如何使用箭头键更改某物的值? [英] How can I change the value of something using the arrow keys?

问题描述

我创建了一个d = 20值.我希望每次按右箭头键时d增加10，而每次按左箭头键时减小10.因此，如果我按一次右箭头键，则按d = 30，如果我再次按右箭头键，则按d = 40.然后，如果我按向左箭头键，则按d = 30.

I have created a value of d = 20. I would like d to increase by 10 every time I press the right arrow key and decrease every time I hit the left arrow key. So If I pressed the right arrow key once then d = 30, and if I pressed the right arrow key again then d = 40. And then if I pressed the left arrow key then d = 30.

我应该使用WindowPressKeyFcn吗?

推荐答案

d = 20;

f = figure;
k=1;
while k
    waitforbuttonpress;
    if get(gcf,'CurrentCharacter')==28     % Detection for left key
        d=d-10
    elseif get(gcf,'CurrentCharacter')==29 % Detection for right key
        d=d+10

    elseif get(gcf,'CurrentCharacter')==32
        k=0;   % Stop execution if Spacebar is pressed
    end
end
close(f)   %Closing the figure window

这将打开一个图形窗口.按 → 或 ← 键分别将值增加或减少10.如果按 空格键 ，执行将停止.

This will open a figure window. Press → or ← keys to increase or decrease the value by 10 respectively. The execution will stop if you press Spacebar .

PS::您的图形窗口应始终位于焦点上.

P.S: Your figure window should always be on focus.

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