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function findYvrange(Vmin,Vmax)
.. volt range
cv=[20,10,5,2,1,0.5,0.2,0.1,0.05,0.02,0.01,0.005,0.002,0.001];
.. find the right range
cvi=1;
for i=1 to length(cv)-1
if (4*cv[i+1] < Vmax) || (-4*cv[i+1] > Vmin);
cvi=i;
break;
endif;
end;
return cv[cvi];
endfunction
function findXvrange(Vmin,Vmax)
.. volt range
cv=[20,10,5,2,1,0.5,0.2,0.1,0.05,0.02,0.01,0.005,0.002,0.001];
.. find the right range
cvi=1;
for i=1 to length(cv)-1
if (5*cv[i+1] < Vmax) || (-5*cv[i+1] > Vmin);
cvi=i;
break;
endif;
end;
return cv[cvi];
endfunction
function findtrange(Tmax)
.. time range
ct=[0.2,0.1,0.05,0.02,0.01,0.005,0.002,0.001,0.0005,0.0002,0.0001,0.00005,0.00002,0.00001,0.000005,0.000002,0.000001,0.0000005];
.. find the right range
cti=1;
for i=1 to length(ct)-1
if (10*ct[i+1]+epsilon < Tmax);
cti=i;
break;
endif;
end;
return ct[cti];
endfunction
function drawgrid(dt,dv)
ho=holding(1);
lw=linewidth(1);
c=color(1);
.. draw vertical lines
ls=linestyle(".");
for i=1 to 9
if i != 5
plot([i*dt,i*dt],[-4*dv,4*dv]);
endif;
end;
linestyle(ls);
plot([5*dt,5*dt],[-4*dv,4*dv]);
for j=1 to 49
plot([j/5*dt,j/5*dt],[-0.1*dv,0.1*dv]);
end;
.. draw horizontal lines
ls=linestyle(".");
for i=-3 to 3
if i != 0;
plot([0,10*dt],[i*dv,i*dv]);
endif;
end;
linestyle(ls);
plot([0,10*dt],[0,0]);
for j=-19 to 19
plot([4.9*dt,5.1*dt],[j/5*dv,j/5*dv]);
end;
color(c);
linewidth(lw);
holding(ho);
return 0;
endfunction;
function drawXYgrid(dv1,dv2)
ho=holding(1);
lw=linewidth(1);
c=color(1);
.. draw vertical lines
ls=linestyle(".");
for i=-4 to 4
if i != 0
plot([i*dv1,i*dv1],[-4*dv2,4*dv2]);
endif;
end;
linestyle(ls);
plot([0,0],[-4*dv2,4*dv2]);
for j=-24 to 24
plot([j/5*dv1,j/5*dv1],[-0.1*dv2,0.1*dv2]);
end;
.. draw horizontal lines
ls=linestyle(".");
for i=-3 to 3
if i != 0;
plot([-5*dv1,5*dv1],[i*dv2,i*dv2]);
endif;
end;
linestyle(ls);
plot([-5*dv1,5*dv1],[0,0]);
for j=-19 to 19
plot([-0.1*dv1,0.1*dv1],[j/5*dv2,j/5*dv2]);
end;
color(c);
linewidth(lw);
holding(ho);
return 0;
endfunction;
function scope (x=0,y1=0,y2=0)
## o scope(x,y1,), scope(x,,y2) and scope(x,y1,y2) shows a scope grid and
## the curves y1(x) or y2(x) or both.
## o scope(,y1,y2) shows the curve y2(y1) in XY mode.
## o scope() shows only the grid.
if argn()==0;
p=plot();
else if (argn()==1);
error("not enough parameters (2 at least)");
else if (argn()==2) || ((argn()==3) && (y1==0));
.. normal mode ; one curve
if !holding();clg; frame();endif;
dt=findtrange(max(x));
if (y2==0);
dv1=findYvrange(min(y1),max(y1));
else
dv1=findYvrange(min(y2),max(y2));
endif;
p=[0,10*dt,-4*dv1,4*dv1];setplot(p);
drawgrid(dt,dv1);
.. display ranges
tp=toscreen([7.5*dt,3.8*dv1]);
text("time : "|printf("%g s/div",dt),tp);
tp[2]=tp[2]+textheight();
if (y2==0);
text("CH1 : "|printf("%g V/div",dv1),tp);
ho=holding(1); plot(x,y1); holding(ho);
else
text("CH2 : "|printf("%g V/div",dv1),tp);
ho=holding(1); plot(x,y2); holding(ho);
endif;
else if (argn()==3) && (x==0);
.. XY mode
if !holding();clg; frame();endif;
dv1=findXvrange(min(y1),max(y1));
dv2=findYvrange(min(y2),max(y2));
p=[-5*dv1,5*dv1,-4*dv2,4*dv2];setplot(p);
drawXYgrid(dv1,dv2);
.. display ranges
tp=toscreen([2.5*dv1,3.8*dv2]);
text("CH1 (X) : "|printf("%g V/div",dv1),tp);
tp[2]=tp[2]+textheight();
text("CH2 (Y) : "|printf("%g V/div",dv2),tp);
ho=holding(1); plot(y1,y2); holding(ho);
else
.. normal display ; two curves
if !holding();clg; frame();endif;
dt=findtrange(max(x));
dv1=findYvrange(min(y1),max(y1));
dv2=findYvrange(min(y2),max(y2));
p=[0,10*dt,-4*dv1,4*dv1];setplot(p);
drawgrid(dt,dv1);
.. display ranges
tp=toscreen([7.5*dt,3.8*dv1]);
text("time : "|printf("%g s/div",dt),tp);
tp[2]=tp[2]+textheight();
text("CH1 : "|printf("%g V/div",dv1),tp);
tp[2]=tp[2]+textheight();
text("CH2 : "|printf("%g V/div",dv2),tp);
ho=holding(1); plot(x,y1); plot(x,dv1/dv2*y2); holding(ho);
endif;
endif;
endif;
endif;
return p;
endfunction
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