make image matrix with beam traces

1 files changed, 39 insertions, 0 deletions

diff --git a/make_beam_trace.m b/make_beam_trace.m
new file mode 100644
index 0000000..c2257a6
--- /dev/null
+++ b/make_beam_trace.m
@@ -0,0 +1,39 @@
+function img=make_beam_trace(beam, stop_point, border_limits, img)
+	% img so far beam traced part
+	% border_limits has coordinates of left bottom and right top coners
+	xlb=border_limits(1);
+	ylb=border_limits(2);
+	xrt=border_limits(3);
+	yrt=border_limits(4);
+
+	% beam start stop coordinates with respect to lower left border point
+	xb1=beam.origin(1)-xlb;
+	yb1=beam.origin(2)-ylb;
+	xb2=stop_point(1)-xlb;
+	yb2=stop_point(2)-ylb;
+
+	% beam path coordinates
+	Nc=100;  % number of coordinate points
+	xb=linspace(xb1,xb2, Nc);
+	yb=linspace(yb1,yb2, Nc);
+
+	% beam coordinate to image pixel coordinate
+
+	[Ny,Nx]=size(img);
+
+	px=round(xb/(xrt-xlb)*(Nx-1) + 1);
+	py=round(yb/(yrt-ylb)*(Ny-1) + 1);
+
+	% truncate to borders
+	py=py( (1<=px) & (px<=Nx) );
+	px=px( (1<=px) & (px<=Nx) );
+
+	px=px( (1<=py) & (py<=Ny) );
+	py=py( (1<=py) & (py<=Ny) );
+
+	for i=1:length(px)
+		img(py(i),px(i))=beam.intensity;
+	end
+end
+
+