need help to write a program to draw the rectangle decrived down below.

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Enrique Vitela
Enrique Vitela 2020-5-7
编辑： Ameer Hamza 2020-5-8
rect1.x = 30; % x-coordinate of the lower left corner
rect1.y = 30; % y-coordinate of the lower left corner
rect1.width = 500;
rect1.height= 400;
rect1.color = 'b';
% Rectangle 2
rect2.x = 350; % x-coordinate of the lower left corner
rect2.y = 300; % y-coordinate of the lower left corner
rect2.width = 220;
rect2.height= 250;
rect2.color = 'r';
% Rectangle 3
rect3.x = 300; % x-coordinate of the lower left corner
rect3.y = 250; % y-coordinate of the lower left corner
rect3.width = 150;
rect3.height= 400;
rect3.color = 'c';
rect1.x = 30; % x-coordinate of the lower left corner
rect1.y = 30; % y-coordinate of the lower left corner
rect1.width = 500;
rect1.height= 400;
rect1.color = 'b';
% Rectangle 2
rect2.x = 350; % x-coordinate of the lower left corner
rect2.y = 300; % y-coordinate of the lower left corner
rect2.width = 220;
rect2.height= 250;
rect2.color = 'r';
% Rectangle 3
rect3.x = 300; % x-coordinate of the lower left corner
rect3.y = 250; % y-coordinate of the lower left corner
rect3.width = 150;
rect3.height= 400;
rect3.color = 'c';

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-5-8
编辑：Ameer Hamza 2020-5-8
Always use an array instead of naming the variable like rect1, rect2, .... It makes the code much simpler. Following code draw rectangles using patches
rect(1).x = 30; % x-coordinate of the lower left corner
rect(1).y = 30; % y-coordinate of the lower left corner
rect(1).width = 500;
rect(1).height= 400;
rect(1).color = 'b';
% Rectangle 2
rect(2).x = 350; % x-coordinate of the lower left corner
rect(2).y = 300; % y-coordinate of the lower left corner
rect(2).width = 220;
rect(2).height= 250;
rect(2).color = 'r';
% Rectangle 3
rect(3).x = 300; % x-coordinate of the lower left corner
rect(3).y = 250; % y-coordinate of the lower left corner
rect(3).width = 150;
rect(3).height= 400;
rect(3).color = 'c';
figure;
axes();
hold on
for i=1:numel(rect)
r = rect(i);
rect_x = [r.x r.x+r.width r.x+r.width r.x];
rect_y = [r.y r.y r.y+r.height r.y+r.height];
patch(rect_x, rect_y, r.color);
end

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