What is wrong with my code.I want to connect stars(*)by straight line,but it's printing only points,not line!

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vidushi Chaudhary 2020-5-29

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评论： Steven Lord 2020-5-29

function draw_constellations
    set(gcf,'color','m');
    set(gca,'color','m');
    axis([0 100 0 100])
    hold on;
    
    while 1
        [x,y,button]=ginput(1);
        switch button
            case 1
                    plot(x,y,'w*-');
               
            case{'q','Q'}
                break;
        end
        
    end
end

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Answer 1

Steven Lord 2020-5-29

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You're creating one line per ginput call, plotting one point per line. They're not all the same line object so they're not connected. I would create an animatedline object before entering the while loop and addpoints to it inside.

h = animatedline('Marker', '*', 'LineStyle', '-');
while 1
    [x,y,button]=ginput(1);
    switch button
        case 1
            addpoints(h, x, y);
            
        case{'q','Q'}
            break;
    end
    
end

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vidushi Chaudhary 2020-5-29

How to white color to the points & line?

Steven Lord 2020-5-29

Specify additional properties of the animatedline when you construct it, like I did with the Marker and LineStyle properties. The properties you can change are listed on this documentation page.

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