我用Matlab制作了一个图形用户界面,并进行了以下设置:

然后我在滑块回调中得到了这个代码:
plot(get(handles.slider2,'Value'),get(handles.slider1,'Value'));
plot(get(handles.slider2,'Value'),get(handles.slider1,'Value'));所以,每次我调整左边的滑块,点就会垂直移动+1。当我调整底部的滑块时,点将水平移动+1。
我真正想要的是每次调整滑块时绘制一条线。并且之前的操作在图形上仍然可见。这样之后,你就可以看到从头到尾的整个路线。
发布于 2015-05-05 22:37:11
这里有一些东西可以让你继续下去。代码相当重复,诀窍在于:
1)创建一个Nx2数组来存储移动点/线的坐标,随着滑块的移动而更新。第一列是x坐标,第二列是y坐标。
2)创建一个与每个滑块关联的侦听器对象,以生成平滑、连续的绘图。
3)下发hold on命令后,只显示包含位置的数组的最后一行。
在这里,我使用散点图,但我将让您了解如何使用LineSeries对象。这很简单:)
您还可以自定义这些点的外观。这里我把起始点设为一个大黑点,每次释放滑块(当它的回调被执行时)都会显示一个蓝点。
function DrawMarkerLine(~)
clc
clear
hFig = figure('Position',[100 100 400 400],'Units','normalized');
%// create axes with handle
handles.axes1 = axes('Position', [0.2 0.2 0.6 0.6],'XLimMode','manual','YLimMode','manual','XLim',[-4 4],'YLim',[-4 4]);
%// create x slider with handle
handles.x_slider = uicontrol('style', 'Slider','Min',-4,'Max',4,'Value', 0,'units','normalized','position', [0.2 0.08 0.6 0.08], 'callback', @(s,e) UpdateX);
handles.SliderxListener = addlistener(handles.x_slider,'Value','PostSet',@(s,e) XListenerCallBack);
%// create y slider with handle
handles.y_slider = uicontrol('style', 'Slider', 'Min', -4, 'Max', 4, 'Value', 0, 'units', 'normalized', 'position', [0.08 0.2 0.08 0.6], 'callback', @(s,e) UpdateY);
handles.SlideryListener = addlistener(handles.y_slider,'Value','PostSet',@(s,e) YListenerCallBack);
%// Initialize Nx2 array (x and y coordinates) containing all the positions
handles.AllPositions = [0 0];
handles.Sc = scatter(handles.axes1,handles.AllPositions(1,1),handles.AllPositions(1,2),200,'k','filled');
%// set axis equal to the sliders min and max
set(handles.axes1, 'YLim', [-4 4], 'XLim', [-4 4],'XTick',-4:1:4,'YTick',-4:1:4);
guidata(hFig,handles);
%// Listeners callbacks followed by sliders callbacks. They are all the ame
%// basically.
function XListenerCallBack
handles = guidata(hFig); %// Get handles.
%// Get position of both sliders
xval = (get(handles.x_slider,'value'));
yval = (get(handles.y_slider,'value'));
%// Concatenate all values
handles.AllPositions = [handles.AllPositions; xval yval];
hold on
%// Draw markers
scatter(handles.AllPositions(end,1),handles.AllPositions(end,2),40,'r')
drawnow
set(handles.axes1, 'YLim', [-4 4], 'XLim', [-4 4]); %// Set axis limits
guidata(hFig,handles);
end
function YListenerCallBack
handles = guidata(hFig);
xval = (get(handles.x_slider,'value'));
yval = (get(handles.y_slider,'value'));
handles.AllPositions = [handles.AllPositions; xval yval];
hold on
%// Draw markers
scatter(handles.AllPositions(end,1),handles.AllPositions(end,2),40,'r')
drawnow
set(handles.axes1, 'YLim', [-4 4], 'XLim', [-4 4]); %// Set axis limits
guidata(hFig,handles);
end
function UpdateY(~)
handles = guidata(hFig); %// Get handles.
%// Get position of both sliders
xval = (get(handles.x_slider,'value'));
yval = (get(handles.y_slider,'value'));
handles.AllPositions = [handles.AllPositions; xval yval];
hold on
%// Draw markers
scatter(handles.AllPositions(end,1),handles.AllPositions(end,2),100,'b','filled')
drawnow
set(handles.axes1, 'YLim', [-4 4], 'XLim', [-4 4]); %// Set axis limits
guidata(hFig,handles);
end
function UpdateX(~)
handles = guidata(hFig); %// Get handles.
%// Get position of both sliders
xval = (get(handles.x_slider,'value'));
yval = (get(handles.y_slider,'value'));
handles.AllPositions = [handles.AllPositions; xval yval];
hold on
%// Draw markers
scatter(handles.AllPositions(end,1),handles.AllPositions(end,2),100,'b','filled')
drawnow
set(handles.axes1, 'YLim', [-4 4], 'XLim', [-4 4]); %// Set axis limits
guidata(hFig,handles);
end
end示例输出:

请注意,移动速度越慢,曲线图上的点就越接近。我移动得相当快,因此一些点之间有很大的空间。
玩得开心!
https://stackoverflow.com/questions/30055535
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