見て、「マウスの動きを追跡するアイトラッキングコードの一部」を見てください

import java.applet.Applet; 
import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.Font; 
import java.awt.Graphics; 
import java.awt.Image; 

import net.java2000.tools.NoNull; 

/** 
* 一段眼睛跟着鼠标转动的跟踪眼代码。<br> 
* 你可以单独运行，或者放在html里面<br> 
* <applet code="Eye" codebase="codebase" width="400" height="135" 
* name="eyesApplet"><br> 
* <param name="faceFile" value="doofus.jpg"/><br> 
* <param name="testMode" value="false"/> <br> 
* <param name="leftEyeX" value="75"/> <br> 
* <param name="leftEyeY" value="77"/> <br> 
* <param name="rightEyeX" value="310"/> <br> 
* <param name="rightEyeY" value="75"/><br> 
* <param name="irisRadius" value="20"/> <br> 
* <param name="pupilRadius" value="8"/><br> 
* <param name="leftEyeRadius" value="5"/><br> 
* <param name="rightEyeRadius" value="5"/> <br> 
* <param name="horizontalSkew" value="3.5"/><br> 
* <param name="eyeIndependence" value="0.4"/> <br> 
* <param name="irisRed" value="128"/><br> 
* <param name="irisGreen" value="64"/> <br> 
* <param name="irisBlue" value="0"/> <br> 
* <param name="verticalOffset" value="100"/> <br> 
* </applet> 
* 
* @author 赵学庆，Java世纪网(java2000.net) 
* 
*/ 
public class Eye extends Applet { 
private static final long serialVersionUID = 4124530672062457469L; 
private String mErrorMessage; 
private Image mFace; 
private Color mIrisColor, mPupilColor = Color.black; 
private int mMouseX, mMouseY; 
private int mLeftEyeX, mLeftEyeY, mRightEyeX, mRightEyeY; 
private int mLeftIrisX, mLeftIrisY, mRightIrisX, mRightIrisY; 
private int mLeftPupilX, mLeftPupilY, mRightPupilX, mRightPupilY; 
private int mIrisRadius, mPupilRadius; 
private int mLeftEyeRadius, mRightEyeRadius, mLeftPupilTR, mRightPupilTR; 
private int mVerticalOffset; 

// 默认值 
private int mFaceX = 0, mFaceY = 0; // image start at 0, 0 
private int mIrisRed = 128, mIrisGreen = 64, mIrisBlue = 0; 
private double mHorizontalSkew = 3.5, mEyeIndependence = 0.5, mGapFactor = 1.5; 
private boolean mTestMode = false; 

private Dimension mDimension; 
private Image mImage; 
private Graphics mGraphics; 

public void init() { 
mErrorMessage = null; 

try { 
// 设置的一些参数 
// 背景的面部图片 
mFace = getImage(getCodeBase(), NoNull.toString(getParameter("faceFile"), "doofus.jpg")); 

// 左侧眼睛的x坐标 
mLeftEyeX = mLeftIrisX = mLeftPupilX = Integer.parseInt(NoNull.toString( 
getParameter("leftEyeX"), "75")); 

// 左侧眼睛的y坐标 
mLeftEyeY = mLeftIrisY = mLeftPupilY = Integer.parseInt(NoNull.toString( 
getParameter("leftEyeY"), "77")); 

// 右侧眼睛的x坐标 
mRightEyeX = mRightIrisX = mRightPupilX = Integer.parseInt(NoNull.toString( 
getParameter("rightEyeX"), "310")); 

// 右侧眼睛的y坐标 
mRightEyeY = mRightIrisY = mRightPupilY = Integer.parseInt(NoNull.toString( 
getParameter("rightEyeY"), "75")); 

// 眼睛的白眼球半径 
mIrisRadius = Integer.parseInt(NoNull.toString(getParameter("irisRadius"), "20")); 

// 眼睛的瞳孔半径 
mPupilRadius = Integer.parseInt(NoNull.toString(getParameter("pupilRadius"), "8")); 

// 左眼睛的移动半径 
mLeftEyeRadius = Integer.parseInt(NoNull.toString(getParameter("leftEyeRadius"), "15")); 

// 右眼睛的移动半径 
mRightEyeRadius = Integer.parseInt(NoNull.toString(getParameter("rightEyeRadius"), "5")); 

