Plot function for two moving points with different velocities

Question

Yashashwani xxx 2017-11-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/368441-plot-function-for-two-moving-points-with-different-velocities

回答： Image Analyst 2017-11-21

I have the following code but it gives an error undefined function or variable 'x'. Can anyone please help me in this? plot(x, y, 'b');

car = line([], [], 'MarkerSize', 10, 'Color', 'r');

carx = x(1); cary = y(1);

numxy = length(x);

aimidx = 2;

numv = length(v);

vidx = 0;

speed = 0;

while true

    if speed <= 0
      carm = 'x';
      set(car, 'XData', carx, 'YData', cary, 'Marker', carm);
      drawnow;
      if vidx >= numv || aimidx > numxy
        break;  %done following path
      end
      vidx = vidx + 1;
      speed = v(vidx);
      continue;
    end
    deltax = x(aimidx) - carx;
    deltay = y(aimidx) - cary;
    aimdist = sqrt(deltax.^2 + deltay.^2);
    if aimdist <= speed
      carx = x(aimidx);
      cary = y(aimidx);
      aimidx = aimidx + 1;
      speed = 0;  %flag to draw current point and move to next v
      continue;
    end
    carx = carx + speed * deltax ./ aimdist;
    cary = cary + speed * deltay ./ aimdist;
    if abs(deltax) >= abs(deltay)
      if deltax > 0
        carm = '>';
      else
        carm = '<';
      end
    elseif deltay > 0
      carm = '^';
    else
      carm = 'v';
    end
    set(car, 'XData', carx, 'YData', cary, 'Marker', carm);
    drawnow;