3 files changed, 303 insertions, 0 deletions
diff --git a/qtjava/javalib/tutorial/t12/CannonField.java b/qtjava/javalib/tutorial/t12/CannonField.java
new file mode 100644
index 00000000..28077c15
--- /dev/null
+++ b/qtjava/javalib/tutorial/t12/CannonField.java
@@ -0,0 +1,173 @@
+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 QPoint target;
+	
+	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;
+		target = new QPoint(0, 0);
+		
+		setPalette(new QPalette(new QColor(250, 250, 200)));
+		newTarget();
+	}
+
+	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 newTarget() {
+		QRegion r = new QRegion(targetRect());
+		target = new QPoint((int) (200 + Math.random()*190),
+												(int) (10  + Math.random()*255));
+		repaint(r.unite(new QRegion(targetRect())));
+	}
+
+	public void moveShot() {
+		QRegion r = new QRegion(shotRect());
+		timerCount++;
+
+		QRect shotR = shotRect();
+		
+		if (shotR.intersects(targetRect())) {
+			autoShootTimer.stop();
+			emit("hit");
+		} else if (shotR.x() > width() || shotR.y() > height()) {
+			autoShootTimer.stop();
+			emit("missed");
+		} 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);
+		if (updateR.intersects(targetRect()))
+			paintTarget(p);
+	}
+
+	private void paintShot(QPainter p) {
+		p.setBrush(black());
+		p.setPen(NoPen);
+		p.drawRect(shotRect());
+	}
+
+	private void paintTarget(QPainter p) {
+		p.setBrush(red());
+		p.setPen(black());
+		p.drawRect(targetRect());
+	}
+	
+
+	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;
+	}
+
+	private QRect targetRect() {
+		QRect r = new QRect(0, 0, 20, 10);
+		r.moveCenter(new QPoint(target.x(),height() - 1 - target.y()));
+		return r;
+	}
+
+	public QSizePolicy sizePolicy() {
+		return new QSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding);
+	}
+}
diff --git a/qtjava/javalib/tutorial/t12/LCDRange.java b/qtjava/javalib/tutorial/t12/LCDRange.java
new file mode 100644
index 00000000..3211120b
--- /dev/null
+++ b/qtjava/javalib/tutorial/t12/LCDRange.java
@@ -0,0 +1,56 @@
+import org.kde.qt.*;
+
+public class LCDRange extends QVBox {
+	private QSlider slider;
+	private QLabel label;
+	
+	public LCDRange(QWidget parent, String name) {
+		super(parent, name);
+		init();
+	}
+	
+	public LCDRange(String s, QWidget parent, String name) {
+		super(parent, name);
+		init();
+		setText(s);
+	}
+
+	private void init() {
+		QLCDNumber lcd = new QLCDNumber(2, this, "lcd");
+		slider = new QSlider(Horizontal, this, "slider");
+		slider.setRange(0, 99);
+		slider.setValue(0);
+
+		label = new QLabel(" ", this, "label", 0);
+		label.setAlignment(AlignCenter);
+		
+		connect(slider, SIGNAL("valueChanged(int)"),
+						lcd, SLOT("display(int)"));
+		connect(slider, SIGNAL("valueChanged(int)"),
+						SIGNAL("valueChanged(int)"));
+
+		setFocusProxy(slider);
+	}
+
+	public int value() {
+		return slider.value();
+	}
+
+	public void setValue(int value) {
+		slider.setValue(value);
+	}
+
+	public void setRange(int minVal, int maxVal) {
+		if (minVal < 0 || maxVal > 99 || minVal > maxVal) {
+			qWarning("LCDRange::setRange("+minVal+","+maxVal+")\n"+
+							 "\tRange must be 0..99\n"+
+							 "\tand minVal must not be greater than maxVal");
+			return;
+		}
+		slider.setRange(minVal, maxVal);
+	}
+
+	public void setText(String s) {
+		label.setText(s);
+	}
+}
diff --git a/qtjava/javalib/tutorial/t12/Tut12.java b/qtjava/javalib/tutorial/t12/Tut12.java
new file mode 100644
index 00000000..eb0dc917
--- /dev/null
+++ b/qtjava/javalib/tutorial/t12/Tut12.java
@@ -0,0 +1,74 @@
+import org.kde.qt.*;
+
+public class Tut12 extends QWidget {
+	public Tut12() {
+		QPushButton quit = new QPushButton("&Quit", this, "quit");
+		quit.setFont(new QFont("Times", 18, QFont.Bold, false));
+
+		connect(quit, SIGNAL("clicked()"), qApp(), SLOT("quit()"));
+
+		LCDRange angle = new LCDRange("ANGLE", this, "angle");
+		angle.setRange(5, 70);
+
+		LCDRange force = new LCDRange("FORCE", this, "force");
+		force.setRange(10, 50);
+
+		CannonField cannonField = new CannonField(this, "cannonField");
+
+		connect(angle, SIGNAL("valueChanged(int)"),
+						cannonField, SLOT("setAngle(int)"));
+		connect(cannonField, SIGNAL("angleChanged(int)"),
+						angle, SLOT("setValue(int)"));
+
+		connect(force, SIGNAL("valueChanged(int)"),
+						cannonField, SLOT("setForce(int)"));
+		connect(cannonField, SIGNAL("forceChanged(int)"),
+						force, SLOT("setValue(int)"));
+
+
+		QPushButton shoot = new QPushButton("&Shoot", this, "shoot");
+		shoot.setFont(new QFont("Times", 18, QFont.Bold, false));
+
+		connect(shoot, SIGNAL("clicked()"), cannonField, SLOT("shoot()"));
+
+		QGridLayout grid = new QGridLayout(this, 2, 2, 10, -1, null);
+		grid.addWidget(quit, 0, 0);
+		grid.addWidget(cannonField, 1, 1);
+		grid.setColStretch(1, 10);
+
+		QVBoxLayout leftBox = new QVBoxLayout();
+		grid.addLayout(leftBox, 1, 0);
+		leftBox.addWidget(angle);
+		leftBox.addWidget(force);
+
+		QHBoxLayout topBox = new QHBoxLayout();
+		grid.addLayout(topBox, 0, 1);
+		topBox.addWidget(shoot);
+		topBox.addStretch(1);
+
+		angle.setValue(60);
+		force.setValue(25);
+		angle.setFocus();
+	}
+	
+	public static void main(String[] args) {
+		QApplication.setColorSpec(QApplication.CustomColor);
+		QApplication a = new QApplication(args);
+		Tut12 w = new Tut12();
+		w.setGeometry( 100, 100, 500, 355 );
+		
+		a.setMainWidget(w);
+		w.show();
+		a.exec();
+		return;
+	}
+	
+	static {
+		try {
+			Class c = Class.forName("org.kde.qt.qtjava");
+		} catch (Exception e) {
+			e.printStackTrace();
+			System.out.println("Can't load qtjava class");
+		}
+	}
+}