How to generate a triangular datasset in matlab

The code above is generate vertical and horizontal lines. I want to generate in the same way two types of triangular, one straight and one upside down. I want to get triangulars similiar to that:

enter image description here

I will thank for your help how to do this.

The code:

close all clear

horFolder = 'C:\Users\HorVer_Dataset\0'; verFolder = 'C:\Users\HorVer_Dataset\1';

N = 1000 ;

for indx=1:N

I = uint8 ( zeros (80, 80 ) ) ;

lineX = round(10 + rand*60) ;

lineY = round(10 + rand*60) ;

lineW = round(1 + rand) ;

lineH = round(15+20*rand) ;

if rand < 0.5

lineDirection = 'H' ;

imageFolder = horFolder ;

xRange = max(1, (lineY-round(lineH/2))):min(80, (lineY+round(lineH/2))) ;

yRange = max(1, (lineX-round(lineW/2))):min(80, (lineX+round(lineW/2))) ;

else

lineDirection = 'V' ;

imageFolder = verFolder ;

xRange = max(1, (lineX-round(lineW/2))):min(80, (lineX+round(lineW/2))) ;

yRange = max(1, (lineY-round(lineH/2))):min(80, (lineY+round(lineH/2))) ;

end

I(yRange, xRange) = 255 ;

indxStr = num2str(indx) ;

while length(indxStr) < 4

indxStr = [ '0' indxStr ] ;

end

imageFileName = [ imageFolder, '\Line', indxStr, '.png' ] ;

imwrite ( I, imageFileName ) ;

% figure % imshow (I) end