Requirement
In this assignment you will write a graphics-based program to do a random
walk , sometimes
also known as a drunkard’s walk. This random walk simulates the wandering of
an intoxicated person on a square street grid. The drunkard will start out in
the middle of the grid and will randomly pick one of the four compass
directions, and take a step in that direction, then another step from that new
location in a random direction, etc.
This assignment will give you practice with creating classes, using loops,
using the java library for random number generation, doing console-based IO,
and drawing to a graphics window. Also you’ll get practice in general program
development.
Analysis
Randow Walk，即 随机游走
问题，类似布朗运动，物体在下一刻走动的方向完全是随机的。本题利用随机数生成器来模拟下一刻的方位。框架使用java的 awt
包实现了UI部分，我们只需要将随机算法加入到提供的框架中。
解题的关键是了解随机数生成器的用法，根据提供的框架，找到对应函数入口，根据给定的测试集进行调试即可。
Tips
从测试函数入口入手
private void testTranslate(Impoint loc, int deltaX, int deltaY) {
…
ImPoint p2 = loc.translate(deltaX, deltaY);
…
}
—|—
因此我们需要实现ImPoint类，以及translate方法，核心代码如下
class ImPoint {
private int x;
private int y;
…
public Impoint translate(int deltaX, int deltaY) {
Random r = new Random();
int x = deltaX + nextInt(2) - 1;
int y = deltaY + nextInt(2) - 1;
return new Impoint(x, y);
}
…
}
—|—
