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Awesome job so far everyone! Please give us your feedback on how our article efforts are going. We still need more finished articles for our May contest theme: Remake the Classics

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#ActualBeerNutts

Posted 10 January 2013 - 04:32 PM

Phil, what did you not understand about this code I posted?

 
</p><div>struct TBrick {</div>
<div>  int XPosition;</div>
<div>  int YPosition;</div>
<div>  int XSize;</div>
<div>  int YSize;</div>
<div>  uint32_t Color;</div>
<div>  uint32_t ActiveState;  // 0 is deactive; If it takes multiple hits to kill a brick, it can start greater than 1</div>
<div>};</div>
<div> </div>
<div>struct TBall {</div>
<div>  int XPosition;</div>
<div>  int YPosition;</div>
<div>  int XSize;</div>
<div>  int YSize;</div>
<div>  int XSpeed;</div>
<div>  int YSpeed;</div>
<div>};</div>
<div> </div>
<div>#define BRICK_COLUMNS 20 // how many bricks in a column</div>
<div>#define BRICK_ROWS 10 // how many bricks ina  row</div>
<div>#define BRICK_START_X 60 // Where the bricks start on the x-axis</div>
<div>#define BRICK_START_Y 40 // Where the bricks start on the y-axis</div>
<div>#define BRICK_WIDTH 30 // brick width in pixels</div>
<div>#define BRICK_HEIGHT 15 // brickheight in pixels</div>
<div> </div>
<div>// make this a global array</div>
<div>TBrick BrickArray[BRICK_COLUMNS][BRICK_ROWS];</div>
<div> </div>
<div>// Initialize the Brick Array somewhere at the start of your code</div>
<div>for (int x = 0; x < BRICK_COLUMNS; x++) {</div>
<div>  for (int y = 0; y < BRICK_ROWS; y++) {</div>
<div>    BrickArray[x][y].XSize = BRICK_WIDTH;</div>
<div>    BrickArray[x][y].YSize = BRICK_HEIGHT;</div>
<div>    BrickArray[x][y].XLocation = BRICK_START_X + x*BRICK_WIDTH;</div>
<div>    BrickArray[x][y].YLocation = BRICK_START_Y + y*BRICK_HEIGHT;</div>
<div>    BrickArray[x][y].Color = 0xFFFFFFFF; // white</div>
<div>    BrickArray[x][y].ActiveState = 1; // 1 hit to turn off brick</div>
<div>  }</div>
<div>}</div>
<div>  </div>
<div>// in main loop do this:</div>
<div>// move Ball in X direction, then check collision</div>
<div>Ball.XLocation += Ball.XSpeed;</div>
<div>if (CheckCollision(Ball)) {</div>
<div>  // The ball hit something, move to original location and negate X speed</div>
<div>  Ball.XLocation -= Ball.XSpeed;</div>
<div>  Ball.XSpeed = -Ball.XSpeed;</div>
<div>}</div>
<div> </div>
<div>// Do same for Y movement</div>
<div>Ball.YLocation += Ball.YSpeed;</div>
<div>if (CheckCollision(Ball)) {</div>
<div>  // The ball hit something, move to original location and negate Y speed</div>
<div>  Ball.YLocation -= Ball.YSpeed;</div>
<div>  Ball.YSpeed = -Ball.YSpeed;</div>
<div>}</div>
<div> </div>
<div>RenderBricks();</div>
<div> </div>
<div>... // the rest of the main loop</div>
<div> </div>
<div> </div>
<div>// Here are those functions</div>
<div>bool CheckCollisions(TBall ball)</div>
<div>{</div>
<div>  // loop through every brick and see if we've hit it</div>
<div>  for (int x = 0; x < BRICK_COLUMNS; x++) {</div>
<div>    for (int y = 0; y < BRICK_ROWS; y++) {</div>
<div>     // Only check against bricks that are active</div>
<div>     if (BrickArray[x][y].ActiveState > 0) {</div>
<div>      if (ball.XLocation + ball.XSize < BrickArray[x][y].XLocation ||</div>
<div>          ball.YLocation  + ball.YSize < BrickArray[x][y].YLocation ||</div>
<div>          ball.XLocation > BrickArray[x][y].XLocation + BrickArray[x][y].XSize ||</div>
<div>          ball.YLocation  < BrickArray[x][y].YLocation + BrickArray[x][y].YSize) {</div>
<div>        // It's collided wit brick, decrment Active state of brick and return true</div>
<div>        BrickArray[x][y].ActiveState--;</div>
<div>        return true;</div>
<div>      }</div>
<div>    }</div>
<div>  }</div>
<div> </div>
<div>  // Check if we've hit the paddle and </div>
<div>  // Check if we've hit the wall (I'll leave this up to you)</div>
<div>}</div>
<div> </div>
<div>// This Draws the bricks</div>
<div>void RenderBricks()</div>
<div>{</div>
<div>  // loop through every brick and draw if active</div>
<div>  for (int x = 0; x < BRICK_COLUMNS; x++) {</div>
<div>    for (int y = 0; y < BRICK_ROWS; y++) {</div>
<div>     if (BrickArray[x][y].ActiveState > 0) {</div>
<div>       // Call you GL draw function, whatever it is.  it would be simple to do in SFML however</div>
<div>       GlDrawRect(BrickArray[x][y].XLocation, BrickArray[x][y].YLocation,</div>
<div>                           BrickArray[x][y].XSize, BrickArray[x][y].YSize, BrickArray[x][y].Color);</div>
<div>     }</div>
<div>   }</div>
<div>  }</div>
<div>}</div>
<div>

