function firework

% 烟花烟花满天飞

% CopyRight：xiezhh(谢中华)

% 2011.6.25

OldHandle = findobj( 'Type', 'figure', 'Tag', 'FireWork' ) ;

if ishandle(OldHandle)

close(OldHandle) ;

end

% 图形窗口初始化

fig = figure('units','normalized','position',[0.1 0.1 0.8 0.8],...

'menubar','none','name','烟花满天飞(谢中华制作)',...

'numbertitle','off','color',[0 0 0],'tag','FireWork');

% 烟花炸开前的初始位置

h0 = line(0,0,0,'marker','.',...

'markersize',18,...

'MarkerEdgeColor',[1 1 1],...

'MarkerFaceColor',[1 1 1],...

'EraseMode' , 'xor',...

'color',[0 0 0]);

% 设置坐标系显示属性

axis equal

axis([-50 50 -50 50 0 100])

axis off

view(-42,22)

% 设置参数

rate = 1:-0.01:0;  % 颜色衰减率

v0 = 45;  % 烟花头初始速度

g = -9.8;   % 重力加速度

usedtime = -v0/g;  % 烟花头爆炸前所经历时间

zs = v0*usedtime+0.5*g*usedtime^2;  %烟花头爆炸前达到的最高高度

theta = rand(250,1)*2*pi;  % 各粒子速度的方位角

phi =  rand(250,1)*2*pi-pi;  % 各粒子速度的仰角

age = 20;  % 粒子生存期

% 常用颜色矩阵

colormat = [1.0  0.5  0.5

1.0  0.75  0.5

1.0  1.0  0.5

0.75  1.0  0.5

0.5  1.0  0.5

0.5  1.0  0.75

0.5  1.0  1.0

0.5  0.75  1.0

0.5  0.5  1.0

0.75  0.5  1.0

1.0  0.5  1.0

1.0  0.5  0.75];

% 随机产生各粒子对应的颜色序号

colorid = randsample(12,250,true);

% 粒子对应的颜色矩阵

colormat = colormat(colorid,:);

% 粒子颜色与背景色(夜色)的距离

colordist = sqrt(sum(colormat.^2,2));

v1 = 20;  % 粒子的初始速度

k = 1;   % 颜色衰减率初始序号

timerA = timer('TimerFcn',@TimerFcnA,...

'executionmode','fixedspacing','Period',0.001);

start(timerA);

h = getappdata(gcf,'HandleParticle');

timerB = timer('TimerFcn',{@TimerFcnB},...

'executionmode','fixedspacing','period',0.001);

%--------------------------------------------------------------------------

%  定时器回调函数(烟花头)

%--------------------------------------------------------------------------

function TimerFcnA(timerA,event)

ta = get(timerA,'TasksExecuted')*0.1;

if ta <= usedtime

z = v0*ta+0.5*g*ta^2;

set(h0,'zdata',z,...

'MarkerEdgeColor',[1 1 1],...

'MarkerFaceColor',[1 1 1])

drawnow

%pause(0.01)

else

delete(h0)

stop(timerA);

x0 = zeros(2,250);

y0 = zeros(2,250);

z0 = zs*ones(2,250);

h = line(x0,y0,z0,'marker','h',...

'markersize',12,...

'MarkerEdgeColor',[1 1 1],...

'MarkerFaceColor',[1 1 1],...

'EraseMode' , 'xor',...

'color',[0 0 0]);

setappdata(gcf,'HandleParticle',h);

start(timerB);

end

end

%--------------------------------------------------------------------------

%  定时器回调函数(粒子)

%--------------------------------------------------------------------------

function TimerFcnB(timerB,event)

tb = get(timerB,'TasksExecuted')*0.15;

if age>0 && any(colordist>=0.05)

colormat = colormat*rate(k);

colordist = sqrt(sum(colormat.^2,2));

for i = 1:250

xi = v1*cos(phi(i))*cos(theta(i))*tb;

yi = v1*cos(phi(i))*sin(theta(i))*tb;

zi = zs+v1*sin(phi(i))*tb+0.5*g*tb^2;

set(h(i),'XData',xi,'YData',yi,'ZData',zi,...

'MarkerEdgeColor',colormat(i,:),...

'MarkerFaceColor',colormat(i,:))

end

drawnow

age = age-0.1;

k = k+1;

else

stop(timerB);

delete(h)

end

end

%-------------------

end