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import org.kde.qt.*;
public class CannonField extends QWidget {
private int ang;
private int f;
private int timerCount;
private QTimer autoShootTimer;
private float shoot_ang;
private float shoot_f;
private final QRect barrelRect = new QRect(33, -4, 15, 8);
public CannonField(QWidget parent, String name) {
super(parent, name);
ang = 45;
f = 0;
timerCount = 0;
autoShootTimer = new QTimer(this, "movement handler");
connect(autoShootTimer, SIGNAL("timeout()"),
this, SLOT("moveShot()"));
shoot_ang = 0;
shoot_f = 0;
setPalette(new QPalette(new QColor(250, 250, 200)));
}
public int angle() {
return ang;
}
public void setAngle(int degrees) {
if (degrees < 5)
degrees = 5;
if (degrees > 70)
degrees = 70;
if (ang == degrees)
return;
ang = degrees;
repaint();
emit("angleChanged", ang);
}
public int force() {
return f;
}
public void setForce(int newton) {
if (newton < 0)
newton = 0;
if (f == newton)
return;
f = newton;
emit("forceChanged", f);
}
public void shoot() {
if (autoShootTimer.isActive())
return;
timerCount = 0;
shoot_ang = ang;
shoot_f = f;
autoShootTimer.start(50);
}
public void moveShot() {
QRegion r = new QRegion(shotRect());
timerCount++;
QRect shotR = shotRect();
if (shotR.x() > width() || shotR.y() > height())
autoShootTimer.stop();
else
r = r.unite(new QRegion(shotR));
repaint(r);
}
public void paintEvent(QPaintEvent e) {
QRect updateR = e.rect();
QPainter p = new QPainter(this);
if (updateR.intersects(cannonRect()))
paintCannon(p);
if (autoShootTimer.isActive() && updateR.intersects(shotRect()))
paintShot(p);
}
private void paintShot(QPainter p) {
p.setBrush(black());
p.setPen(NoPen);
p.drawRect(shotRect());
}
private void paintCannon(QPainter p) {
QRect cr = cannonRect();
QPixmap pix = new QPixmap(cr.size());
pix.fill(new QColor(250, 250, 200));
QPainter tmp = new QPainter(pix);
tmp.setBrush(blue());
tmp.setPen(NoPen);
tmp.translate(0, pix.height() - 1);
tmp.drawPie(new QRect(-35,-35, 70, 70), 0, 90*16);
tmp.rotate(-ang);
tmp.drawRect(barrelRect);
tmp.end();
p.drawPixmap(cr.topLeft(), pix);
}
private QRect cannonRect() {
QRect r = new QRect(0, 0, 50, 50);
r.moveBottomLeft(rect().bottomLeft());
return r;
}
private QRect shotRect() {
final double gravity = 4;
double time = timerCount / 4.0;
double velocity = shoot_f;
double radians = shoot_ang*3.14159265/180;
double velx = velocity*Math.cos(radians);
double vely = velocity*Math.sin(radians);
double x0 = (barrelRect.right() + 5)*Math.cos(radians);
double y0 = (barrelRect.right() + 5)*Math.sin(radians);
double x = x0 + velx*time;
double y = y0 + vely*time - 0.5*gravity*time*time;
QRect r = new QRect(0, 0, 6, 6);
r.moveCenter(new QPoint((int) x, height() - 1 - (int) y));
return r;
}
public QSizePolicy sizePolicy() {
return new QSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding);
}
}
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