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Hey everyone I just recently learned the mechanics of AABB collision detection. I have a problem where it seems to be that my collision detection function doesn't seem to detect the thing it was designed to (with the help of a friend).
I expect a true for no collision and a false for a collision, I think this is true?
This is where I use the function:Code:#include "vector2.h" bool collision2d(vector2 a_min, vector2 a_max, vector2 b_min, vector2 b_max) { return (a_min.x <= b_max.x) && (a_min.y <= b_max.y) && (a_max.x >= b_min.x) && (a_max.y >= b_min.y);}
This is my paddle class:Code:#include "Paddle.h" #include "Ball.h" #include "Collision2d.h" #include "vector2.h" Paddle paddle1, paddle2; Ball ball; class Mechanics { public: void move_paddle(vector2 direction, Paddle & gamePaddle){gamePaddle.location += direction;} void check_and_set_ball(Ball & gameBall, Paddle & gamePaddle) { if (collision2d(gameBall.d_min, gameBall.d_max, gamePaddle.d_min, gamePaddle.d_max)) { ball.location += moveRight; } else{ball.location += moveLeft;} } };
And this is my ballCode:#include "vector2.h" class Paddle { public: vector2 location; vector2 d_min; vector2 d_max; Paddle() { location.x = 10; location.y = 0; d_min.x = -1; d_min.y = -5; d_max.x = 1; d_max.y = 5; } const vector2 & get_position() const { return location; } void draw(vector2 vec) { glPushMatrix(); glTranslatef(vec.x,vec.y,-100.0f); glBegin(GL_QUADS); // Start Drawing Quads glVertex3f( d_min.x, d_min.y, 1.0f); // Bottom Left Of The Texture and Quad glVertex3f( d_max.x, d_min.y, 1.0f); // Bottom Right Of The Texture and Quad glVertex3f( d_max.x, d_max.y, 1.0f); // Top Right Of The Texture and Quad glVertex3f( d_min.x, d_max.y, 1.0f); // Top Left Of The Texture and Quad glEnd(); glPopMatrix(); } };
When I compile and run my app the ball seems to go straight through the paddle and on it's merry way off into the depths of virtual reality.Code:#include "vector2.h" class Ball { public: vector2 location; vector2 d_min; vector2 d_max; Ball() { location.x = 0; location.y = 0; d_min.x = -1; d_min.y = -1; d_max.x = 1; d_max.y = 1; } void draw(vector2 vec) { glPushMatrix(); glTranslatef(vec.x,vec.y,-50.0f); glBegin(GL_QUADS); // Start Drawing Quads glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom Left Of The Texture and Quad glVertex3f( 1.0f, -1.0f, 1.0f); // Bottom Right Of The Texture and Quad glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Texture and Quad glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Texture and Quad glEnd(); glPopMatrix(); } };
BTW I'm performing the check right here:
Any pointers in the right direction would be appreciatedCode:while(!done) // Loop That Runs While done=FALSE { if (PeekMessage(&msg,NULL,0,0,PM_REMOVE)) // Is There A Message Waiting? { if (msg.message==WM_QUIT) // Have We Received A Quit Message? { done=TRUE; // If So done=TRUE } else // If Not, Deal With Window Messages { TranslateMessage(&msg); // Translate The Message DispatchMessage(&msg); // Dispatch The Message } } else // If There Are No Messages { // Draw The Scene. Watch For ESC Key And Quit Messages From DrawGLScene() if (active) // Program Active? { if (keys[VK_ESCAPE]) // Was ESC Pressed? { done=TRUE; // ESC Signalled A Quit } else // Not Time To Quit, Update Screen { game.check_and_set_ball(ball, paddle1); DrawGLScene(); // Draw The Scene SwapBuffers(hDC); // Swap Buffers (Double Buffering) } } if (keys[VK_F1]) // Is F1 Being Pressed? { keys[VK_F1]=FALSE; // If So Make Key FALSE KillGLWindow(); // Kill Our Current Window fullscreen=!fullscreen; // Toggle Fullscreen / Windowed Mode // Recreate Our OpenGL Window if (!CreateGLWindow("NeHe's OpenGL Framework",640,480,16,fullscreen)) { return 0; // Quit If Window Was Not Created } } if (keys[VK_UP]){game.move_paddle(moveUp, paddle1);} if (keys[VK_DOWN]){game.move_paddle(moveDown, paddle1);} if (keys[VK_LEFT]){game.move_paddle(moveLeft, paddle1);} if (keys[VK_RIGHT]){game.move_paddle(moveRight, paddle1);} } }
