rectangle to draw a line

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Vincent I 2013-1-14

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Hi, I'm using rectangle to draw a circle then a line in a for loop. However, when I draw the second line, after drawing the circle, the line width is slimmer than the previous drawn line and even the next drawn lines.

I'm confuzed. I saved the handle and looked at the first created line and compared it to the second line. However, they are identical. Any advice?

Thank you

 for m=1:10
   rectangle('parent',handles.Axes9,'Position',[x,y,30,30],'Curvature',...
             [1,1],'FaceColor',color);
   rectangle('parent',handles.Axes9,'Position',... 
              x+14,y+30,1,h],'FaceColor','black');
   text(x+8,y+15, {m},'fontsize',14,'color','black',...
             'fontweight','bold','parent',handles.Axes9);            
 end

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Answer 1

Image Analyst 2013-1-14

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You probably need to use "hold on" in between those calls. But why not use line() or plot() to create a line? Why use rectangle to create a line?

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Vincent I 2013-1-15

编辑：Jan 2013-1-15

在 MATLAB Online 中打开

when I said "they are identical" i didnt mean the handle number is the same. What I meant is that the handle is identical except the handle number. If

Below is a smiplified version of my code that shows the issue that I'm having:

 handles.Axes9=axes;
 set(handles.Axes9,'xlim',[0 800],'ylim',[0 300])
 color='green';
 for a=1:6
        switch a
            case 1
                x = 20; y = 10; h = 125;
            case 2
                x = 60; y = 10; h = 120;
            case 3
                x = 170; y = 10; h = 135;
            case 4
                x = 325; y = 10; h = 120;
            case 5
                x = 540; y = 10; h = 130;
            case 6
                x = 570; y = 10; h = 130;
        end
        rectangle('parent',handles.Axes9,'Position', [x,y,30,30],'Curvature',[1,1],'FaceColor',color);
        rectangle('parent',handles.Axes9,'Position',[x+14,y+30,1,h],'FaceColor','black');
        text(x+8,y+15,{a},'fontsize',14,'color','black','fontweight','bold','parent',handles.Axes9); 
    end

thank you

Jan 2013-1-15

Do you mean: "that the line is identical except for the handle number"?

Vincent I 2013-1-15

编辑：Vincent I 2013-1-15

:-) yes. the rectangle "line" is identical except the handle number

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Answer 2

Jan 2013-1-15

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https://ww2.mathworks.cn/matlabcentral/answers/58751-rectangle-to-draw-a-line#answer_71241

This has been a useful example.

The code is correct and the display of the graphics is correct also. You see the effect, that rectangle draws to rounded pixel positions. And sometimes they are nearer to each other, such that the line looks smaller. When you resize the figure, you will see, that other lines are concerned.

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Malcolm Lidierth 2013-1-16

Does any of this help?:

http://undocumentedmatlab.com/blog/plot-linesmoothing-property/

Vincent I 2013-1-16

在 MATLAB Online 中打开

fixed my issue by doing the following:

 rectangle('parent',findobj(0,'Tag','Axes9'),'Position', [x,y,30,30],'Curvature',[1,1],'FaceColor',color);
 line([x+15 x+15],[y+30 y+h],'LineWidth',2,'Color','Black','parent',findobj(0,'Tag','Axes9'))

and deleting everything with:

 delete(findobj(findobj(0,'tag','Axes9'),'Type','Text','-or','type','rectangle','-or','type','line'))

Thank you for all your help

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