// 可选参数 
if (getParameter("testMode") != null) 
mTestMode = Boolean.valueOf(NoNull.toString(getParameter("testMode"), "true")) 
.booleanValue(); 

if (getParameter("horizontalSkew") != null) 
mHorizontalSkew = Double.valueOf( 
NoNull.toString(getParameter("horizontalSkew"), "13.5")).doubleValue(); 
if (getParameter("eyeIndependence") != null) 
mEyeIndependence = Double.valueOf( 
NoNull.toString(getParameter("eyeIndependence"), "0.4")).doubleValue(); 
if (getParameter("irisRed") != null) 
mIrisRed = Integer.parseInt(NoNull.toString(getParameter("irisRed"), "128")); 
if (getParameter("irisGreen") != null) 
mIrisGreen = Integer.parseInt(NoNull.toString(getParameter("irisGreen"), "64")); 
if (getParameter("irisBlue") != null) 
mIrisBlue = Integer.parseInt(NoNull.toString(getParameter("irisBlue"), "0")); 
mIrisColor = new Color(mIrisRed, mIrisGreen, mIrisBlue); 
if (getParameter("verticalOffset") != null) 
mVerticalOffset = Integer.parseInt(NoNull.toString(getParameter("verticalOffset"), 
"100")); 
} catch (Exception e) { 
mErrorMessage = "Bad or missing required parameter."; 
e.printStackTrace(); 
} 

// 计算眼球的移动半径 
mLeftPupilTR = mLeftEyeRadius + mIrisRadius - (int) (mGapFactor * mPupilRadius); 
mRightPupilTR = mRightEyeRadius + mIrisRadius - (int) (mGapFactor * mPupilRadius); 

// 侦听鼠标事件 
MouseMotion aMouseMotion = new MouseMotion(); 
this.addMouseMotionListener(aMouseMotion); 
this.setSize(400, 135); 
} 

public void paintFrame(Graphics g) { 
if (mErrorMessage != null) { 
showError(g); 
return; 
} 

// 背景面部 
g.drawImage(mFace, mFaceX, mFaceY, this); 

// 画外部的球体 
g.setColor(mIrisColor); 
g.fillOval(mLeftIrisX - mIrisRadius, mLeftIrisY - mIrisRadius, 2 * mIrisRadius, 
2 * mIrisRadius); 
g.fillOval(mRightIrisX - mIrisRadius, mRightIrisY - mIrisRadius, 2 * mIrisRadius, 
2 * mIrisRadius); 
// 画瞳孔 
g.setColor(mPupilColor); 
g.fillOval(mLeftPupilX - mPupilRadius, mLeftPupilY - mPupilRadius, 2 * mPupilRadius, 
2 * mPupilRadius); 
g.fillOval(mRightPupilX - mPupilRadius, mRightPupilY - mPupilRadius, 2 * mPupilRadius, 
2 * mPupilRadius); 

if (mTestMode) { 
g.drawOval(mLeftEyeX - mLeftEyeRadius, mLeftEyeY - mLeftEyeRadius, 2 * mLeftEyeRadius, 
2 * mLeftEyeRadius); 
g.drawOval(mRightEyeX - mRightEyeRadius, mRightEyeY - mRightEyeRadius, 
2 * mRightEyeRadius, 2 * mRightEyeRadius); 
} 
} 

public void mouseMoved() { 
// coordinates for the left iris 
int leftDX = mMouseX - mLeftEyeX; 
int leftDY = mMouseY - mLeftEyeY; 
if (leftDY == 0) 
leftDY = 1; // prevent divide by zero 
double leftDXDY = (double) leftDX / leftDY; 
double leftdy = Math.sqrt(Math.pow(mLeftEyeRadius, 2) / (Math.pow(leftDXDY, 2) + 1)); 
if (leftDY < 0) { 
leftdy = -leftdy; 
} 
double leftdx = leftDXDY * leftdy * mHorizontalSkew; 

// coordinates for the right iris 
int rightDX = mMouseX - mRightEyeX; 
int rightDY = mMouseY - mRightEyeY; 
if (rightDY == 0) 
rightDY = 1; // prevent divide by zero 
double rightDXDY = (double) rightDX / rightDY; 
double rightdy = Math.sqrt(Math.pow(mRightEyeRadius, 2) / (Math.pow(rightDXDY, 2) + 1)); 
if (rightDY < 0) { 
rightdy = -rightdy; 
} 
double rightdx = rightDXDY * rightdy * mHorizontalSkew; 

