寒假日报day9

今天呢，换个思路走了，先停一停数据爬虫的工作，赶赶其他作业的进度，

上次scala呢，写完了第一个实验，今天写了第二个实验，即模拟图形绘制的实验

不多说，上代码:

package com.ms.firstWork

object SecondWork {

  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
  }

}


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

  def shift(deltaX: Double, deltaY: Double) {
    Px += deltaX
    Py += deltaY
  }

  override def draw(): Unit = {
    println("Point:(" + Px + "," + Py + ")")
  }
}

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

abstract class Shape extends Drawable {
  def moveTo(point: Point)

  def zoom(step: Double)

  def draw()
}

class Line(point1: Point, point2: Point) extends Shape {
  override def moveTo(point: Point): Unit = {
    point1.shift(point.Px, point.Py)
    point2.shift(point.Px, point.Py)
  }

  override def zoom(step: Double): Unit = {
    var tempx = (point2.Px + point1.Px) / 2 - point1.Px
    if (tempx < 0) {
      tempx = 0 - tempx
    }
    var centerx = ((point2.Px + point1.Px) / 2)
    var zoomlengthx = (tempx * step)
    point1.Px = centerx - zoomlengthx
    point2.Px = centerx + zoomlengthx

    var tempy = (point2.Py + point1.Py) / 2 - point1.Py
    if (tempy < 0) {
      tempy = 0 - tempy
    }
    var centery = ((point2.Py + point1.Py) / 2)
    var zoomlengthy = (tempy * step)
    point1.Py = centery - zoomlengthy
    point2.Py = centery + zoomlengthy
  }

  override def draw(): Unit = {
    println("Line:(" + point1.Px + "," + point1.Py + ")--(" + point2.Px + "," + point2.Py + ")")
  }
}

class Circle(point: Point, r: Double) extends Shape {
  var R=r
  override def moveTo(point: Point): Unit = {
    this.point.Px=point.Px
    this.point.Py=point.Py
  }

  override def zoom(step: Double): Unit = {
    R=R*step
  }

  override def draw(): Unit = {
    println("Circle center:(" + point.Px + "," + point.Py + "),R=" + R)
  }
}

运行截图：

 这个比较简单，在菜鸟，w3school上都有教程，我个人推荐w3school因为这个比较新，教程较菜鸟版本比较适应我们，菜鸟有一些过时。