process_input.c File Reference Converts mouse_drag messages into game moves or button presses. More... #include "white_interface.h" #include "e:\AndrewWorkspace\Stratego\input.h" Go to the source code of this file. Functions void  process_move (void)   Determines the starting and finishing board squares of a move. More... void  process_placing (void)   Determines the starting square in the placing panel and the finishing square on the main game board. More... void  process_button (void)   Works out which button the user clicked. More... int  calc_x_square (int x, int square_width)   Calculates the x value of the board square at the supplied screen coordinates. More... int  calc_y_square (int y, int square_height, int zero_pixel)   Calculates the y value of the board square at the supplied screen coordinates. More... void  poin_entry_Init ()   VCC Init function. More... void  poin_entry_Run ()   VCC Run function. More... Variables int  down_x int  down_y int  up_x int  up_y Detailed Description Converts mouse_drag messages into game moves or button presses. This block receives mouse_drag messages from the receive_input block, which tell it where the user has dragged the mouse on the screen. It reads these messages and decides what the user was inteding to do. For example, they may have been placing a piece on the game board, moving an existing piece from one square to another or clicking one of the buttons at the bottom of the screen. Messages are then send to the output_move or output_button blocks, which will send move or button messages to the game core. Definition in file process_input.c. Function Documentation int calc_x_square (  int    x, int    square_width )    Calculates the x value of the board square at the supplied screen coordinates. Parameters: x  The x screen coordinate for which you need the corresponding grid square number. square_width  The width of one board square (in screen pixels). Returns: an integer specifying the x value of the board square. Definition at line 235 of file process_input.c. Referenced by process_button, process_move, and process_placing. { return (x / square_width); } int calc_y_square (  int    y, int    square_height, int    zero_pixel )    Calculates the y value of the board square at the supplied screen coordinates. Parameters: y  The y screen coordinate for which you need the corresponding grid square number. square_height  The height of one board square (in screen pixels). zero_pixel  The y screen coordinate of the bottom edge of the row of squares with y value 0. Returns: an integer specifying the y value of the board square. Definition at line 241 of file process_input.c. Referenced by process_move, and process_placing. { int new_y; int square; /* first work out number of pixels above or below y=0 line (the bottom edge of the bottom row of main board squares). */ new_y = y - zero_pixel; /* now calculate the y value of the board square. */ square = new_y / square_height; /* this copes with calculating the correct negative y value for a square in the placing panel. */ if (new_y < 0 && new_y % square_height != 0) square = square - 1; return (square); } void poin_entry_Init (    )    VCC Init function. This function runs when the VCC simulation is first started. Definition at line 95 of file process_input.c. { } void poin_entry_Run (    )    VCC Run function. This runs whenever a message arrives at the process_input block's in port. Definition at line 103 of file process_input.c. References BOARD_PLACE_BOUNDARY, down_x, down_y, PLACE_BUTTONS_BOUNDARY, process_button, process_move, process_placing, SCREEN_HEIGHT, SCREEN_WIDTH, up_x, and up_y. { mouse_drag input; if (in_Enabled()) { input = *in_Value(); down_x = input.down_x; down_y = input.down_y; up_x = input.up_x; up_y = input.up_y; /* first check if click is on the screen horizontally */ if (down_x >= 0 && up_x >=0 && down_x < SCREEN_WIDTH && up_x < SCREEN_WIDTH) { /* If y coordinate is in main game board area, user is trying to make a move. */ if (down_y < SCREEN_HEIGHT && up_y < SCREEN_HEIGHT && down_y >= BOARD_PLACE_BOUNDARY && up_y >= BOARD_PLACE_BOUNDARY) { process_move(); } /* if y coordinate is in the placing panel, user is trying to place a piece. */ if (down_y < BOARD_PLACE_BOUNDARY && down_y >= PLACE_BUTTONS_BOUNDARY && up_y < SCREEN_HEIGHT && up_y >= BOARD_PLACE_BOUNDARY) { process_placing(); } /* if y coordinate is in the button area, user is trying to click a button. */ if (down_y < PLACE_BUTTONS_BOUNDARY && down_y >= 0 && up_y < PLACE_BUTTONS_BOUNDARY && up_y >= 0) { process_button(); } } } } void process_button (  void    )    Works out which button the user clicked. This takes the start and end coordinates of where the user clicked the mouse and works out which button they clicked. An integer specifying the number of the button is send to the output_button block. The mouse button must be pressed and released over the same button, otherwise the button click will be ignored. Definition at line 212 of file