// adjustments for the irises 
double avedx = (rightdx + leftdx) / 2; 
double avedy = (rightdy + leftdy) / 2; 
leftdx = leftdx + (avedx - leftdx) * (1 - mEyeIndependence); 
rightdx = rightdx + (avedx - rightdx) * (1 - mEyeIndependence); 
leftdy = leftdy + (avedy - leftdy) * (1 - mEyeIndependence); 
rightdy = rightdy + (avedy - rightdy) * (1 - mEyeIndependence); 
// new iris positions 
mLeftIrisX = mLeftEyeX + (int) leftdx; 
mLeftIrisY = mLeftEyeY + (int) leftdy; 
mRightIrisX = mRightEyeX + (int) rightdx; 
mRightIrisY = mRightEyeY + (int) rightdy; 

// coordinates for the left pupil 
double leftpdy = Math.sqrt(Math.pow(mLeftPupilTR, 2) / (Math.pow(leftDXDY, 2) + 1)); 
if (leftDY < 0) { 
leftpdy = -leftpdy; 
} 
double leftpdx = leftDXDY * leftpdy * (mHorizontalSkew - mGapFactor); 

// coordinates for the right pupil 
double rightpdy = Math.sqrt(Math.pow(mRightPupilTR, 2) / (Math.pow(rightDXDY, 2) + 1)); 
if (rightDY < 0) { 
rightpdy = -rightpdy; 
} 
double rightpdx = rightDXDY * rightpdy * (mHorizontalSkew - mGapFactor); 

// adjustments for the pupils 
double avepdx = (rightpdx + leftpdx) / 2; 
double avepdy = (rightpdy + leftpdy) / 2; 
leftpdx = leftpdx + (avepdx - leftpdx) * (1 - mEyeIndependence); 
rightpdx = rightpdx + (avepdx - rightpdx) * (1 - mEyeIndependence); 
leftpdy = leftpdy + (avepdy - leftpdy) * (1 - mEyeIndependence); 
rightpdy = rightpdy + (avepdy - rightpdy) * (1 - mEyeIndependence); 

// new pupil positions 
mLeftPupilX = mLeftEyeX + (int) leftpdx; 
mLeftPupilY = mLeftEyeY + (int) leftpdy; 
mRightPupilX = mRightEyeX + (int) rightpdx; 
mRightPupilY = mRightEyeY + (int) rightpdy; 

repaint(); 
} 

public void update(Graphics g) { 
paint(g); 
} 

public void paint(Graphics g) { 
Dimension d = getSize(); 

// create the offscreen graphics context 
if ((mGraphics == null) || (d.width != mDimension.width) 
|| (d.height != mDimension.height)) { 
mDimension = d; 
mImage = createImage(d.width, d.height); 
mGraphics = mImage.getGraphics(); 
} 

// erase the previous image 
mGraphics.setColor(getBackground()); 
mGraphics.fillRect(0, 0, d.width, d.height); 
mGraphics.setColor(Color.black); 

// paint the frame into the image 
paintFrame(mGraphics); 

// paint the image onto the screen 
g.drawImage(mImage, 0, 0, null); 
} 

class MouseMotion extends java.awt.event.MouseMotionAdapter { 
public void mouseMoved(java.awt.event.MouseEvent event) { 
Object object = event.getSource(); 
if (object == Eye.this) 
mouseMovedInApplet(event); 
} 
} 

void mouseMovedInApplet(java.awt.event.MouseEvent event) { 
// get the mouse coords 
mMouseX = event.getX(); 
mMouseY = event.getY(); 
mouseMoved(); 
} 

public void mouseMovedInBrowser(int x, int y, int windowWidth) { 
int appletW = getSize().width; 

// adjust mouse x and y relative to applet position 
mMouseX = x - (windowWidth - appletW) / 2; 
mMouseY = y - mVerticalOffset; 
mouseMoved(); 
} 

private void showError(Graphics g) { 
g.setFont(new Font("TimesRoman", Font.BOLD, 12)); 
g.drawString(mErrorMessage, 10, 20); 
} 
} 

以上が本稿の内容ですので、皆様のご勉強に役立てていただければ幸いです。

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