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ptrude/: more comments; copyright headers; improved Makefile
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@ -1,13 +1,66 @@
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CFLAGS = -Wall -g
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#
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# Makefile - Makefile of ptrude
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#
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# Written 2011 by Werner Almesberger
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# Copyright 2011 by Werner Almesberger
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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SHELL = /bin/bash
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MAIN = ptrude
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OBJS = $(MAIN).o path.o
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CFLAGS = -Wall -g -Wshadow -Wmissing-prototypes \
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-Wmissing-declarations -Wno-format-zero-length
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LDFLAGS = -lm
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OBJS = ptrude.o path.o
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# ----- Verbosity control -----------------------------------------------------
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CC_normal := $(CC)
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DEPEND_normal := $(CPP) $(CFLAGS) -MM -MG
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CC_quiet = @echo " CC " $@ && $(CC_normal)
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DEPEND_quiet = @$(DEPEND_normal)
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ifeq ($(V),1)
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CC = $(CC_normal)
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DEPEND = $(DEPEND_normal)
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else
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CC = $(CC_quiet)
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DEPEND = $(DEPEND_quiet)
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endif
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# ----- Rules -----------------------------------------------------------------
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.PHONY: clean try
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ptrude: $(OBJS)
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$(MAIN): $(OBJS)
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try: ptrude
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./ptrude <try | tee out
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try: $(MAIN)
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./$(MAIN) <try | tee out
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clean:
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rm -f $(OBJS)
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rm -f $(OBJS) $(OBJS:.o=.d)
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spotless: clean
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rm -f $(MAIN)
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# ----- Dependencies ----------------------------------------------------------
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# compile and generate dependencies, from fped, based on
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# http://scottmcpeak.com/autodepend/autodepend.html
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%.o: %.c
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$(CC) -c $(CFLAGS) $*.c -o $*.o
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$(DEPEND) $*.c | \
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sed -e \
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'/^\(.*:\)\? */{p;s///;s/ *\\\?$$/ /;s/ */:\n/g;H;}' \
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-e '$${g;p;}' -e d >$*.d; \
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[ "$${PIPESTATUS[*]}" = "0 0" ] || { rm -f $*.d; exit 1; }
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-include $(OBJS:.o=.d)
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@ -1,3 +1,15 @@
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/*
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* path.c - 2D path operations
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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@ -92,6 +104,13 @@ static const struct vertex *add_vertex(struct path *path, double x, double y,
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}
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/*
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* "corner" replaces a corner with a ploygon if the corner is too sharp to
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* be within distance "d" of the bend radius. This may change the point from
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* where we resume drawing (originally the corner point, "b"). "corner"
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* therefore returns the new end of the arc.
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*/
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static const struct vertex *corner(struct path *path, const struct vertex *a,
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const struct vertex *b, const struct vertex *c, double r, double d)
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{
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@ -230,17 +249,29 @@ static const struct vertex *corner(struct path *path, const struct vertex *a,
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n = (int) ceil((t2-2*(p+q))/(2*q));
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/*
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* @@@ We should evenly distribute the slack and try to pick a
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* We could evenly distribute the slack and try to pick a
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* smaller value for d, but that seems difficult.
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*
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* A drawback of reducing p would be that we may make the
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* corner unnecessarily sharp, possibly even turning against
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* the general direction of the turn. We'd still respect the
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* bend radius and the tolerance, but the result may look weird
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* anyway.
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*
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* For now, we just center the polygon.
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*/
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q = (t2/2-p)/(n+1);
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if (n)
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ang = p+q;
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else
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else {
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ang = t2/2;
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/*
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* @@@ To do: adjust the radius such that we always hug
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* the r-d circle (see arc.fig) and usually not the
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* r+d circle. Right now, it's just the opposite.
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*/
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}
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u = tan(p)*(r-d);
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v = tan(q)*(r-d);
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@ -1,3 +1,15 @@
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/*
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* path.h - 2D path operations
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef PATH_H
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#define PATH_H
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@ -1,3 +1,15 @@
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/*
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* ptrude.c - Extrusion of a 2D path along a perpendicular 2D path
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdio.h>
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#include "path.h"
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