Rotate Image by pressing button - arduino

Question

So I am programming scrips with Arduino and I am supposed to make an arrow that turns 90 degrees when the up button is pressed. I don't really understand how I am supposed to make it turn when the Up button is pressed. I provided the whole code if you want to test it. I'm doing it in german so "unten" is bottom and "oben" is top
#include <Arduino.h>
#include <Adafruit_GFX.h>
#include <Adafruit_LEDBackpack.h>
Adafruit_8x8matrix matrix = Adafruit_8x8matrix();
const int IO_BUTTON_UP = 4;
void setup() {
Serial.begin(115200);
Serial.println("Matrix8x8");
Serial.println("<Autor>");
matrix.begin(0x70);
matrix.setBrightness(1);
pinMode(IO_BUTTON_UP, INPUT);
}
int loops = 0;
void loop() {
Serial.println("loop");
int ON = 1;
int OFF = 0;
int unten = 0;
int oben = 7;
int rotation = 0;
matrix.setRotation(rotation);
if (digitalRead(IO_BUTTON_UP) == 1){
rotation ++;
}
if (loops == 0){
unten = 3;
oben = 4;
} else if (loops == 1){
unten = 3;
oben = 4;
} else if (loops == 2){
unten = 3;
oben = 4;
} else if (loops == 3){
unten = 3;
oben = 4;
} else if (loops == 4){
unten = 0;
oben = 7;
} else if (loops == 5){
unten = 1;
oben = 6;
} else if (loops == 6){
unten = 2;
oben = 5;
} else if (loops == 7){
unten = 3;
oben = 4;
}
for (int i = unten; i <= oben; i++){
matrix.drawPixel(loops, i, ON);
}
matrix.writeDisplay();
delay(200);
if (loops == 7){
delay (200);
matrix.clear();
matrix.writeDisplay();
delay (200);
}
loops = (loops = loops + 1) % 8;
Serial.print ("loops: ");
Serial.println (loops);
}

Answer 1

I got an answer. I just had to define "rotation" outside of the "void loop"
#include <Arduino.h>
#include <Adafruit_GFX.h>
#include <Adafruit_LEDBackpack.h>
Adafruit_8x8matrix matrix = Adafruit_8x8matrix();
int IO_BUTTON_UP = 4;
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.println("Matrix8x8");
Serial.println("<Autor>");
matrix.begin(0x70);
matrix.setBrightness(1);
pinMode(IO_BUTTON_UP, INPUT);
}
int loops = 0;
int rotation = 0;
void loop() {
// put your main code here, to run repeatedly:
Serial.println("loop");
int ON = 1;
int OFF = 0;
int unten = 0;
int oben = 7;
Serial.println(IO_BUTTON_UP);
if (digitalRead(IO_BUTTON_UP) == 1){
rotation++;
}
matrix.setRotation(rotation);
if (loops == 0){
unten = 3;
oben = 4;
} else if (loops == 1){
unten = 3;
oben = 4;
} else if (loops == 2){
unten = 3;
oben = 4;
} else if (loops == 3){
unten = 3;
oben = 4;
} else if (loops == 4){
unten = 0;
oben = 7;
} else if (loops == 5){
unten = 1;
oben = 6;
} else if (loops == 6){
unten = 2;
oben = 5;
} else if (loops == 7){
unten = 3;
oben = 4;
}
for (int i = unten; i <= oben; i++){
matrix.drawPixel(loops, i, ON);
}
matrix.writeDisplay();
delay(200);
if (loops == 7){
delay (200);
matrix.clear();
matrix.writeDisplay();
delay (200);
}
loops = (loops = loops + 1) % 8;
Serial.print ("loops: ");
Serial.println (loops);
}