Ball.cpp

00001 #include "Ball.h"
00002 
00003 Ball::Ball() : vSpeed()
00004 {   // constructor
00005 }
00006 
00007 Ball::Ball(LCD_ST7735* pDisp) : vSpeed()
00008 {   // constructor
00009     this->pDisp=pDisp;
00010     this->fActive=false;
00011 }
00012 
00013 uint16_t Ball::dimmedColor(uint16_t uColor)
00014 {
00015     uint16_t r, g, b;
00016    
00017     r=(uColor >> 11) <<3;
00018     g=((uColor >> 5) & 0x3F) <<2;
00019     b=(uColor & 0x1F) << 3;
00020     r=r*2/3;
00021     g=g*2/3;
00022     b=b*2/3;
00023 
00024     return(Color565::fromRGB((uint16_t)r,(uint16_t)g,(uint16_t)b));
00025 }
00026 
00027 void Ball::initialize(int nX, int nY, int nR, uint16_t uColor)
00028 {
00029     this->pos.set(nX, nY);
00030     this->nRadius=nR;
00031     this->uColor=uColor;
00032     this->uColorHigh=uColor;
00033     this->uColorMid=dimmedColor(uColorHigh);
00034     this->uColorLow=dimmedColor(uColorMid);
00035 
00036 }
00037 
00038 void Ball::setSpeed(int X, int Y)
00039 {
00040     this->vSpeed.set(X, Y);
00041 }
00042 
00043 void Ball::changeSpeed(bool fUp)
00044 {
00045     if(fUp)
00046     {
00047         if(this->vSpeed.getSize()<=4.0) this->vSpeed.add(1.0);
00048     }
00049     else
00050     {
00051         if(this->vSpeed.getSize()>=1.0)
00052             this->vSpeed.add(-1.0);
00053         else        // TODO: added code below to allow zero speed pause of ball
00054             this->vSpeed.set(0,0);
00055     }
00056 }
00057 
00058 void Ball::unmove()
00059 {   // move back to previous position
00060     pos.set(pos.getPrev());
00061 }
00062 
00063 void Ball::update()
00064 {
00065     this->pos.move(this->vSpeed);
00066 }
00067 
00068 Circle Ball::getBoundingCircle()
00069 {
00070     return(Circle(this->pos.getX(), this->pos.getY(), this->nRadius));
00071 }
00072 
00073 bool Ball::collides(Rectangle r)
00074 {
00075     Circle cBall=this->getBoundingCircle();
00076     Rectangle rBall=cBall.getBoundingRectangle();
00077 
00078 /*    
00079 char szBuffer[256];
00080 sprintf(szBuffer, "c:%d,%d      ", cBall.getX(), cBall.getY());
00081 this->pDisp->drawString(font_oem, 0, 0, szBuffer);
00082 */
00083     return(rBall.collides(r));
00084 }
00085 
00086 bool Ball::collides(Circle cObject)
00087 {
00088     Circle cBall=this->getBoundingCircle();
00089     Rectangle rBall=cBall.getBoundingRectangle();
00090     Rectangle rObject=cObject.getBoundingRectangle();
00091 
00092     return(rBall.collides(rObject));
00093 }
00094 
00095 
00096 bool Ball::collides(Line ln)
00097 {
00098     Circle cBall=this->getBoundingCircle();
00099     return(cBall.collides(ln));
00100 }
00101 
00102 void Ball::Bounce(Vector vBounce)
00103 {   // change the direction in a certain direction
00104     this->unmove(); // undo move to pre-bouncing position to avoid drawing on colliding position
00105 
00106     this->vSpeed.multiply(vBounce);
00107 
00108     // check speed w/max
00109     if(this->vSpeed.y>5.0) this->vSpeed.y=5;
00110     if(this->vSpeed.x>5.0) this->vSpeed.x=5;
00111     if(this->vSpeed.y<-5.0) this->vSpeed.y=-5;
00112     if(this->vSpeed.x<-5.0) this->vSpeed.x=-5;
00113 }
00114 
00115 void Ball::BounceAgainst(Vector vBounce)
00116 {   // change the direction in a certain direction
00117     this->unmove(); // undo move to pre-bouncing position to avoid drawing on colliding position
00118 
00119     //this->vSpeed.multiply(vBounce);
00120     this->vSpeed.bounce(vBounce);
00121 
00122     // check speed w/max
00123     if(this->vSpeed.y>5.0) this->vSpeed.y=5;
00124     if(this->vSpeed.x>5.0) this->vSpeed.x=5;
00125     if(this->vSpeed.y<-5.0) this->vSpeed.y=-5;
00126     if(this->vSpeed.x<-5.0) this->vSpeed.x=-5;
00127 
00128 //    if(abs(vSpeed.x)>abs(vSpeed.y))
00129 //        vSpeed.x=vSpeed.x/abs(vSpeed.x) * abs(vSpeed.y);
00130 }
00131 
00132 
00133 
00134 void Ball::clear()
00135 {
00136     Point p=pos.getCur();
00137     this->pDisp->fillCircle(p.getX(),p.getY(), this->nRadius, Color565::Black, Color565::Black);
00138 }
00139 
00140 void Ball::clearPrev()
00141 {
00142     Point p=pos.getPrev();
00143     this->pDisp->fillCircle(p.getX(),p.getY(), this->nRadius, Color565::Black, Color565::Black);
00144 }
00145 
00146 
00147 void Ball::draw()
00148 {   // render the object on the screen, based on its current position
00149     Point p=pos.getCur();
00150     if(this->nRadius>3)
00151     {
00152         this->pDisp->fillCircle(p.getX(), p.getY(), this->nRadius, this->uColorLow, this->uColorLow);
00153         this->pDisp->fillCircle(p.getX()-this->nRadius/3, p.getY()-this->nRadius/3, this->nRadius/2, this->uColorMid, this->uColorMid);
00154         this->pDisp->setPixel(p.getX()-this->nRadius/2, p.getY()-this->nRadius/2, this->uColorHigh);
00155     }
00156     else
00157         this->pDisp->fillCircle(p.getX(), p.getY(), this->nRadius, this->uColorMid, this->uColorMid);
00158 }
00159 
00160 void Ball::redraw()
00161 {   // redraw the ball if its position has changed
00162     if(pos.hasChanged())
00163     {
00164         clearPrev();
00165         draw();
00166     }
00167 }