matlab绘制一个二维的地图，上面设置6-8个圆形或椭圆形的障碍物，并保存为.png图片

可以使用MATLAB中的saveas函数将绘制的地图保存为.png图片。以下是一个示例代码：

% 定义障碍物的位置和大小
obstacle1_center = [2, 2];
obstacle1_radii = [0.5, 1];

obstacle2_center = [4, 6];
obstacle2_radii = [1, 0.5];

obstacle3_center = [8, 4];
obstacle3_radii = [1.5, 1];

% 绘制地图和障碍物
figure;
hold on;
axis equal;
grid on;

% 绘制圆形障碍物
theta = linspace(0, 2*pi, 100);
obstacle1_x = obstacle1_center(1) + obstacle1_radii(1) * cos(theta);
obstacle1_y = obstacle1_center(2) + obstacle1_radii(1) * sin(theta);
plot(obstacle1_x, obstacle1_y, 'r', 'LineWidth', 2);

obstacle2_x = obstacle2_center(1) + obstacle2_radii(1) * cos(theta);
obstacle2_y = obstacle2_center(2) + obstacle2_radii(1) * sin(theta);
plot(obstacle2_x, obstacle2_y, 'r', 'LineWidth', 2);

obstacle3_x = obstacle3_center(1) + obstacle3_radii(1) * cos(theta);
obstacle3_y = obstacle3_center(2) + obstacle3_radii(1) * sin(theta);
plot(obstacle3_x, obstacle3_y, 'r', 'LineWidth', 2);

% 绘制椭圆形障碍物
obstacle2_ellipse_x = obstacle2_center(1) + obstacle2_radii(2) * cos(theta);
obstacle2_ellipse_y = obstacle2_center(2) + obstacle2_radii(2) * sin(theta);
obstacle2_rotation = pi/4; % 旋转角度
R = [cos(obstacle2_rotation) sin(obstacle2_rotation); -sin(obstacle2_rotation) cos(obstacle2_rotation)];
obstacle2_ellipse = R * [obstacle2_ellipse_x; obstacle2_ellipse_y];
plot(obstacle2_ellipse(1,:), obstacle2_ellipse(2,:), 'r', 'LineWidth', 2);

obstacle3_ellipse_x = obstacle3_center(1) + obstacle3_radii(2) * cos(theta);
obstacle3_ellipse_y = obstacle3_center(2) + obstacle3_radii(2) * sin(theta);
obstacle3_rotation = pi/6; % 旋转角度
R = [cos(obstacle3_rotation) sin(obstacle3_rotation); -sin(obstacle3_rotation) cos(obstacle3_rotation)];
obstacle3_ellipse = R * [obstacle3_ellipse_x; obstacle3_ellipse_y];
plot(obstacle3_ellipse(1,:), obstacle3_ellipse(2,:), 'r', 'LineWidth', 2);

% 绘制地图边界
map_boundary_x = [0, 0, 10, 10, 0];
map_boundary_y = [0, 8, 8, 0, 0];
plot(map_boundary_x, map_boundary_y, 'k', 'LineWidth', 2);

% 添加标题和标签
title('Map with Obstacles');
xlabel('x');
ylabel('y');

% 保存为.png图片
saveas(gcf, 'map.png');

在这个示例代码中，我们绘制了地图和障碍物，并使用saveas函数将其保存为map.png图片。你可以根据需要修改障碍物的位置和大小，以及地图的边界，并将其保存为你想要的图片格式。