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Problems moving a bitmap sprite

Sir_Spritely · 2002-02-06T09:41:08

Hey, Okay I am basically working on a breakout clone, I have hit a brick wall with the paddle and gettting it to move. The paddle is loaded on the surface but the code I am using to move it aint working. I think I am not pointing it right or missing something off but after trying all day a whole host of methods I have to seek help - and learn at the same time Here''s the main bits of the code to implement the paddle, // defines for the actual bat or paddle #define PADDLE_START_X (SCREEN_WIDTH/2 - 16) #define PADDLE_START_Y (SCREEN_HEIGHT - 32) #define PADDLE_WIDTH 20 BITMAP_IMAGE paddle[1]; int paddle_x = 0, paddle_y = 0; // tracks the paddle pos void Paddle_Move(void) { if (KEY_DOWN(VK_RIGHT)) { // move the paddle to the right paddle_x+=8; // Make sure paddle doesn''t run off the screen if (paddle_x > (SCREEN_WIDTH - PADDLE_WIDTH)) paddle_x = SCREEN_WIDTH - PADDLE_WIDTH; } // end if else if (KEY_DOWN(VK_LEFT)) { // move paddle to right if (paddle_x < 0) paddle_x = 0; } // end if } // Paddle_Move() //load in the paddle Load_Bitmap_File(&bitmap8bit, "PADDLE.BMP"); for (index=0; index < 1; index++) { Create_Bitmap(&paddle[index],0,0,32,32); Load_Image_Bitmap(&paddle[index],&bitmap8bit,index,0,BITMAP_EXTRACT_MODE_CELL); } Unload_Bitmap_File(&bitmap8bit); for (index = 0; index<1; index++) { int paddle1 = rand()%1; paddle[paddle1].x = PADDLE_START_X; paddle[paddle1].y = PADDLE_START_Y; Draw_Bitmap(&paddle[paddle1],reactor.buffer, reactor.width,1); } // return success return(1); Then in Game_Main() I call the Paddle_Move function. I think I need to put the Bitmap_Image name into the Paddle_Move() function some how. Help really appreciated. Pk

General and Gameplay Programming Programming

Started by Sir_Spritely February 05, 2002 01:06 PM

9 comments, last by Sir_Spritely 22 years, 2 months ago

zipless

122

February 06, 2002 09:41 AM

Use the debug mode to break the program whenever the left key is pressed. Now once thats been done check to see what the value of paddle_x is BEFORE it''s altered, it should be zeor on the first run. Now ste through the rest of the if statement and make sure it''s working OK.

Now let the program run again and press left again, whats the value of paddle_x this time? If it''s zero again then it''s being reset outside the function and you need to find where it''s being set to zero.

If it''s not step the program down to the draw bitmap function and make sure that paddle[0].x is non zero.

zipless

/* Ignorance is bliss, then you go and spoil it by learning stuff */

/* Ignorance is bliss, then you go and spoil it by learning stuff */

Problems moving a bitmap sprite

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