MATLAB鼠标事件应用（记录）

前记：

      人机交互的方式--键盘开关、鼠标、触摸屏、体感传感器（Kinect、leap motion）等的使用大大促进人与机器的交流过程。

这里记录鼠标事件与MATLAB的结合，为后期机器人仿真控制打下基础---如鼠标直接拖动机器人运动（像很多机器人仿真软件里的作用一样，如Robotstudio、soldworks、proe\core、Adams等）。

1、鼠标画矩形

   代码功能：运行代码在出现的figure窗口，点击鼠标画出矩形

k = waitforbuttonpress;
point1 = get(gca,'CurrentPoint');    % button down detected
finalRect = rbbox;                   % return figure units
point2 = get(gca,'CurrentPoint');    % button up detected
point1 = point1(1,1:2);              % extract x and y
point2 = point2(1,1:2);
p1 = min(point1,point2);             % calculate locations
offset = abs(point1-point2);         % and dimensions
x = [p1(1) p1(1)+offset(1) p1(1)+offset(1) p1(1) p1(1)];
y = [p1(2) p1(2) p1(2)+offset(2) p1(2)+offset(2) p1(2)];
hold on
axis manual
plot(x,y)

2、鼠标拖动直线

 function main
f =figure;
aH=axes('Xlim',[0 1],'Ylim',[0 1]);
h=line([0.5 0.5],[0 1],...
          'color','red',...
          'linewidth',4,...
          'ButtonDownFcn',@startDragFcn);
 set(f,'WindowButtonUpFcn',@startDragFcn);
 function startDragFcn(varargin)
      set(f,'WindowButtonMotionFcn',@draggingFcn);
 end
 function draggingFcn(varargin)
      pt=get(aH,'CurrentPoint');
      set(h,'Xdata',pt(1)*[1 1]);
 end
 function stopDragFcn(varargin)
     set(f,'WindowButtonMotionFcn','');
 end
 end

3、显示坐标

function ff
x = 5:30;
y = x.^2-40.*x+400;
plot(x,y);
axis([5,30,-50,250]);
  
tb = text;
set(gcf, 'WindowButtonMotionFcn', @callback);
  
function callback(hObject, event)
    loc = get(gca, 'CurrentPoint');
    loc = loc([1 3]);
    set(tb, 'string', num2str(loc), 'position', loc);
end
end

4、画轨迹并保存点坐标

function  MouseDraw(action)
% MouseDraw 本例展示如何以Handle Graphics来设定滑鼠事件
% (MouseDraw Events)的反应指令(Callbacks)

% 本程序在鼠标移动非常快时，不会造成画“断线”
% global不能传矩阵
global InitialX InitialY FigHandle
if nargin == 0, action = 'start';   
end

