Display a sin(x) wave in java console

Question

My question is about display a sin(x) wave, but transform it vertically 90 degrees to the Y axis

int num = 7;
for (double y = 2; y >= 0; y-=0.2) {
  for (double x = 0; x <= num; x+=0.2) {
    if ( ((0.1+x) >= Math.asin((double)y-1)) && (((double)x-0.1) <= Math.asin((double)y-1)) )
      System.out.print('*');
    else
      System.out.print(' ');
  }
  System.out.println();
}

Answer 1

for (double x = 0; x <= Math.PI; x += 0.15) {
            int sinValue = (int) Math.round(Math.sin(x) * 30);
            for (int j = 0; j < sinValue; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

Answer 2

My advice is to create an array of characters corresponding to the output display. Fill up the array with asterisks as appropriate; you can iterate over X or over Y, whatever is easier, you aren't constrained as you are when you output directly to the console. Depending on how your code is organized, you might fill the array and then transpose it (i.e., swap the (i, j) element with (j, i) element). Finally, print out your array element by element.