Created
November 28, 2019 23:33
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GCMC source code: Draw and label a decade of logarithmic ticks
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//---- | |
// Define tick layout for scales | |
// Numeric value for scale, corresponding tick length | |
TickScaleNarrow = { | |
[1.0,TickMajor], | |
[1.1,TickMinor],[1.2,TickMinor],[1.3,TickMinor],[1.4,TickMinor], | |
[1.5,TickMid], | |
[1.6,TickMinor],[1.7,TickMinor],[1.8,TickMinor],[1.9,TickMinor], | |
[2.0,TickMajor], | |
[2.2,TickMinor],[2.4,TickMinor],[2.6,TickMinor],[2.8,TickMinor], | |
[3.0,TickMajor], | |
[3.2,TickMinor],[3.4,TickMinor],[3.6,TickMinor],[3.8,TickMinor], | |
[4.0,TickMajor], | |
[4.5,TickMinor], | |
[5.0,TickMajor], | |
[5.5,TickMinor], | |
[6.0,TickMajor], | |
[6.5,TickMinor], | |
[7.0,TickMajor], | |
[7.5,TickMinor], | |
[8.0,TickMajor], | |
[8.5,TickMinor], | |
[9.0,TickMajor], | |
[9.5,TickMinor] | |
}; | |
TickScaleWide = { | |
[1.0,TickMajor], | |
[1.1,TickMinor],[1.2,TickMinor],[1.3,TickMinor],[1.4,TickMinor], | |
[1.5,TickMid], | |
[1.6,TickMinor],[1.7,TickMinor],[1.8,TickMinor],[1.9,TickMinor], | |
[2.0,TickMajor], | |
[2.1,TickMinor],[2.2,TickMinor],[2.3,TickMinor],[2.4,TickMinor], | |
[2.5,TickMid], | |
[2.6,TickMinor],[2.7,TickMinor],[2.8,TickMinor],[2.9,TickMinor], | |
[3.0,TickMajor], | |
[3.2,TickMinor],[3.4,TickMinor],[3.6,TickMinor],[3.8,TickMinor], | |
[4.0,TickMajor], | |
[4.2,TickMinor],[4.4,TickMinor],[4.6,TickMinor],[4.8,TickMinor], | |
[5.0,TickMajor], | |
[5.5,TickMinor], | |
[6.0,TickMajor], | |
[6.5,TickMinor], | |
[7.0,TickMajor], | |
[7.5,TickMinor], | |
[8.0,TickMajor], | |
[8.5,TickMinor], | |
[9.0,TickMajor], | |
[9.5,TickMinor] | |
}; | |
TickLabels = [1,2,5]; // labels only these ticks, must be integers | |
/----- | |
// Draw a decade of ticks & labels | |
// ArcLength > 0 = CCW, < 0 = CW | |
// UnitOnly forces just the unit tick, so as to allow creating the last tick of the scale | |
function DrawTicks(Radius,TickMarks,TickOrient,UnitAngle,ArcLength,Decade,LabelOrient,UnitOnly) { | |
feedrate(ScaleSpeed); | |
local a,r0,r1,p0,p1; | |
if (Decade == 1 || UnitOnly) { // draw unit marker | |
a = UnitAngle; | |
r0 = Radius + TickOrient * (TickMajor + 2*TickGap + ScaleTextSize.y); | |
p0 = r0 * [cos(a),sin(a)]; | |
r1 = Radius + TickOrient * (ScaleSpace - 2*TickGap); | |
p1 = r1 * [cos(a),sin(a)]; | |
goto(p0); | |
move([-,-,EngraveZ]); | |
move(p1); | |
goto([-,-,TravelZ]); | |
} | |
local ticklist = UnitOnly ? {TickMarks[0]} : TickMarks; | |
local tick; | |
foreach(ticklist; tick) { | |
a = UnitAngle + ArcLength * log10(tick[0]); | |
p0 = Radius * [cos(a), sin(a)]; | |
p1 = (Radius + TickOrient*tick[1]) * [cos(a), sin(a)]; | |
goto(p0); | |
move([-,-,EngraveZ]); | |
move(p1); | |
goto([-,-,TravelZ]); | |
} | |
feedrate(TextSpeed); // draw scale values | |
local lrad = Radius + TickOrient * (TickMajor + TickGap); | |
if (TickOrient == INWARD) { | |
if (LabelOrient == INWARD) { | |
lrad -= ScaleTextSize.y; // inward ticks + inward labels = offset inward | |
} | |
} | |
else { | |
if (LabelOrient == OUTWARD) { | |
lrad += ScaleTextSize.y; // outward ticks + outward labels = offset outward | |
} | |
} | |
ticklist = UnitOnly ? [TickLabels[0]] : TickLabels; | |
local ltext,lpath,tpa; | |
foreach(ticklist; tick) { | |
ltext = to_string(Decade * to_int(tick)); | |
lpath = scale(typeset(ltext,TextFont),ScaleTextSize); | |
a = UnitAngle + ArcLength * log10(tick); | |
tpa = ArcText(lpath,[0mm,0mm],lrad,a,TEXT_CENTERED,LabelOrient); | |
engrave(tpa,TravelZ,EngraveZ); | |
} | |
} |
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