chapter 2 example 6

chapter02/Example6/include/Resources.h

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+#pragma once
+#include "cinder/CinderResources.h"
+#include "Resources.h"
+
+//#define RES_MY_RES			CINDER_RESOURCE( ../resources/, image_name.png, 128, IMAGE )

chapter02/Example6/src/Example6App.cpp

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+#include "cinder/app/AppBasic.h"
+#include "cinder/gl/gl.h"
+#include "cinder/Rand.h"
+#include "Attractor.h"
+#include "Mover.h"
+
+
+using namespace ci;
+using namespace ci::app;
+using namespace std;
+
+class Example6App : public AppBasic {
+  public:
+	void setup();
+	void update();
+	void draw();
+    void prepareSettings(Settings *settings);
+
+    MoverRef mMover;
+    AttractorRef mAttractor;
+};
+
+void Example6App::prepareSettings(Settings *settings) {
+    settings->setFullScreen();
+}
+
+void Example6App::setup()
+{
+    mMover = MoverRef(new Mover());
+    mAttractor = AttractorRef(new Attractor());
+}
+
+void Example6App::update()
+{
+    Vec2f force = mAttractor->attract(mMover);
+    mMover->applyForce(force);
+    mMover->update();
+}
+
+void Example6App::draw()
+{
+	gl::clear( Color( 1, 1, 1 ) );
+
+    mAttractor->draw();
+    mMover->draw();
+}
+
+CINDER_APP_BASIC( Example6App, RendererGl )

chapter02/Example6/xcode/Attractor.cpp

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+/*
+ *  Attractor.cpp
+ *  Example6
+ *
+ *  Created by Nathan Koch on 1/4/13
+ *  Copyright 2013 __MyCompanyName__. All rights reserved.
+ *
+ */
+
+// header files
+#include "cinder/app/AppBasic.h"
+#include "cinder/CinderMath.h"
+#include "Mover.h"
+#include "Attractor.h"
+
+// namespaces
+using namespace ci;
+
+
+Attractor::Attractor( ) {
+	mLocation = (Vec2f)app::getWindowCenter();
+    mMass = 20.0f;
+    mG = 0.4f;
+}
+
+
+void Attractor::draw( ) {
+    gl::color(0.68, 0.68, 0.68);
+    gl::drawSolidCircle(mLocation, mMass*2);
+    gl::color(0, 0, 0);
+    gl::drawStrokedCircle(mLocation, mMass*2);
+}
+
+Vec2f Attractor::attract(MoverRef m) {
+    Vec2f force = mLocation - m->mLocation;
+    float distance = force.length();
+    distance = math<float>::clamp(distance, 5.0f, 25.0f);
+    float strength = (mG * mMass * mMass) / ( distance * distance );
+    force.safeNormalize();
+    force *= strength;
+    return force;
+}

chapter02/Example6/xcode/Attractor.h

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+/*
+ *  Attractor.h
+ *  Example6
+ *
+ *  Created by Nathan Koch on 1/4/13
+ *  Copyright 2013 __MyCompanyName__. All rights reserved.
+ *
+ */
+#include "Mover.h"
+#pragma once
+
+typedef std::shared_ptr<class Attractor> AttractorRef;
+class Attractor {
+
+  public:
+
+	Attractor();
+
+	void draw();
+    ci::Vec2f attract(MoverRef m);
+
+    float mMass;
+    float mG;
+    ci::Vec2f mLocation;
+};