switch(action)
    %%开启图形视窗
    case 'start'
        FigHandle = figure('WindowButtonDownFcn','MouseDraw down');
        axis([-600 600 -600 600]);    % 设定图轴范围
%         axis off;
        grid on;
        box on;     % 将图轴加上图框
        title('手写体输入窗');
% %         fprintf('start');
        %%设定滑鼠按钮被按下时的反应指令为「MouseDraw down」
        % set(gcf, 'WindowButtonDownFcn', 'MouseDraw down');  
        dlmwrite('IXT.txt', 10, 'delimiter', '\t', 'precision', 10);
        dlmwrite('IZT.txt', 10, 'delimiter', '\t', 'precision', 10);
        %%滑鼠按钮被按下时的反应指令
    case 'down'
        if strcmp(get(FigHandle, 'SelectionType'), 'normal')    %如果是左键
            set(FigHandle,'pointer','hand');      
            CurPiont = get(gca, 'CurrentPoint');
            InitialX = CurPiont(1,1);
            InitialY = CurPiont(1,2);
            dlmwrite('IXT.txt', InitialX, '-append', 'delimiter', '\t', 'precision', 10);
            dlmwrite('IZT.txt', InitialY, '-append', 'delimiter', '\t', 'precision', 10);
            % 列印「MouseDraw down!」讯息
% %             fprintf('MouseDraw down!\n');
            % 设定滑鼠移动时的反应指令为「MouseDraw move」
            set(gcf, 'WindowButtonMotionFcn', 'MouseDraw move');
            set(gcf, 'WindowButtonUpFcn', 'MouseDraw up');
        elseif strcmp(get(FigHandle, 'SelectionType'), 'alt')   % 如果是右键
            set(FigHandle, 'Pointer', 'arrow');
            set( FigHandle, 'WindowButtonMotionFcn', '')
            set(FigHandle, 'WindowButtonUpFcn', '')
            fprintf('MouseDraw right button down!\n');
            ImageX = importdata('IXT.txt');
            ImageY = importdata('IZT.txt');
            InputImage = ones(imSize);
            roundX = round(ImageX);
            roundY = round(ImageY);
            for k = 1:size(ImageX,1)
                if 0<roundX(k) && roundX(k)<imSize && 0<roundY(k) && roundY(k)<imSize
                    InputImage(roundX(k)-1:roundX(k)+2, roundY(k)-1:roundY(k)+2) = 0;
                end
            end
            InputImage = imrotate(InputImage,180);       % 图像旋转
            figure(2);
            imshow(InputImage);
        end
    %%滑鼠移动时的反应指令
    case 'move'
        CurPiont = get(gca, 'CurrentPoint');
        X = CurPiont(1,1);
        Y = CurPiont(1,2);
        % 当鼠标移动较快时，不会出现离散点。
        % 利用y=kx+b直线方程实现。
        x_gap = 1;    % 定义x方向增量
        y_gap = 1;    % 定义y方向增量
        if X > InitialX
            step_x = x_gap;
        else
            step_x = -x_gap;
        end
        if Y > InitialY
            step_y = y_gap;
        else
            step_y = -y_gap;
        end  
        % 定义x,y的变化范围和步长
        if abs(X-InitialX) < 0.1        % 线平行于y轴，即斜率不存在时
            iy = InitialY:step_y:Y;
            ix = X.*ones(1,size(iy,2));
        else
            ix = InitialX:step_x:X ;    % 定义x的变化范围和步长
            % 当斜率存在，即k = (Y-InitialY)/(X-InitialX) ~= 0
            iy = (Y-InitialY)/(X-InitialX).*(ix-InitialX)+InitialY;   
        end
        ImageX = [ix, X]; 
        ImageY = cat(2, iy, Y);
        line(ImageX,ImageY, 'marker', '.', 'markerSize',1, ...
            'LineStyle', '-', 'LineWidth', 2, 'Color', 'Blue');
        dlmwrite('IXT.txt', ImageX, '-append', 'delimiter', '\t', 'precision', 10);
        dlmwrite('IZT.txt', ImageY, '-append', 'delimiter', '\t', 'precision',10);
        InitialX = X;       %记住当前点坐标
        InitialY = Y;       %记住当前点坐标
        % 列印「MouseDraw is moving!」及滑鼠现在位置
        % fprintf('MouseDraw is moving! Current location = (%g, %g)\n', ...
          % CurPiont(1,1), CurPiont(1,2));
% %         fprintf('MouseDraw move!\n');
        % 设定滑鼠按钮被释放时的反应指令为「MouseDraw up」
        % set(gcf, 'WindowButtonUpFcn', 'MouseDraw up');
    %%滑鼠按钮被释放时的反应指令
    case 'up'
        % 清除滑鼠移动时的反应指令
        set(gcf, 'WindowButtonMotionFcn', '');
        % 清除滑鼠按钮被释放时的反应指令
        set(gcf, 'WindowButtonUpFcn', '');
        % 列印「MouseDraw up!」
% %         fprintf('MouseDraw up!\n');
end

end

5、也是拖动直线的，不过一个拖动时，另一个不动。点击show position...在命令行返回数值（因为有GUI所以打包放在我的资源里了，需要的自己下）点击打开链接。

6、后记

以上为网上资源的收集，主要是供自己学习。如果碰巧你需要，甚幸~.~ //