I am trying to color a box on a plot.

Question

Charlie 2024-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/2090886-i-am-trying-to-color-a-box-on-a-plot

评论： Charlie 2024-3-6

i have a box with text in it that moves along a line on a plot. i need there to be background color in the box under the text. Right now I can only get it to show on top of the text.

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Answer 1

Chunru 2024-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/2090886-i-am-trying-to-color-a-box-on-a-plot#answer_1421671

在 MATLAB Online 中打开

You can change the face color of the box:

square = rectangle('Position', [0, 0, 2.5, 15], 'EdgeColor','b','LineWidth',2,"FaceColor", "g");

You also need to change the order of box and text. MATLAB draw the object layer by layer. If you want to show text on top of box, you have to plot box first.

%% Header

% Written by C. Vogen

% Date Written:3/3/2024

% Modified: None

%% Variable Glossery

% t_start = 0; % seconds

% t_end = 10; % seconds

% x_final = 10; % meters

% y_final = 0; % meters

% g = 9.81 % m/s^2

% m = 150;

%

%% Code Statements

clear; clc; close all;

t_start = 0; % seconds

t_end = 10; % seconds

x_final = 10; % meters

y_final = 0; % meters

g = 9.81; % m/s^2

v_x0 = x_final/t_end; % finding initial x velocity

v_y0 = (y_final + (g*0.5*(t_end^2)))/t_end; % finding initial y velocity

m = 11;

T = zeros(m,2);

incrv = (t_end - t_start)/(m-1);

startCannon =[0,0]; endCannon = [.175,10]; % starts the cannon

Cannon = [startCannon;endCannon];

figure

plot(Cannon(:,1),Cannon(:,2),'LineWidth',5)

xlabel('x [m]');xlim([-1 13])

ylabel('y [m]');ylim([0 150])

hold on

pause(1)

Color_start = [.25 .25 .25];

Color_end = [1 1 0];

Color_incv = (Color_end - Color_start)/(m-1);

square = rectangle('Position', [0, 0, 2.5, 15], 'EdgeColor','b','LineWidth',2,"FaceColor", "g");

flag_text = text(0, 0, '', 'HorizontalAlignment', 'left','VerticalAlignment','bottom', 'FontWeight', 'bold');

for i = 1:m

t = t_start +(i-1)*incrv;

x = v_x0 * t;

y = (v_y0 * t) - ((g * t^2)/2);

Color = Color_start +(i-1)*Color_incv;

pause(0.4)

if i>1

delete(ball) % removing the previous marker

delete(line) % removes the line connecting the box to the point

end

ball = plot(x,y,'o','MarkerFaceColor','r'); % plotting inside the loop

set(ball, 'XData',x, 'YData',y)

set(flag_text, 'Position', [x+0.2, 30], 'String', {['X: ', num2str(x)], ['Y: ', num2str(y)],['I: ', num2str(i)],['T: ',num2str(t)]})

set(square, 'Position', [x, 25, 2.5, 38]);

line = plot([x,x],[0,30],'b','LineWidth',2);

axis normal

title('Visual Loop')

xlabel('x [m]');xlim([-1 13])

ylabel('y [m]');ylim([0 150])

grid on

end

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Charlie 2024-3-6

It worked! Thankyou very much for helping me

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Answer 2

Chunru 2024-3-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2090886-i-am-trying-to-color-a-box-on-a-plot#answer_1421616

在 MATLAB Online 中打开

Try the following

figure;
an = annotation("textbox", "Color", "r", "BackgroundColor", "g", "String", "Text Box");
for i=0:0.01:0.9
    an.Position= [i, 0.5, 0.1, 0.1];
    drawnow
end

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Charlie 2024-3-6

在 MATLAB Online 中打开

I'll just send the whole code

%% Header
% Written by C. Vogen
% Date Written:3/3/2024
% Modified: None
%% Variable Glossery
% t_start = 0; % seconds
% t_end = 10; % seconds
% x_final = 10; % meters
% y_final = 0; % meters
% g = 9.81 % m/s^2
% m = 150;
% 
%% Code Statements
clear; clc; close all;
t_start = 0; % seconds
t_end = 10; % seconds
x_final = 10; % meters
y_final = 0; % meters
g = 9.81; % m/s^2
v_x0 = x_final/t_end; % finding initial x velocity
v_y0 = (y_final + (g*0.5*(t_end^2)))/t_end; % finding initial y velocity
m = 11;
T = zeros(m,2);
incrv = (t_end - t_start)/(m-1);
startCannon =[0,0]; endCannon = [.175,10]; % starts the cannon
Cannon = [startCannon;endCannon]; 
figure
plot(Cannon(:,1),Cannon(:,2),'LineWidth',5)
xlabel('x [m]');xlim([-1 13])
ylabel('y [m]');ylim([0 150])
hold on
pause(1)
flag_text = text(0, 0, '', 'HorizontalAlignment', 'left','VerticalAlignment','bottom', 'FontWeight', 'bold');
Color_start = [.25 .25 .25];
Color_end = [1 1 0];
Color_incv = (Color_end - Color_start)/(m-1);
square = rectangle('Position', [0, 0, 2.5, 15], 'EdgeColor','b','LineWidth',2);
for i = 1:m
    t = t_start +(i-1)*incrv;
    x = v_x0 * t;
    y = (v_y0 * t) - ((g * t^2)/2);
    Color = Color_start +(i-1)*Color_incv;
    pause(0.4)
    if i>1
        delete(ball) % removing the previous marker
        delete(line) % removes the line connecting the box to the point
    end
    ball = plot(x,y,'o','MarkerFaceColor','r'); % plotting inside the loop
    set(ball, 'XData',x, 'YData',y)
    set(flag_text, 'Position', [x+0.2, 30], 'String', {['X: ', num2str(x)], ['Y: ', num2str(y)],['I: ', num2str(i)],['T: ',num2str(t)]})
    set(square, 'Position', [x, 25, 2.5, 38]);
    line = plot([x,x],[0,30],'b','LineWidth',2);
    axis normal
    title('Visual Loop')
    xlabel('x [m]');xlim([-1 13])
    ylabel('y [m]');ylim([0 150])
    grid on
    
end