graphics.drawRectangle(Pens.Black, x, y, width, height);

//draw the sides of the cube black
for (int i=-10;x<0;i++)
     graphics.drawRectangle(Pens.Black, x+i, y+i, width, height);
//draw the front of the cube red
graphics.fillRectangle(Brushes.Red, x, y, width, height);