假期五

Posted 2021-03-12 jbwen

模拟图形绘制

 

case class Point(var x:Double,var y:Double) extends Drawable{

def shift(deltaX:Double,deltaY:Double){x+=deltaX;y+=deltaY}

}

trait Drawable{

def draw(){println(this.toString)}

}

// 请完成 Shape 类、Line 类和 Circle 类的定义。

object MyDraw{

def main(args: Array[String]) {

val p=new Point(10,30)

p.draw;

val line1 = new Line(Point(0,0),Point(20,20))

line1.draw

line1.moveTo(Point(5,5)) //移动到一个新的点

line1.draw

line1.zoom(2) //放大两倍

line1.draw

val cir= new Circle(Point(10,10),5)

cir.draw

cir.moveTo(Point(30,20))

cir.draw

cir.zoom(0.5)

cir.draw

}

}

编译运行程序，期望的输出结果如下：

Point(10.0,30.0)

Line:(0.0,0.0)--(20.0,20.0)

Line:(5.0,5.0)--(25.0,25.0)

Line:(-5.0,-5.0)--(35.0,35.0)

Circle center:(10.0