BezierScrollerpublic class BezierScroller extends AnimatingControlsSurface | Animated Bezier Curve shape with images at the control points.
README.txt file scrolling up. Composited Image fading in and out. |
| Fields Summary |
|---|
| private static String[] | appletStrs | | private static final int | NUMPTS | | private static Color | greenBlend | | private static Font | font | | private static Color | blueBlend | | private static BasicStroke | bs | | private static Image | hotj_img | | private static BufferedImage | img | | private static final int | UP | | private static final int | DOWN | | private float[] | animpts | | private float[] | deltas | | private BufferedReader | reader | | private int | nStrs | | private int | strH | | private int | yy | | private int | ix | | private int | iy | | private int | imgX | | private Vector | vector | | private Vector | appletVector | | private float | alpha | | private int | alphaDirection | | protected boolean | doImage | | protected boolean | doShape | | protected boolean | doText | | protected boolean | buttonToggle |
| Constructors Summary |
|---|
public BezierScroller()
setBackground(Color.white);
doShape = doText = true;
hotj_img = getImage("HotJava-16.gif");
Image image = getImage("jumptojavastrip.png");
int iw = image.getWidth(this);
int ih = image.getHeight(this);
img = new BufferedImage(iw, ih, BufferedImage.TYPE_INT_RGB);
img.createGraphics().drawImage(image, 0, 0, this);
setControls(new Component[] { new DemoControls(this) });
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| Methods Summary |
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| public void | animate(float[] pts, float[] deltas, int index, int limit)
float newpt = pts[index] + deltas[index];
if (newpt <= 0) {
newpt = -newpt;
deltas[index] = (float) (Math.random() * 4.0 + 2.0);
} else if (newpt >= (float) limit) {
newpt = 2.0f * limit - newpt;
deltas[index] = - (float) (Math.random() * 4.0 + 2.0);
}
pts[index] = newpt;
| | public void | getFile()
try {
String fName = "README.txt";
if ((reader = new BufferedReader(new FileReader(fName))) != null) {
getLine();
}
} catch (Exception e) { reader = null; }
if (reader == null) {
appletVector = new Vector(100);
for (int i = 0; i < 100; i++) {
appletVector.addElement(appletStrs[i%appletStrs.length]);
}
getLine();
}
buttonToggle = true;
| | public java.lang.String | getLine()
String str = null;
if (reader != null) {
try {
if ((str = reader.readLine()) != null) {
if (str.length() == 0) {
str = " ";
}
vector.addElement(str);
}
} catch (Exception e) { e.printStackTrace(); reader = null; }
} else {
if (appletVector.size() != 0) {
vector.addElement(str = (String) appletVector.remove(0));
}
}
return str;
| | public static void | main(java.lang.String[] argv)
createDemoFrame(new BezierScroller());
| | public void | render(int w, int h, java.awt.Graphics2D g2)
if (doText) {
g2.setColor(Color.lightGray);
g2.setFont(font);
float y = yy;
for (int i = 0; i < vector.size(); i++) {
g2.drawString((String)vector.get(i), 1, y += strH);
}
}
if (doShape) {
float[] ctrlpts = animpts;
int len = ctrlpts.length;
float prevx = ctrlpts[len - 2];
float prevy = ctrlpts[len - 1];
float curx = ctrlpts[0];
float cury = ctrlpts[1];
float midx = (curx + prevx) / 2.0f;
float midy = (cury + prevy) / 2.0f;
GeneralPath gp = new GeneralPath(GeneralPath.WIND_NON_ZERO);
gp.moveTo(midx, midy);
for (int i = 2; i <= ctrlpts.length; i += 2) {
float x1 = (midx + curx) / 2.0f;
float y1 = (midy + cury) / 2.0f;
prevx = curx;
prevy = cury;
if (i < ctrlpts.length) {
curx = ctrlpts[i + 0];
cury = ctrlpts[i + 1];
} else {
curx = ctrlpts[0];
cury = ctrlpts[1];
}
midx = (curx + prevx) / 2.0f;
midy = (cury + prevy) / 2.0f;
float x2 = (prevx + midx) / 2.0f;
float y2 = (prevy + midy) / 2.0f;
gp.curveTo(x1, y1, x2, y2, midx, midy);
}
gp.closePath();
g2.setColor(blueBlend);
g2.setStroke(bs);
g2.draw(gp);
g2.setColor(greenBlend);
g2.fill(gp);
PathIterator pi = gp.getPathIterator(null);
float pts[] = new float[6];
while ( !pi.isDone() ) {
if (pi.currentSegment(pts) == pi.SEG_CUBICTO) {
g2.drawImage(hotj_img, (int) pts[0], (int) pts[1], this);
}
pi.next();
}
}
if (doImage) {
AlphaComposite ac = AlphaComposite.getInstance(
AlphaComposite.SRC_OVER, alpha);
g2.setComposite(ac);
g2.drawImage(img.getSubimage(imgX,0,80,80), ix, iy, this);
}
| | public void | reset(int w, int h)
for (int i = 0; i < animpts.length; i += 2) {
animpts[i + 0] = (float) (Math.random() * w);
animpts[i + 1] = (float) (Math.random() * h);
deltas[i + 0] = (float) (Math.random() * 6.0 + 4.0);
deltas[i + 1] = (float) (Math.random() * 6.0 + 4.0);
if (animpts[i + 0] > w / 2.0f) {
deltas[i + 0] = -deltas[i + 0];
}
if (animpts[i + 1] > h / 2.0f) {
deltas[i + 1] = -deltas[i + 1];
}
}
FontMetrics fm = getFontMetrics(font);
strH = fm.getAscent()+fm.getDescent();
nStrs = h/strH+2;
vector = new Vector(nStrs);
ix = (int) (Math.random() * (w - 80));
iy = (int) (Math.random() * (h - 80));
| | public void | step(int w, int h)
if (doText && vector.size() == 0) {
getFile();
}
if (doText) {
String s = getLine();
if (s == null || vector.size() == nStrs && vector.size() != 0) {
vector.removeElementAt(0);
}
yy = (s == null) ? 0 : h - vector.size() * strH;
}
for (int i = 0; i < animpts.length && doShape; i += 2) {
animate(animpts, deltas, i + 0, w);
animate(animpts, deltas, i + 1, h);
}
if (doImage && alphaDirection == UP) {
if ((alpha += 0.025) > .99) {
alphaDirection = DOWN;
alpha = 1.0f;
}
} else if (doImage && alphaDirection == DOWN) {
if ((alpha -= .02) < 0.01) {
alphaDirection = UP;
alpha = 0;
ix = (int) (Math.random() * (w - 80));
iy = (int) (Math.random() * (h - 80));
}
}
if (doImage) {
if ((imgX += 80) == 800) {
imgX = 0;
}
}
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