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vector graphics editor now can calculate areas

This commit is contained in:
Zeno Rogue 2018-08-28 05:39:41 +02:00
parent c17efce3b5
commit 114fd59752
1 changed files with 40 additions and 0 deletions
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40
mapeditor.cpp
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@ -962,6 +962,37 @@ namespace mapeditor {
0x804000FF
};
#endif
bool area_in_pi = false;
ld compute_area(hpcshape& sh) {
ld area = 0;
for(int i=sh.s; i<sh.e-1; i++) {
hyperpoint h1 = hpc[i];
hyperpoint h2 = hpc[i+1];
if(euclid)
area += (h2[1] + h1[1]) * (h2[0] - h1[0]) / 2;
else {
hyperpoint rh2 = gpushxto0(h1) * h2;
hyperpoint rh1 = gpushxto0(h2) * h1;
// ld a1 = atan2(h1[1], h1[0]);
// ld a2 = atan2(h2[1], h2[0]);
ld b1 = atan2(rh1[1], rh1[0]);
ld b2 = atan2(rh2[1], rh2[0]);
// C0 -> H1 -> H2 -> C0
// at C0: (a1-a2)
// at H1: (rh2 - a1 - M_PI)
// at H2: (a2+M_PI - rh1)
// total: rh2 - rh1
// ld z = 180 / M_PI;
ld x = b2 - b1 + M_PI;
while(x > M_PI) x -= 2 * M_PI;
while(x < -M_PI) x += 2 * M_PI;
area += x;
}
}
return area;
}
void showDrawEditor() {
cmode = sm::DRAW;
@ -1106,6 +1137,13 @@ namespace mapeditor {
displayfr(vid.xres-8, vid.yres-8-fs*2, 2, vid.fsize, XLAT("r: %1", fts4(hdist0(mh))), 0xC0C0C0, 16);
displayfr(vid.xres-8, vid.yres-8-fs, 2, vid.fsize, XLAT("ϕ: %1°", fts4(-atan2(mh[1], mh[0]) * 360 / 2 / M_PI)), 0xC0C0C0, 16);
}
if(us) {
auto& sh = us->d[dslayer].sh;
if(sh.e >= sh.s + 3)
displayButton(vid.xres-8, vid.yres-8-fs*8, XLAT("area: %1", area_in_pi ? fts4(compute_area(sh) / M_PI) + "π" : fts4(compute_area(sh))), 'w', 16);
}
displayFunctionKeys();
@ -1418,6 +1456,8 @@ namespace mapeditor {
mousekey = newmousekey;
}
if(uni == 'w') area_in_pi = !area_in_pi;
if(uni == 'r') {
pushScreen(patterns::showPattern);
if(drawplayer)