package Curve;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;

class MyCanvas extends Canvas{
	int pointnum,x=10;
	int a[];
	
	MyCanvas(){
		setSize(300,300);
	}
	
	public void set(int a[],int i){
		this.a=a;
		this.pointnum=i;
	}
	public void paint(Graphics g){
		g.setColor(Color.red);
		if(pointnum>=1){                   //從有一個點開始畫圓
			for(int i=1;i<=pointnum;i++){
				g.fillOval(x,a[i],5,5);
				x+=20;
			}
			x=10;
		}
		if(pointnum>1){					//從有兩個點開始畫
			for(int i=1;i<=pointnum;i++){
				g.drawLine(x,a[i],x+=20,a[i+1]);
				if(i+1>=pointnum) break;
			}
			x=10;                //每次調用之前將x還原
		}
	}
}