It gives a general idea of how to encapsulate brick's and the ball into it's own structure, and shows how to handle collisions and rendering.

#1BeerNutts

Posted 10 January 2013 - 03:49 PM

Phil, what did you not understand about this code I posted?

[code=auto:0]

struct TBrick {
  int XPosition;
  int YPosition;
  int XSize;
  int YSize;
  uint32_t Color;
  uint32_t ActiveState;  // 0 is deactive; If it takes multiple hits to kill a brick, it can start greater than 1
};
 
struct TBall {
  int XPosition;
  int YPosition;
  int XSize;
  int YSize;
  int XSpeed;
  int YSpeed;
};
 
#define BRICK_COLUMNS 20 // how many bricks in a column
#define BRICK_ROWS 10 // how many bricks ina  row
#define BRICK_START_X 60 // Where the bricks start on the x-axis
#define BRICK_START_Y 40 // Where the bricks start on the y-axis
#define BRICK_WIDTH 30 // brick width in pixels
#define BRICK_HEIGHT 15 // brickheight in pixels
 
// make this a global array
TBrick BrickArray[BRICK_COLUMNS][BRICK_ROWS];
 
// Initialize the Brick Array somewhere at the start of your code
for (int x = 0; x < BRICK_COLUMNS; x++) {
  for (int y = 0; y < BRICK_ROWS; y++) {
    BrickArray[x][y].XSize = BRICK_WIDTH;
    BrickArray[x][y].YSize = BRICK_HEIGHT;
    BrickArray[x][y].XLocation = BRICK_START_X + x*BRICK_WIDTH;
    BrickArray[x][y].YLocation = BRICK_START_Y + y*BRICK_HEIGHT;
    BrickArray[x][y].Color = 0xFFFFFFFF; // white
    BrickArray[x][y].ActiveState = 1; // 1 hit to turn off brick
  
// in main loop do this:
// move Ball in X direction, then check collision
Ball.XLocation += Ball.XSpeed;
if (CheckCollision(Ball)) {
  // The ball hit something, move to original location and negate X speed
  Ball.XLocation -= Ball.XSpeed;
  Ball.XSpeed = -Ball.XSpeed;
}
 
// Do same for Y movement
Ball.YLocation += Ball.YSpeed;
if (CheckCollision(Ball)) {
  // The ball hit something, move to original location and negate Y speed
  Ball.YLocation -= Ball.YSpeed;
  Ball.YSpeed = -Ball.YSpeed;
}
 
RenderBricks();

... // the rest of the main loop


// Here are those functions
bool CheckCollisions(TBall ball)
{
  // loop through every brick and see if we've hit it
  for (int x = 0; x < BRICK_COLUMNS; x++) {
    for (int y = 0; y < BRICK_ROWS; y++) {
     // Only check against bricks that are active
     if (BrickArray[x][y].ActiveState > 0) {
      if (ball.XLocation + ball.XSize < BrickArray[x][y].XLocation ||
          ball.YLocation  + ball.YSize < BrickArray[x][y].YLocation ||
          ball.XLocation > BrickArray[x][y].XLocation + BrickArray[x][y].XSize ||
          ball.YLocation  < BrickArray[x][y].YLocation + BrickArray[x][y].YSize) {
        // It's collided wit brick, decrment Active state of brick and return true
        BrickArray[x][y].ActiveState--;
        return true;
      }
    }
  }
 
  // Check if we've hit the paddle and 
  // Check if we've hit the wall (I'll leave this up to you)
}
 
// This Draws the bricks
void RenderBricks()
{
  // loop through every brick and draw if active
  for (int x = 0; x < BRICK_COLUMNS; x++) {
    for (int y = 0; y < BRICK_ROWS; y++) {
     if (BrickArray[x][y].ActiveState > 0) {
       // Call you GL draw function, whatever it is.  it would be simple to do in SFML however
       GlDrawRect(BrickArray[x][y].XLocation, BrickArray[x][y].YLocation,
                           BrickArray[x][y].XSize, BrickArray[x][y].YSize, BrickArray[x][y].Color);
     }
   }
  }[/code]

It gives a general idea of how to encapsulate brick's and the ball into it's own structure, and shows how to handle collisions and rendering.

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Show differencesHistory of post edits

#ActualBeerNutts

#1BeerNutts

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