public void draw String string State first state first for int string

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public void draw(String string, State first) {
state = first;
for (int i = 0; i < string.length(); ++i) {
switch (string.charAt(i)) {
case 'F':
drawStep();
break;
case 'b':
moveStep();
break;
case '+':
rotateRight();
break;
case '-':
rotateLeft();
break;
case '[':
pushState();
break;
case ']':
popState();
break;
default:
break;
}
}
}
private void drawStep() {
double oldX = state.getX();
double oldY = state.getY();
double angle = state.getAngle();
double newX = oldX + Math.cos(angle) * stepLength;
double newY = oldY - Math.sin(angle) * stepLength;
canvas.drawLine(oldX, oldY, newX, newY);
state = new State(newX, newY, angle);
}
private void moveStep() {
double oldX = state.getX();
double oldY = state.getY();
double angle = state.getAngle();
double newX = oldX + Math.cos(angle) * stepLength;
double newY = oldY - Math.sin(angle) * stepLength;
state = new State(newX, newY, angle);
}
private void rotateRight() {
double x = state.getX();
double y = state.getY();
double oldAngle = state.getAngle();
double newAngle = oldAngle - deltaAngle;
state = new State(x, y, newAngle);
}
private void rotateLeft() {
double x = state.getX();
double y = state.getY();
double oldAngle = state.getAngle();
double newAngle = oldAngle + deltaAngle;
state = new State(x, y, newAngle);
}
private void pushState() {
memory.push(state);
}
private void popState() {
state = memory.lastElement();
memory.pop();
}