在Matlab中蚀刻类似草图的绘图

时间:2015-05-05 14:16:56

标签: matlab user-interface drawing axis

我在Matlab中创建了一个图形用户界面,并进行了以下设置:

enter image description here

然后我在滑块回调中得到了这段代码:

plot(get(handles.slider2,'Value'),get(handles.slider1,'Value'));
plot(get(handles.slider2,'Value'),get(handles.slider1,'Value'));

所以,每当我调整左边的滑块时,点会移动+1垂直。当我调整底部滑块时,点将移动+1水平。

我实际想要的是每次调整其中一个滑块时画一条线。并且之前的操作仍然会在图表上显示。因此,之后,您可以看到从开始到结束的整个路线。

1 个答案:

答案 0 :(得分:2)

这是让你前进的东西。代码非常重复,诀窍是:

1)创建一个Nx2数组来存储移动点/线的坐标,并在移动滑块时更新。第1列是x坐标,第2列是y坐标。

2)创建与每个滑块关联的侦听器对象,以生成平滑,连续的绘图。

3)发出hold on命令后,只显示包含位置的数组的最后一行。

这里我使用散点图,但我会让你弄清楚如何使用LineSeries对象。这很简单:)

您还可以自定义点的外观。在这里,我将起点设为一个大黑点,每次释放滑块时(执行回调时)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:

enter image description here

请注意,移动越慢,绘图上的点越近。我移动得非常快,因此在某些点之间有很大的空间。

玩得开心!