在Matlab的GUI上用鼠标绘图 [英] Drawing with mouse on the GUI in matlab

问题描述

我想在带有GUI的matlab中有一个程序，在运行该程序时，用户可以在GUI的轴上用鼠标绘制任何东西，并且我想将创建的图像保存在矩阵中.我该怎么做?

I want to have a program in matlab with GUI, at run the program, user can draw anythings with mouse on the axes in GUI, and i want to saving created image in a matrix. how can i to do this?

推荐答案

最后，我找到了一个不错的代码，并且我更改了一些用于自定义的部分.通过这种方式，用户可以使用鼠标在轴上绘制任何内容:

Finally i find a good code and i have changed some parts for customizing for me. with this way, user can drawing anythings in the axes with mouse :

function userDraw(handles)
%F=figure;
%setptr(F,'eraser'); %a custom cursor just for fun

A=handles.axesUserDraw; % axesUserDraw is tag of my axes
set(A,'buttondownfcn',@start_pencil)

function start_pencil(src,eventdata)
coords=get(src,'currentpoint'); %since this is the axes callback, src=gca
x=coords(1,1,1);
y=coords(1,2,1);

r=line(x, y, 'color', [0 .5 1], 'LineWidth', 2, 'hittest', 'off'); %turning     hittset off allows you to draw new lines that start on top of an existing line.
set(gcf,'windowbuttonmotionfcn',{@continue_pencil,r})
set(gcf,'windowbuttonupfcn',@done_pencil)

function continue_pencil(src,eventdata,r)
%Note: src is now the figure handle, not the axes, so we need to use gca.
coords=get(gca,'currentpoint'); %this updates every time i move the mouse
x=coords(1,1,1);
y=coords(1,2,1);
%get the line's existing coordinates and append the new ones.
lastx=get(r,'xdata');  
lasty=get(r,'ydata');
newx=[lastx x];
newy=[lasty y];
set(r,'xdata',newx,'ydata',newy);

function done_pencil(src,evendata)
%all this funciton does is turn the motion function off 
set(gcf,'windowbuttonmotionfcn','')
set(gcf,'windowbuttonupfcn','')

这篇关于在Matlab的GUI上用鼠标绘图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！