Bitmap/Bresenham's line algorithm: Difference between revisions

Content added Content deleted
(→‎{{header|zkl}}: added writeJPGFile)
Line 3,117:
sz:=width*height;
var [const]
data=sz.pump(Data(sz*3),T.fill(Void,rgb.toBigEndian(3).toData()), // initialize to 24bit Black (RGB=000)
w=width, h=height;
}
fcn fill(rgb){ data.fill(rgb.toBigEndian(3).toData()) }
sz:=data.len()/3;
data.clear(); sz.pump(data,T(Void,rgb.toBigEndian(3)));
}
fcn __sGet(x,y) { data.toBigEndian(3*y*w + 3*x,3); } //ppm[x,y]
fcn __sSet(rgb,x,y){ data[3*y*w + x*3,3]=rgb.toBigEndian(3); rgb } //ppm[x,y]=rgb
fcn write(out,raw=False){ // write bottom to top to move (0,0) from top left to bottom left
out.write("P6\n#rosettacode PPM\n%d %d\n255\n".fmt(w,h));
[h-1..0, -1].pumpif(out,'wrap(hraw){ dataout.seekwrite(3*h*w); data.read(3*w) });
else [h-1..0, -1].pump(out,'wrap(h){ data.seek(3*h*w); data.read(3*w) });
}
fcn writeJPGFile(fname){ // Linux, using imagemagick
System.popen(0'|convert ppm:- jpg:"%s"|.fmt(fname),"w") :
write(_,vm.pasteArgs(1));
}
fcn readPPMFile(fileName){
Retrieved from "https://rosettacode.org/wiki/Bitmap/Bresenham%27s_line_algorithm"