Make the joint draggable

example/src/ofApp.h

@@ -4,6 +4,8 @@
 #include "ofMain.h"
 #include "ofxPiMapper.h"
 
+#include "ofxCircleJoint.h"
+
 class ofApp : public ofBaseApp
 {
 public: 
@@ -18,6 +20,8 @@ public:
     
     ofxTriangleSurface triangleSurface;
     ofImage image;
+    
+    ofxCircleJoint joint;
 };
 
 #endif

src/ofxBaseJoint.cpp

@@ -2,14 +2,74 @@
 
 ofxBaseJoint::ofxBaseJoint()
 {
+    setDefaultColors();
+    setDefaultProperties();
+    registerAppEvents();
     registerMouseEvents();
 }
 
 ofxBaseJoint::~ofxBaseJoint()
 {
+    unregisterAppEvents();
     unregisterMouseEvents();
 }
 
+void ofxBaseJoint::mousePressed(ofMouseEventArgs &args)
+{
+    if ( hitTest(ofVec2f(args.x, args.y)) ) {
+        clickDistance = position - ofVec2f(args.x, args.y);
+        startDrag();
+    }
+}
+
+void ofxBaseJoint::mouseReleased(ofMouseEventArgs &args)
+{
+    stopDrag();
+}
+
+void ofxBaseJoint::mouseDragged(ofMouseEventArgs &args)
+{
+    if ( !dragging ) return;
+    position = ofVec2f(args.x, args.y) + clickDistance;
+}
+
+void ofxBaseJoint::startDrag()
+{
+    dragging = true;
+}
+
+void ofxBaseJoint::stopDrag()
+{
+    dragging = false;
+}
+
+void ofxBaseJoint::setDefaultColors()
+{
+    fillColor = ofColor(0,255,255);
+    strokeColor = ofColor(255,255,255);
+}
+
+void ofxBaseJoint::setDefaultProperties()
+{
+    enabled = true;
+    visible = true;
+    position = ofVec2f(20.0f, 20.0f);
+    clickDistance = ofVec2f(0.0f, 0.0f);
+    dragging = false;
+}
+
+void ofxBaseJoint::registerAppEvents()
+{
+    ofAddListener(ofEvents().update, this, &ofxBaseJoint::update);
+    ofAddListener(ofEvents().draw, this, &ofxBaseJoint::draw);
+}
+
+void ofxBaseJoint::unregisterAppEvents()
+{
+    ofRemoveListener(ofEvents().update, this, &ofxBaseJoint::update);
+    ofRemoveListener(ofEvents().draw, this, &ofxBaseJoint::draw);
+}
+
 void ofxBaseJoint::registerMouseEvents()
 {
     ofAddListener(ofEvents().mousePressed, this, &ofxBaseJoint::mousePressed);

src/ofxBaseJoint.h

@@ -8,12 +8,33 @@ public:
     ofxBaseJoint();
     ~ofxBaseJoint();
     
+    bool enabled;
+    bool visible;
+    
+    void mousePressed(ofMouseEventArgs& args);
+    void mouseReleased(ofMouseEventArgs& args);
+    void mouseDragged(ofMouseEventArgs& args);
+    void startDrag();
+    void stopDrag();
+    
+    virtual void update(ofEventArgs& args){};
+    virtual void draw(ofEventArgs& args){};
+    virtual bool hitTest(ofVec2f position){};
+    
+protected:
+    ofColor fillColor;
+    ofColor strokeColor;
+    ofVec2f position;
+    ofVec2f clickDistance;
+    bool dragging;
+    
+private:
+    void setDefaultColors();
+    void setDefaultProperties();
+    void registerAppEvents();
+    void unregisterAppEvents();
     void registerMouseEvents();
     void unregisterMouseEvents();
-    
-    virtual void mousePressed(ofMouseEventArgs& args){};
-    virtual void mouseReleased(ofMouseEventArgs& args){};
-    virtual void mouseDragged(ofMouseEventArgs& args){};
 };
 
 #endif

src/ofxCircleJoint.cpp

@@ -1,16 +1,38 @@
 #include "ofxCircleJoint.h"
 
-void ofxCircleJoint::mousePressed(ofMouseEventArgs &args)
+ofxCircleJoint::ofxCircleJoint()
 {
-    cout << "mouse pressed" << endl;
+    setDefaultProperties();
 }
 
-void ofxCircleJoint::mouseReleased(ofMouseEventArgs &args)
+void ofxCircleJoint::update(ofEventArgs& args)
 {
-    cout << "mouse released" << endl;
+    if (!enabled) return;
 }
 
-void ofxCircleJoint::mouseDragged(ofMouseEventArgs &args)
+void ofxCircleJoint::draw(ofEventArgs& args)
 {
-    cout << "mouse dragged" << endl;
+    if (!visible) return;
+    if (!enabled) return;
+    
+    ofPushStyle();
+    ofFill();
+    ofSetColor(fillColor);
+    ofCircle(position.x, position.y, radius);
+    ofNoFill();
+    ofSetColor(strokeColor);
+    ofCircle(position.x, position.y, radius);
+    ofPopStyle();
+}
+
+void ofxCircleJoint::setDefaultProperties()
+{
+    radius = 10.0f;
+}
+
+bool ofxCircleJoint::hitTest(ofVec2f pos)
+{
+    float distance = position.distance(pos);
+    if ( distance < radius ) return true;
+    else return false;
 }

src/ofxCircleJoint.h

@@ -7,9 +7,16 @@
 class ofxCircleJoint : public ofxBaseJoint
 {
 public:
-    void mousePressed(ofMouseEventArgs& args);
+    ofxCircleJoint();
-    void mouseReleased(ofMouseEventArgs& args);
+    
-    void mouseDragged(ofMouseEventArgs& args);
+    void update(ofEventArgs& args);
+    void draw(ofEventArgs& args);
+    bool hitTest(ofVec2f position);
+    
+private:
+    float radius;
+    
+    void setDefaultProperties();
 };
 
 #endif