Rotational Movement of an object

Question

Taimur Saleem 2013-11-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106604-rotational-movement-of-an-object

编辑： Taimur Saleem 2013-11-18

I wanted to know how I could work up a code for matlab which would make a rectangle rotate by say 5 degrees and then also make that rectangle move in a straight line at that same angle so it looks as if it moves in a straight line always but any increment to the angle would make it rotate slightly and change its velocity. I have written a code for applying increments and used 35 as an example but I dont know how to make the rectangle move in a straight line made at the angle 35. The code isnt complete though, its missing some increments for the left and right arrow keys but they can be added as well.

fig = figure;

axis equal

axis([0 100 0 100]);

set(fig, 'KeyPressFcn', 'a = get(gcf, ''CurrentCharacter'')');

a = 1;

r = 5;

x = 10;

y = 10;

dy = 5;

ball = rectangle('Position', [x+r y+r r r], 'FaceColor','r');

for i=1:100

pause;

if double(a) == 28 %left arrow

dx1a = x*cosd(35)-y*sind(35)

dx1b = x*sind(35)+y*cosd(35)

end

if double(a) == 29 %right arrow

        dx2a = x*cosd(35)-y*sind(35)
        dx2b = x*sind(35)+y*cosd(35)
    end
    if double(a) == 30 %up arrow
       y = y + dy;
    end
    if double(a) == 31 %down arrow
        y = y - dy;
    end     
    set(ball,'Position',[x+r y+r 5 5]);

end

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Answer 1

Doug Hull 2013-11-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/106604-rotational-movement-of-an-object#answer_115606

Relevant

A video using HGTransform to move an airplane around the screen. Similar techniques would apply.

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Taimur Saleem 2013-11-18

编辑：Taimur Saleem 2013-11-18

The principles might be the same but I am having trouble in the actual movement of the rectangle in the set path. The path I defined is the same at all angles which is a straight line but moving it in a straight line results in the object staying in the orientation. Also I want the angle to be an increment so that moving the arrow keys twice may increment the angle twice and then the forward arrow key moves it at that particular angle in a straight line. -->this part in particular is what I cant do.

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