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AngusJohnsonAngusJohnson
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Updated 'UsingZ' C++ example
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-25
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2 files changed

+110
-25
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‎CPP/Examples/UsingZ/UsingZ.cpp‎

Lines changed: 105 additions & 23 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,13 @@
11

22
#include <cstdlib>
3+
#include <cstdint>
4+
#include <cmath>
5+
#include <string>
6+
#include <functional>
37
#include "clipper2/clipper.h"
8+
#include "clipper2/clipper.core.h"
9+
#include "clipper2/clipper.engine.h"
10+
#include "clipper2/clipper.triangulation.h"
411
#include "../../Utils/clipper.svg.h"
512
#include "../../Utils/clipper.svg.utils.h"
613

@@ -9,8 +16,9 @@ using namespace Clipper2Lib;
916

1017

1118
void System(const std::string &filename);
12-
void TestingZ_Int64();
13-
void TestingZ_Double();
19+
void Test1_64();
20+
void Test1_Double();
21+
void Test2_Double();
1422

1523
// use the Z callback to flag intersections by setting z = 1;
1624

@@ -34,11 +42,77 @@ class MyClass {
3442

3543
int main(int argc, char* argv[])
3644
{
37-
//TestingZ_Int64();
38-
TestingZ_Double();
45+
Test1_64();
46+
Test1_Double();
47+
Test2_Double();
3948
}
4049

41-
void TestingZ_Int64()
50+
static uint32_t ByteToRainbowColor(uint8_t b)
51+
{
52+
uint8_t b2;
53+
switch (b / 43)
54+
{
55+
//0..42
56+
case 0: b2 = (b - 0) * 6; return 0xFFFF0000 | (b2 << 8); // 0xFFFF0000 -> 0xFFFFFF00 (red..yellow)
57+
//43..85
58+
case 1: b2 = (85 - b) * 6; return 0xFF00FF00 | (b2 << 16); // 0xFFFFFF00 -> 0xFF00FF00 (yellow..lime)
59+
//86..128
60+
case 2: b2 = (b - 86) * 6; return 0xFF00FF00 | b2; // 0xFF00FF00 -> 0xFF00FFFF (lime..aqua)
61+
//129..171
62+
case 3: b2 = (171 - b) * 6; return 0xFF0000FF | (b2 << 8); // 0xFF00FFFF -> 0xFF0000FF (aqua..blue)
63+
//172..214
64+
case 4: b2 = (b - 172) * 6; return 0xFF0000FF | (b2 << 16); // 0xFF0000FF -> 0xFFFF00FF (blue..fuschia)
65+
//215..255
66+
default: b2 = (255 - b) * 6; return 0xFFFF0000 | b2; // 0xFF0000FF -> 0xFFFF00FF (fuschia..red)
67+
}
68+
}
69+
70+
static void DisplayAsSvg(const string& filename,
71+
const Paths64* subject, const Paths64* clip, const Paths64* solution)
72+
{
73+
SvgWriter svg;
74+
if (subject)
75+
SvgAddSubject(svg, *subject, FillRule::NonZero);
76+
if (clip)
77+
SvgAddClip(svg, *clip, FillRule::NonZero);
78+
if (solution)
79+
SvgAddSolution(svg, *solution, FillRule::NonZero, false);
80+
SvgSaveToFile(svg, filename, 320, 320, 0);
81+
System(filename);
82+
}
83+
84+
static void DisplayAsSvg(const string& filename,
85+
const PathsD* subject, const PathsD* clip, const PathsD* solution, bool multi_color = false)
86+
{
87+
SvgWriter svg;
88+
if (subject)
89+
SvgAddSubject(svg, *subject, FillRule::NonZero);
90+
if (clip)
91+
SvgAddClip(svg, *clip, FillRule::NonZero);
92+
if (solution)
93+
{
94+
if (multi_color)
95+
{
96+
#ifdef USINGZ
97+
for (const PathD& path : *solution)
98+
{
99+
// set color using the average 'z' for each triangle
100+
uint8_t d = (path.size() == 3) ? (path[0].z + path[1].z + path[2].z) / 3.0 : 128;
101+
svg.AddPath(path, false, FillRule::NonZero, ByteToRainbowColor(d), 0x80808080, 0.8, false);
102+
}
103+
#else
104+
// just set a random color
105+
SvgAddRCSolution(svg, *solution, FillRule::NonZero, false);
106+
#endif
107+
}
108+
else
109+
SvgAddSolution(svg, *solution, FillRule::NonZero, false);
110+
}
111+
SvgSaveToFile(svg, filename, 320, 320, 0);
112+
System(filename);
113+
}
114+
115+
void Test1_64()
42116
{
43117

44118
Paths64 subject, solution;
@@ -53,24 +127,21 @@ void TestingZ_Int64()
53127
std::placeholders::_4, std::placeholders::_5));
54128
c64.Execute(ClipType::Union, FillRule::NonZero, solution);
55129

