点的弓形运动

最新推荐文章于 2022-11-23 17:10:36 发布

liyingwei

最新推荐文章于 2022-11-23 17:10:36 发布

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CC 4.0 BY-SA版权

文章标签：一个点在矩形内做弓形运动

本文链接：https://blog.youkuaiyun.com/liyingwei/article/details/84241432

一个点在矩形内做弓形运动：

主要运动类MotionTrace.java

package org.lyw.sh.test;

import java.text.DecimalFormat;

public class MotionTrace {

	private static int count = 0;

	private static boolean runFlag = true;

	private double startX;
	private double startY;

	private double minX;
	private double minY;

	private double maxX;
	private double maxY;

	private double increase = 0.0;

	private double distance;

	private double rate;

	private double directionX = 1.0;

	private double directionY = 1.0;

	public MotionTrace() {
		startX = 0;
		startY = 0;

		minX = 0;
		minY = 0;

		maxX = 500.0;
		maxY = 500.0;

		distance = 30;

		rate = 0.000009;
	}

	public void directionY() {
		System.err.println("--------------Y:" + directionY + "--------------");
		// --------------(+0.000000,0.000000+)--------------
		// --------------(+0.009000,0.009000+)--------------
		// System.out.println("--------------(+" + doubleFormat(minX * rate) +
		// ","
		// + doubleFormat(minY * rate) + "+)--------------");
		// System.out.println("--------------(+" + doubleFormat(maxX * rate) +
		// ","
		// + doubleFormat(maxY * rate) + "+)--------------");

		if (startX > maxX) {
			directionX = -directionX;
			startX = startX + distance * directionX;
			count = 1;
			runFlag = false;
			return;
			// directionX();
		} else if (startX < minX) {
			count = 1;
			directionX = -directionX;
			startX = startX + distance * directionX;
			// directionX();
			runFlag = false;
			return;
		}

		if (0 == count) {

			increase = startY;

		} else {

			increase = startY + distance * count * directionY;
		}

		if (!isBeyond(increase, minY, maxY)) {

			System.err.println("(" + doubleFormat(startX * rate) + ","
					+ doubleFormat(increase * rate) + ")");
		} else {
			count = -1;
			directionY = -directionY;
			startY = increase + distance * directionY;
			startX = startX + distance * directionX;
			//
			// if (startX > maxX) {
			// directionX = -directionX;
			// startX = startX + distance * directionX;
			// count = 0;
			// directionX();
			// } else if (startX < minX) {
			// count = 0;
			// directionX = -directionX;
			// startX = startX + distance * directionX;
			// directionX();
			// }

		}
		// } else if (increase > maxY) {
		// System.err.println("TOP");
		// count = 1;
		// directionY = -directionY;
		// startY = increase + distance * directionY;
		// startX = startX + distance * directionX;
		// } else if (increase < minY) {
		// System.err.println("BUTTON");
		// count = 1;
		// directionY = -directionY;
		// startY = increase + distance * directionY;
		// startX = startX + distance * directionX;
		// }
		count++;
	}

	public void directionX() {
		System.err.println("--------------X:" + directionX + "--------------");
		// --------------(+0.000000,0.000000+)--------------
		// --------------(+0.009000,0.009000+)--------------
		// System.out.println("--------------(+" + doubleFormat(minX * rate) +
		// ","
		// + doubleFormat(minY * rate) + "+)--------------");
		// System.out.println("--------------(+" + doubleFormat(maxX * rate) +
		// ","
		// + doubleFormat(maxY * rate) + "+)--------------");

		if (startY > maxY) {
			directionY = -directionY;
			startY = startY + distance * directionY;
			count = 1;
			runFlag = true;
			return;
			// directionY();
		} else if (startY < minY) {
			count = 1;
			directionY = -directionY;
			startY = startY + distance * directionY;
			runFlag = true;
			return;
			// directionY();
		}

		if (0 == count) {

			increase = startX;

		} else {

			increase = startX + distance * count * directionX;
		}

		if (!isBeyond(increase, minX, maxX)) {

			System.err.println("(" + doubleFormat(increase * rate) + ","
					+ doubleFormat(startY * rate) + ")");
		} else {
			// System.err.println("BEYOND");
			count = -1;
			directionX = -directionX;
			startX = increase + distance * directionX;
			startY = startY + distance * directionY;

			// if (startY > maxY) {
			// directionY = -directionY;
			// startY = startY + distance * directionY;
			// count = 0;
			// directionY();
			// } else if (startY < minY) {
			// count = 0;
			// directionY = -directionY;
			// startY = startY + distance * directionY;
			// directionY();
			// }
		}
		// } else if (increase > maxX) {
		// System.err.println("TOP");
		// count = 1;
		// directionX = -directionX;
		// startX = increase + distance * directionX;
		// startY = startY + distance * directionY;
		// } else if (increase < minX) {
		// System.err.println("BUTTON");
		// count = 1;
		// directionX = -directionX;
		// startX = increase + distance * directionX;
		// startY = startY + distance * directionY;
		// }
		count++;
	}

	private String doubleFormat(double dbl) {

		DecimalFormat dft = new DecimalFormat("#####0.000000");

		return dft.format(dbl);
	}

	private boolean isBeyond(double ori, double min, double max) {

		if (ori < min || ori > max) {
			return true;
		}
		return false;

	}

	public double getDirectionX() {
		return directionX;
	}

	public void setDirectionX(double directionX) {
		this.directionX = directionX;
	}

	public double getDirectionY() {
		return directionY;
	}

	public void setDirectionY(double directionY) {
		this.directionY = directionY;
	}

	public static boolean isRunFlag() {
		return runFlag;
	}

	public static void setRunFlag(boolean runFlag) {
		MotionTrace.runFlag = runFlag;
	}

}

用java调度器调用类MotionMain.java

package org.lyw.sh.test;

import java.util.Timer;
import java.util.TimerTask;

public class MotionMain {

	public static void main(String[] args) {

		TimerTask task = new TimerTask() {

			MotionTrace motion = new MotionTrace();

			@Override
			public void run() {
				if (MotionTrace.isRunFlag()) {
					motion.directionY();
				} else {
					motion.directionX();
				}

			}
		};

		Timer timer = new Timer();

		timer.schedule(task, 0, 100);
	}
}