how to get keyboard input to move things ?

Hi ppl,

I want to get keyboard input so that i can move my player to that location. the code i wrote is not moving the ball. here is the code, can any body tell what is the error in my code.

function [ ball ] = move( ball )
%MOVE Summary of this function goes here
%   Detailed explanation goes here
set(ball.fig, 'KeyPressFcn', 'a = get(gcf, ''CurrentCharacter'')');
a = 1;

      if double(a) == 28  %left arrow
          ball.manMid(1) = ball.manMid(1) - 5;

      elseif double(a) == 29 %right arrow
          ball.manMid(1) = ball.manMid(1) + 5;
      end

      set(ball.man,'Position',[ball.manMid, 2*ball.manRad 2*ball.manRad]);

end

and also i want my player to fire when spacebar is pressed, how can i do that.

Thank You :)

Answer 1

[Daniel Shub]

Graphics objects are not automatically refreshed. You might need to use drawnow.

doc drawnow

[Owais]

I didn't get you, can you write the code please ??

[Daniel Shub]

I am pretty confident I could write the code, but that really isn't the point of Answers.

Answer 2

[Jan]

The code is very unclear. Where is this function called from? It is not a callback, which is triggered by pressing a key. Setting the KeyPressFcn inside the function is unexpected. Then it is strange, that the callback function assigns a in the base-workspace. This is not directly accessible from inside the function.

a = 1;
if double(a) == 28

This is confusing also. Do you expect, that the callback function for KeyPress modifies a and restarts the function in the if double(a) == 28 line?

Currently it is hard to improve your function, because it can only be guessed, what you want to achieve. I suggest to use your favorite search engine to look for other KeyPressFcn examples in the net.