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avoid winding-rule calls via function pointer

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Signed-off-by: Jeff Epler <jepler@unpythonic.net>
This commit is contained in:
Jeff Epler 2017-06-02 16:06:29 -05:00
parent 386d98d587
commit b209a5bd09
1 changed files with 15 additions and 9 deletions
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24
main.cc
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@ -40,12 +40,18 @@ void usage() {
typedef bool(*winding_rule)(int);
winding_rule find_rule(const char *arg) {
if(!strcmp(arg, "odd")) return [](int i) { return i % 2 != 0; };
if(!strcmp(arg, "nonzero")) return [](int i) { return i != 0; };
if(!strcmp(arg, "positive")) return [](int i) { return i > 0; };
if(!strcmp(arg, "negative")) return [](int i) { return i < 0; };
if(!strcmp(arg, "abs_geq_two")) return [](int i) { return abs(i) >= 2; };
template<class C, class Cb>
void xyhatch(const HatchPattern &pattern, const C &c, Cb cb, const char *arg) {
if(!strcmp(arg, "odd"))
return xyhatch(pattern, c, cb, [](int i) { return i % 2 != 0; });
if(!strcmp(arg, "nonzero"))
return xyhatch(pattern, c, cb, [](int i) { return i != 0; });
if(!strcmp(arg, "positive"))
return xyhatch(pattern, c, cb, [](int i) { return i > 0; });
if(!strcmp(arg, "negative"))
return xyhatch(pattern, c, cb, [](int i) { return i < 0; });
if(!strcmp(arg, "abs_geq_two"))
return xyhatch(pattern, c, cb, [](int i) { return abs(i) >= 2; });
fprintf(stderr, "Unrecognized winding rule '%s'\n", arg);
fprintf(stderr, "Rules are: odd nonzero positive negative abs_geq_two\n");
usage();
@ -53,12 +59,12 @@ winding_rule find_rule(const char *arg) {
int main(int argc, char **argv) {
auto scale = 1., jitter = 0.;
auto rule = find_rule("odd");
auto rule = "odd";
bool bench = false, xit = false;
int c;
while((c = getopt(argc, argv, "bxs:j:r:")) > 0) {
switch(c) {
case 'r': rule = find_rule(optarg); break;
case 'r': rule = optarg; break;
case 'b': bench = !bench; break;
case 'x': xit = !xit; break;
case 's': scale = atof(optarg); break;
@ -81,7 +87,7 @@ int main(int argc, char **argv) {
if(bench) {
int nseg = 0;
auto print_seg = [&nseg](const Segment &s) { (void)s; nseg ++; };
xyhatch(h, s, print_seg, rule);
xyhatch(h, s, print_seg, [](int i) { return i != 0; } );
std::cout << nseg << "\n";
return 0;
}