Maxint R&D / Mbed 2 deprecated RETRO_BallAndHoles

Retro game that let's the player steer a ball through a hole filled maze. Has multiple levels of increasing difficulty.

Dependencies:   LCD_ST7735 MusicEngine RETRO_BallsAndThings mbed

Ball and Holes

In this game I attempted to create somewhat natural movement of the ball by implementing gravity and friction which combined over time determine the speed of the ball. Playing with the settings (aka. the magic numbers) that are spread out all over game.cpp, gives different effects, such as an icy, rough or liquid-like surface.

It took some time to figure out how to post my very first youtube video. Sorry for the shaky recording. Trying to record the video with my phone while playing the game in one hand was quite challenging, but here it is;

The left and right buttons are used to cheat: restart the current or go to the next level. Up and down control the game-tick. During game-play the robot-button shows the accelerator graph and the ship-button mutes the sound.

BTW. If your ball happens to get stuck, tilting the console in the opposite direction will set it free. For sake of argument: these magnetic wall-ends are in the words of Bob Ross "a happy accident". Since there is no specific code for it, others might call it a bug. As it results in more interesting game-play, I didn't attempt to fix it, but left a comment for those who dare to look at the mess I call code.

Ball.cpp

Committer:
maxint
Date:
2015-02-03
Revision:
2:d4de5a5866fe
Parent:
1:c1ee4c699517

File content as of revision 2:d4de5a5866fe:

#include "Ball.h"

Ball::Ball() : vSpeed()
{   // constructor
}

Ball::Ball(LCD_ST7735* pDisp) : vSpeed()
{   // constructor
    this->pDisp=pDisp;
    this->fActive=false;
}

uint16_t Ball::dimmedColor(uint16_t uColor)
{
    uint16_t r, g, b;
   
    r=(uColor >> 11) <<3;
    g=((uColor >> 5) & 0x3F) <<2;
    b=(uColor & 0x1F) << 3;
    r=r*2/3;
    g=g*2/3;
    b=b*2/3;
//    r=r/2;
//    g=g/2;
//    b=b/2;

    return(Color565::fromRGB((uint16_t)r,(uint16_t)g,(uint16_t)b));
}

void Ball::initialize(int nX, int nY, int nR, uint16_t uColor)
{
    this->pos.set(nX, nY);
    this->nRadius=nR;
    this->uColor=uColor;
    this->uColorHigh=uColor;
    this->uColorMid=dimmedColor(uColorHigh);
    this->uColorLow=dimmedColor(uColorMid);

}

void Ball::setSpeed(int X, int Y)
{
    this->vSpeed.set(X, Y);
}

void Ball::changeSpeed(bool fUp)
{
    if(fUp)
    {
        if(this->vSpeed.getSize()<=4.0) this->vSpeed.add(1.0);
    }
    else
    {
        if(this->vSpeed.getSize()>=1.0)
            this->vSpeed.add(-1.0);
        else        // TODO: added code below to allow zero speed pause of ball
            this->vSpeed.set(0,0);
    }
}

void Ball::unmove()
{   // move back to previous position
    pos.set(pos.getPrev());
}

void Ball::update()
{
    this->pos.move(this->vSpeed);
}

Circle Ball::getBoundingCircle()
{
    return(Circle(this->pos.getX(), this->pos.getY(), this->nRadius));
}

bool Ball::collides(Rectangle r)
{
    Circle cBall=this->getBoundingCircle();
    Rectangle rBall=cBall.getBoundingRectangle();

/*    
char szBuffer[256];
sprintf(szBuffer, "c:%d,%d      ", cBall.getX(), cBall.getY());
this->pDisp->drawString(font_oem, 0, 0, szBuffer);
*/
    return(rBall.collides(r));
}

void Ball::Bounce(Vector vBounce)
{   // change the direction in a certain direction
    this->unmove(); // undo move to pre-bouncing position to avoid drawing on colliding position

    this->vSpeed.multiply(vBounce);

    // check speed w/max
    if(this->vSpeed.y>5.0) this->vSpeed.y=5;
}



void Ball::clear()
{
    Point p=pos.getCur();
    this->pDisp->fillCircle(p.getX(),p.getY(), this->nRadius, Color565::Black, Color565::Black);
}

void Ball::clearPrev()
{
    Point p=pos.getPrev();
    this->pDisp->fillCircle(p.getX(),p.getY(), this->nRadius, Color565::Black, Color565::Black);
}


void Ball::draw()
{   // render the object on the screen, based on its current position
    Point p=pos.getCur();
    if(this->nRadius>3)
    {
        this->pDisp->fillCircle(p.getX(), p.getY(), this->nRadius, this->uColorLow, this->uColorLow);
        this->pDisp->fillCircle(p.getX()-this->nRadius/3, p.getY()-this->nRadius/3, this->nRadius/2, this->uColorMid, this->uColorMid);
        this->pDisp->setPixel(p.getX()-this->nRadius/2, p.getY()-this->nRadius/2, this->uColorHigh);
    }
    else
        this->pDisp->fillCircle(p.getX(), p.getY(), this->nRadius, this->uColorMid, this->uColorMid);
}

void Ball::redraw()
{   // redraw the ball if its position has changed
    if(pos.hasChanged())
    {
        clearPrev();
        draw();
    }
}