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Marcos Silveira
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on 19 Nov 2023

drawframe(1);

Write your drawframe function below

function drawframe(f)
persistent x y vx vy c p1 markerSize vDrag weightFactor shrinkFactor;
if f==1
    nSparks = 150; % number of sparks
    markerSize = 14; % size of sparks
    vScale = 10; % velocity scale
    vDrag = 0.65; % a bit of drag so sparks don't travel too far
    weightFactor = 0.07; % what goes up...
    shrinkFactor = 0.8; % sparks loose intensity with time
    x = ones(1,nSparks)*randn(1)*100; % position of explosion
    y = ones(1,nSparks)*randn(1)*100+150;
    vx = randn(1,nSparks)*vScale; % velocity of each spark
    vy = randn(1,nSparks)*vScale;
    c = 0.3+0.7*rand(1,3);
    p1 = plot(x,y,'o','MarkerSize',markerSize,'MarkerEdgeColor','none', ...
        'MarkerFaceColor',c); % new explosion, plots all sparks
    axis([-400 400 -400 400]);
    set(gca,'Color','k');
else
    set(p1,'xdata',x+(f^vDrag)*vx, ...
        'ydata',y+(f^vDrag)*vy-weightFactor*(f)^2, ...
        'MarkerSize',markerSize/(f^shrinkFactor));
end
end

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