Many problems with simple triangle game

Shadow1234567890 · 2002-09-02T06:43:05

I am trying to write another version of the cliche'd SPACE INVADERS. So far I have a simple class that simply draws a simple red triangle. Here are the problems that I have: When I press W and A the triangle moves up and to the left with no problem. When I press D and S the triangle disappears When I include a call to SwapBuffers(hDC) the screen flashes (hDC is a global device context, and yes I know global variables are bad). Here is the class declarations: class Spaceship { public: Spaceship(); void Move(float, float); private: float xPos; float yPos; }; //STARTING POINT FOR THE PLAYER IS DEFINED //STARTING POINT FOR THE ENEMY SHOULD BE RANDOM Spaceship::Spaceship(){ } void Spaceship::Move(float X, float Y) { glColor3f(1.0f, 0.0f, 0.0f); //RED TRIANGLE IS THE BODY OF THE SPACESHIP glBegin(GL_TRIANGLES); glVertex3f( (X + 1), Y, -1.0f);//BOTTOM- RIGHT VERTEX OF TRIANGLE glVertex3f( (X - 1), Y, -1.0f);//BOTTOM- LEFT VERTEX OF TRIANGLE glVertex3f( X, (Y + 1), -1.0f);//TOP VERTEX OF TRIANGLE glEnd(); } class Player : public Spaceship { public: Player(); private: float xPos; float yPos; }; Player::Player(){ xPos = 0; yPos = 0; } Here is the drawscene function that makes all the appropriate calls int DrawGLScene(float X, float Y) // Here's Where We Do All The Drawing { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer glLoadIdentity(); gluLookAt(0.0f, 0.0f, 10.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);// Reset The Current Modelview Matrix Player1->Move(X, Y); return TRUE; // Everything Went OK } I have been fiddling with this for quite some time now and I don't know what I am doing wrong, and I could really use the help. Thanks EDIT: Is it possible that some other part of the program could be causing the problems? i.e the Windows Procedure? EDIT SK: Just added some SOURCE tags to encase your code snippet. [edited by - Shadow1234567890 &#111n August 31, 2002 12:00:52 PM] [edited by - ShiningKnight &#111n August 31, 2002 12:42:15 PM]

Graphics and GPU Programming Programming

Started by Shadow1234567890 August 31, 2002 10:57 AM

10 comments, last by Shadow1234567890 21 years, 7 months ago

Anonymous

September 02, 2002 06:40 AM

I think the error is the "else" before the DrawGlScene: remove it

  		else								// Not Time To Quit, Update Screen				{					DrawGLScene(XPosition, YPosition);					// Draw The Scene					SwapBuffers(hDC);				// Swap Buffers (Double Buffering)				}			}

Check also the (keys[VK_?]) tests...

Anonymous

September 02, 2002 06:43 AM

I think the error is the "else" before the DrawGlScene: remove it

  else // Not Time To Quit, Update Screen{  DrawGLScene(XPosition, YPosition); // Draw The Scene  SwapBuffers(hDC); // Swap Buffers (Double Buffering)}

(damn tabs...

Check also the (keys[VK_?]) tests...

Many problems with simple triangle game

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Many problems with simple triangle game

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