[Dart Lang] Algorithm : แสดงผลรูปหัวใจ และ เลื่อนรูปหัวใจลงทีละ step

main.dart

void main() {
  for (var i = 0; i <= 5; i++) {
    show(i);
  }
}
 
void show(int n) {
  // กำหนด list ของจุดค่าเริ่มต้น
 
  print("Step ที่ " + n.toString() + " : ");
 
  var myList = [
    ["*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "*", "#", "#", "#", "*", "*", "*", "*", "#", "#", "#", "*", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "#", "#", "#", "#", "#", "*", "*", "#", "#", "#", "#", "#", "*", "*", "*", "*"],
    ["*", "*", "*", "#", "#", "#", "#", "#", "#", "#", "#", "#", "#", "#", "#", "#", "#", "*", "*", "*"],
    ["*", "*", "*", "*", "#", "#", "#", "#", "#", "#", "#", "#", "#", "#", "#", "#", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "*", "#", "#", "#", "#", "#", "#", "#", "#", "#", "#", "*", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "*", "*", "#", "#", "#", "#", "#", "#", "#", "#", "*", "*", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "*", "*", "*", "#", "#", "#", "#", "#", "#", "*", "*", "*", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "*", "*", "*", "*", "#", "#", "#", "#", "*", "*", "*", "*", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "*", "*", "*", "*", "*", "#", "#", "*", "*", "*", "*", "*", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*"],
    ["*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*", "*"],
  ];
 
  // กำหนดให้ข้อความเริ่มต้นเป็น ""
  String txt = "";
 
  // เริ่มต้น i ด้วย 0 - n เช่น ถ้า n = 5 จะเริ่มต้นด้วย 0 - 5 = -5
  int i = 0 - n;
 
  // กำหนดความยาวของของ list โดยนำความยาวทั้งหมดมาลบออกด้วย n เช่น 13-5 = 8
  int listLength = myList.length - n;
 
  // ระหว่าง -5 ถึง 8 จะมีความยาวของ list คือ 13 เช่นเดิม
 
  //เริ่มต้น loop จาก i ที่ 0 ถึง listLength - 1
  for (i; i < listLength; i++) {
    for (var j = 0; j < myList[i % myList.length].length; j++) {
      // บันทึกค่าแต่ละแถวใน txt
      txt += myList[i % myList.length][j];
    }
    // ขึ้นบรรทัดใหม่
    txt += "\n";
  }
  // แสดงผลของ txt
  print(txt);
  // แสดงรหัสนักศึกษา
  print("64112123 นายสมชาย ใจดี");
  print("\n");
}