalWrite(Pin2, LOW);
                digitalWrite(Pin3, LOW);
                digitalWrite(Pin4, HIGH);
                break;
            case 1:
                digitalWrite(Pin1, LOW);
                digitalWrite(Pin2, LOW);
                digitalWrite(Pin3, HIGH);
                digitalWrite(Pin4, HIGH);
                break;
            case 2:
                digitalWrite(Pin1, LOW);
                digitalWrite(Pin2, LOW);
                digitalWrite(Pin3, HIGH);
                digitalWrite(Pin4, LOW);
                break;
            case 3:
                digitalWrite(Pin1, LOW);
                digitalWrite(Pin2, HIGH);
                digitalWrite(Pin3, HIGH);
                digitalWrite(Pin4, LOW);
                break;
            case 4:
                digitalWrite(Pin1, LOW);
                digitalWrite(Pin2, HIGH);
                digitalWrite(Pin3, LOW);
                digitalWrite(Pin4, LOW);
                break;
            case 5:
                digitalWrite(Pin1, HIGH);
                digitalWrite(Pin2, HIGH);
                digitalWrite(Pin3, LOW);
                digitalWrite(Pin4, LOW);
                break;
            case 6:
                digitalWrite(Pin1, HIGH);
                digitalWrite(Pin2, LOW);
                digitalWrite(Pin3, LOW);
                digitalWrite(Pin4, LOW);
                break;
            case 7:
                digitalWrite(Pin1, HIGH);
                digitalWrite(Pin2, LOW);
                digitalWrite(Pin3, LOW);
                digitalWrite(Pin4, HIGH);
                break;
            default:
                digitalWrite(Pin1, LOW);
                digitalWrite(Pin2, LOW);
                digitalWrite(Pin3, LOW);
                digitalWrite(Pin4, LOW);
                break;
        }
        if (state == 0) {
            steps = 8;
        }
    }
}