56-
SvgWriter svg;
57-
SvgAddSolution(svg, solution, FillRule::NonZero, false);
58-
if (solution.size() > 0) {
130+
Paths64 ellipses;
131+
if (solution.size() > 0)
132+
{
59133
// draw circles around intersection points - flagged by z == 1
60-
PathsD ellipses;
61134
double r = 3.0;
62135
for (const Point64& pt : solution[0])
63136
if (pt.z == 1)
64137
{
65-
ellipses.push_back(Ellipse(RectD(pt.x - r, pt.y - r, pt.x + r, pt.y + r), 11));
138+
ellipses.push_back(Ellipse(Rect64(pt.x - r, pt.y - r, pt.x + r, pt.y + r), 11));
66139
}
67-
SvgAddClip(svg, ellipses, FillRule::NonZero);
68140
}
69-
SvgSaveToFile(svg, "usingz_int64.svg", 800, 600, 20);
70-
System("usingz_int64.svg");
141+
DisplayAsSvg("TestingZ1_64.svg", &subject, &ellipses, &solution);
71142
}
72143

73-
void TestingZ_Double()
144+
void Test1_Double()
74145
{
75146
PathsD subject, solution;
76147
MyClass mc;
@@ -84,22 +155,33 @@ void TestingZ_Double()
84155
std::placeholders::_4, std::placeholders::_5));
85156
c.Execute(ClipType::Union, FillRule::NonZero, solution);
86157

87-
SvgWriter svg;
88-
SvgAddSubject(svg, subject, FillRule::NonZero);
89-
if (solution.size() > 0)
158+
PathsD ellipses;
159+
if (solution.size() > 0)
90160
{
91161
// draw circles around intersection points
92-
PathsD ellipses;
93162
double r = 3.0;
94163
for (const PointD& pt : solution[0])
95164
if (pt.z == 1)
96-
ellipses.push_back(Ellipse(RectD(pt.x - r, pt.y - r,
165+
ellipses.push_back(Ellipse(RectD(pt.x - r, pt.y - r,
97166
pt.x + r, pt.y + r), 11));
98-
99-
SvgAddSolution(svg, ellipses, FillRule::NonZero, false);
100167
}
101-
SvgSaveToFile(svg, "usingz_double.svg", 320, 320, 0);
102-
System("usingz_double.svg");
168+
DisplayAsSvg("TestingZ1_D.svg", &subject, &ellipses, &solution, false);
169+
}
170+
171+
void Test2_Double()
172+
{
173+
SvgReader sr = SvgReader(".\\TriSamples\\coral3.svg");
174+
PathsD subject = sr.paths, sol;
175+
RectD r = GetBounds(subject);
176+
PointD mp = r.MidPoint();
177+
double d = (mp.y - r.top) / 255;
178+
// for each point in subject set, 'z' as the distance fron 'mp'
179+
// relative to 'd' and then scale to 255
180+
for (PathD& path : subject)
181+
for (PointD& pt : path)
182+
pt.z = std::sqrt(DistanceSqr(pt, mp)) / d;
183+
Triangulate(subject, 0, sol, true);
184+
DisplayAsSvg("coral3_t2.svg", nullptr, nullptr, &sol, true);
103185
}
104186

105187
void System(const std::string &filename)

‎CPP/Utils/clipper.svg.utils.h‎

Lines changed: 5 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -10,8 +10,11 @@
1010
#define svgutillib_h
1111

1212
#include <cstdlib>
13+
#include <cstdint>
14+
#include <cstdio>
1315
#include <string>
1416
#include "clipper2/clipper.h"
17+
#include "clipper2/clipper.core.h"
1518
#include "clipper.svg.h"
1619
#ifndef _WIN32
1720
#include <sys/types.h>
@@ -114,7 +117,7 @@ namespace Clipper2Lib {
114117
// SvgAddRCSolution - random color for each individual polygon (eg when triangulating)
115118
inline void SvgAddRCSolution(SvgWriter& svg, const PathsD& paths, FillRule fillrule, bool show_coords)
116119
{
117-
for (auto path : paths)
120+
for (const PathD& path : paths)
118121
svg.AddPath(path, false, fillrule, RandomColor(), 0xFF999999, 1.0, show_coords);
119122
}
120123

@@ -128,7 +131,7 @@ namespace Clipper2Lib {
128131
// SvgAddRCSolution - random color for each individual polygon (eg when triangulating)
129132
inline void SvgAddRCSolution(SvgWriter& svg, const Paths64& paths, FillRule fillrule, bool show_coords)
130133
{
131-
for (auto path : paths)
134+
for (const Path64& path : paths)
132135
{
133136
svg.AddPath(TransformPath<double, int64_t>(path),
134137
false, fillrule, RandomColor(), 0xFF999999, 1.0, show_coords);

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