2023年12月11日发(作者：)

matlab清除轴,matlab–在现有轴内显示新图像,无需删除颜色条

我正在开发一个GUI,通过创建几个

axes以及每个的隐形

colorbar进行初始化(这样做是为了使轴保持其预定义的

Position)

1.存储所有轴和颜色条的手柄.

与UI的交互可能导致在任何一个轴上绘制图像.我希望通过适当地设置所有颜色条的可见属性,只在任何给定时间显示活动轴的颜色条.

我遇到了这种方法的问题,因为我使用imagesc来更新我的轴,这会删除与轴关联的任何颜色条,使存储的句柄无效.

我的问题是：如何在不删除颜色条的情况下使用imagesc或image来更新与颜色条关联的轴？

以下是重现此问题的方法：

dbclear in newplot %// Needed for the code to be properly re-runnable

%// Create an example figure containing a colorbar:

figure(); imagesc(imread('')); colorbar;

%// "Refreshing" the displayed image:

uiwait(msgbox('The image will now be refreshed. A breakpoint will be set in newplot.m'));

dbstop in newplot at 124 %// The line responsible for deleting the colorbar in R2015A/B

imagesc(imread(''));

newplot.m中设置断点的行读取：

cla(ax, 'reset', hsave);

这是(un)令人惊讶的一种未记录的方式来调用cla(带有3个参数)来保留在hsave中找到句柄的对象.

我假设使用彩条删除的一些想法是不可避免的(如果找不到“理智”的解决方案,我会追求这种想法)：

>将DeleteFcn绑定到将其数据保存到某个结构的颜色条.在imagesc完成后创建一个新的颜色条,然后迭代结构的字段并将所有属性分配给新

的颜色条对象.

>使用findall(hFig,’type’,’colorbar’)检查所有颜色条中的“偶尔”,或者验证每个轴是否具有有效的ColorbarPeerHandle,如下面的

附录所示.如果无效,重新创建CB.

>当不同的轴变为活动状态时删除所有颜色条,并仅创建我想要显示的CB.

附录 – ColorBar / Axes关联：

>处理与某个轴相关的颜色条hAx可以使用以下方式获得(在hg2中)：

hCb = getappdata(hAx,'ColorbarPeerHandle');

>处理与颜色条对象关联的轴hCb可以使用2获得：

hAx = ;

最佳答案 我设法提出了几个解决方案：

> safeUpdateImage1 – 基于在使用hold之后通过在轴内创建新Image对象来规避cla(…).这对于轴中不一定存在图像的情况很有用.

> safeUpdateImage2 – 遵循mikkola’s suggestion,基于更新现有的Image对象.这适用于已有ColorBar和与轴关联的Image的情况.以下是两个解决方案与原始问题的演示：

function [] = Problem

dbclear in newplot %// Needed for the code to be properly re-runnable

%// Create an example figure containing a colorbar:

Img = imread('');

figure(); imagesc(Img); hAx = gca; colorbar;

%// Refreshing the displayed image (comment/uncomment as needed):

switch questdlg('Please select an image update method:','Update method selection',...

'Broken','Safe1','Safe2','Safe1')

case 'Broken'

brokenUpdateImage(hAx,255-Img);

case 'Safe1'

safeUpdateImage1(hAx,255-Img);

case 'Safe2'

safeUpdateImage2(hAx,255-Img);

end

end

function brokenUpdateImage(hAx,newImg)

uiwait(msgbox('The image will now be refreshed. A breakpoint will be set in NEWPLOT'));

dbstop in newplot at 124 %// The line responsible for deleting the colorbar in R2015A/B

imagesc(newImg,'Parent',hAx);

end

% For cases when the only desired child is an Image and the axes contents are unknown

function safeUpdateImage1(hAx,newImg,imgType,imgUpdateFcn)

if nargin < 4 || isempty(imgUpdateFcn)

imgUpdateFcn = @imagesc;

end

if nargin < 3 || isempty(imgType)

imgType = 'Image';

end

if strcmp(ot,'replace') %// Equivalent to checking "ishold == false"

ot = 'add'; %// Equivalent to "hold on"

%// hCurrImgs = get(hAx,'Children'); %// Deletes all types of Children

hCurrImgs = findall(hAx,'type','Image'); %// Deletes only graphical objects of type%// ""for ind1=1:numel(hCurrImgs)delete(hCurrImgs(ind1));endimgUpdateFcn(newImg,'Parent',hAx);if strcmpi(imgType,'Image')axis(hAx,'tight','ij');%// 'tight' - XLimMode, YLimMode, and ZLimMode change to 'auto'. The limits automatic-%// ally update to incorporate new data added to the axes. To keep the limits%// from changing when using hold on, use axis tight manual.%// 'ij' — Reverse direction. For axes with a 2-D view, the y-axis is vertical with%// values increasing from top to end%// When it's known that the axes contains at least one Image:function safeUpdateImage2(hAx,newImg,~,~)%//hCurrImgs = findall(hAx,'type','Image');%//hCurrImgs(1).CData = newImg; %// In this example, only update the "topmost" childend