Tut 10

CMakeLists.txt

@@ -19,6 +19,7 @@ set(PROJECT_SOURCES
         tower.h tower.cpp
         game.h game.cpp
         res.qrc
+        bullet.h bullet.cpp
 )
 
 if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)

bullet.cpp

@@ -0,0 +1,20 @@
+#include "bullet.h"
+#include <QTimer>
+#include <qmath.h>
+
+Bullet::Bullet(QGraphicsItem *parent) {
+   // set graphics
+    setPixmap(QPixmap(":/images/missile.png"));
+    QTimer *move_timer = new QTimer(this);
+    connect(move_timer, SIGNAL(timeout()), this, SLOT(move()));
+    move_timer->start(50);
+}
+
+void Bullet::move() {
+    int STEP_SIZE = 30;
+    int theta = rotation(); // degrees
+    double dy = STEP_SIZE * qSin(qDegreesToRadians(theta));
+    double dx = STEP_SIZE * qCos(qDegreesToRadians(theta));
+
+    setPos(x()+dx, y()+dy);
+}

bullet.h

@@ -0,0 +1,14 @@
+#ifndef BULLET_H
+#define BULLET_H
+#include <QGraphicsPixmapItem>
+#include <QObject>
+
+class Bullet: public QObject, public QGraphicsPixmapItem {
+    Q_OBJECT
+public:
+    Bullet(QGraphicsItem *parent=0);
+public slots:
+    void move();
+};
+
+#endif // BULLET_H

game.cpp

@@ -1,10 +1,11 @@
 #include "game.h"
 #include <QGraphicsScene>
 #include "tower.h"
+#include "bullet.h"
 
 Game::Game() {
     scene = new QGraphicsScene(this);
-
+    scene->setSceneRect(0,0,800,600);
     setScene(scene);
 
     // create a tower
@@ -14,4 +15,14 @@ Game::Game() {
     scene->addItem(t);
 
     setFixedSize(800,600);
+    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+}
+
+void Game::mousePressEvent(QMouseEvent *event) {
+    // create a bullet
+    Bullet *bullet = new Bullet();
+    bullet->setPos(event->pos());
+    bullet->setRotation(40);
+    scene->addItem(bullet);
 }

game.h

@@ -2,11 +2,13 @@
 #define GAME_H
 
 #include <QGraphicsView>
+#include <QMouseEvent>
 
 class Game : public QGraphicsView
 {
 public:
     Game();
+    void mousePressEvent(QMouseEvent *event);
     QGraphicsScene *scene;
 };
 

res.qrc

@@ -1,5 +1,7 @@
 <RCC>
     <qresource prefix="/images">
         <file>tower.png</file>
+        <file>missile.png</file>
     </qresource>
+    <qresource prefix="/"/>
 </RCC>