process_input.c. References BUTTONS_WIDTH, calc_x_square, down_x, NO_BUTTONS_X, and up_x. Referenced by poin_entry_Run. { int down_square, up_square; int button_width; /* calculate size of each square in pixels */ button_width = BUTTONS_WIDTH / NO_BUTTONS_X; /* work out which button the user clicked. */ down_square = calc_x_square(down_x, button_width); up_square = calc_x_square(up_x, button_width); /* If the user clicked 1 button rather than dragging the mouse between 2 buttons, output the button press */ if (down_square == up_square) button_out_Post(down_square + 1); } void process_move (  void    )    Determines the starting and finishing board squares of a move. process_move examines the start and end coordinates of where the user dragged the mouse and calculates the starting and finishing board squares. If the move is legal (i.e. between 2 different squares that fit on the screen) a temp_move message is sent to the output_move block. Otherwise the move is ignored. Definition at line 146 of file process_input.c. References BOARD_HEIGHT, BOARD_PLACE_BOUNDARY, BOARD_WIDTH, BOARD_X_SQUARES, BOARD_Y_SQUARES, calc_x_square, calc_y_square, down_x, down_y, up_x, and up_y. Referenced by poin_entry_Run. { int start_x_square, start_y_square, end_x_square, end_y_square; int square_width, square_height; temp_move move; /* calculate size of each square in pixels */ square_width = BOARD_WIDTH / BOARD_X_SQUARES; square_height = BOARD_HEIGHT / BOARD_Y_SQUARES; /* work out which squares the user clicked. Squares are numbered 0 to 9, left to right and bottom to top of the screen. */ start_x_square = calc_x_square(down_x, square_width); end_x_square = calc_x_square(up_x, square_width); start_y_square = calc_y_square(down_y, square_height, BOARD_PLACE_BOUNDARY); end_y_square = calc_y_square(up_y, square_height, BOARD_PLACE_BOUNDARY); /* if start and end square are different, send the move to the output_move block. */ if ((start_x_square != end_x_square) || (start_y_square != end_y_square)) { move.start_x = start_x_square; move.start_y = start_y_square; move.end_x = end_x_square; move.end_y = end_y_square; move_out_Post(&move); } } void process_placing (  void    )    Determines the starting square in the placing panel and the finishing square on the main game board. process_placing examines the start and end coordinates of where the user dragged the mouse and calculates the starting square on the placing panel and the finishing square on the main game board. A piece must be dragged from the placing panel to the main board. If it is dropped somewhere else on the placing panel or on a button the placing will be ignored. If the placing is legal, a temp_move message will be send to the output_move block. Note that the starting square y value is negative to indicate that it refers to a square on the placing panel. Definition at line 180 of file process_input.c. References BOARD_HEIGHT, BOARD_PLACE_BOUNDARY, BOARD_WIDTH, BOARD_X_SQUARES, BOARD_Y_SQUARES, calc_x_square, calc_y_square, down_x, down_y, PLACE_HEIGHT, PLACE_WIDTH, PLACE_X_SQUARES, PLACE_Y_SQUARES, up_x, and up_y. Referenced by poin_entry_Run. { int start_x_square, start_y_square, end_x_square, end_y_square; int board_square_width, board_square_height; int place_square_width, place_square_height; temp_move placing; /* calculate size of each square in pixels */ board_square_width = BOARD_WIDTH / BOARD_X_SQUARES; board_square_height = BOARD_HEIGHT / BOARD_Y_SQUARES; place_square_width = PLACE_WIDTH / PLACE_X_SQUARES; place_square_height = PLACE_HEIGHT / PLACE_Y_SQUARES; /* work out which squares the user clicked. */ start_x_square = calc_x_square(down_x, place_square_width); end_x_square = calc_x_square(up_x, board_square_width); start_y_square = calc_y_square(down_y, place_square_height, BOARD_PLACE_BOUNDARY); end_y_square = calc_y_square(up_y, board_square_height, BOARD_PLACE_BOUNDARY); /* output the move */ placing.start_x = start_x_square; placing.start_y = start_y_square; placing.end_x = end_x_square; placing.end_y = end_y_square; move_out_Post(&placing); } Variable Documentation int down_x   variables to store the x and y coordinates of where the mouse is clicked and released. Definition at line 86 of file process_input.c. Referenced by poin_entry_Run, process_button, process_move, and process_placing. int down_y   variables to store the x and y coordinates of where the mouse is clicked and released. Definition at line 86 of file process_input.c. Referenced by poin_entry_Run, process_move, and process_placing. int up_x   variables to store the x and y coordinates of where the mouse is clicked and released. Definition at line 86 of file process_input.c. Referenced by poin_entry_Run, process_button, process_move, and process_placing. int up_y   variables to store the x and y coordinates of where the mouse is clicked and released. Definition at line 86 of file process_input.c. Referenced by poin_entry_Run, process_move, and process_placing.
	Copyright © 2002 Andrew Bates Last Updated 03/04/02