mirror of https://github.com/axmolengine/axmol.git
356 lines
11 KiB
C++
356 lines
11 KiB
C++
/****************************************************************************
|
|
Copyright (c) 2008-2010 Ricardo Quesada
|
|
Copyright (c) 2010-2012 cocos2d-x.org
|
|
Copyright (c) 2011 Zynga Inc.
|
|
Copyright (c) 2013-2014 Chukong Technologies Inc.
|
|
|
|
http://www.cocos2d-x.org
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
THE SOFTWARE.
|
|
****************************************************************************/
|
|
|
|
#include "MarchingSquare.h"
|
|
#include "cocos2d.h"
|
|
#include <algorithm>
|
|
|
|
USING_NS_CC;
|
|
|
|
MarchingSquare::MarchingSquare(const std::string &filename, const unsigned int threshold)
|
|
{
|
|
_filename = filename;
|
|
_threshold = threshold;
|
|
Image *image = new Image();
|
|
image->initWithImageFile(filename);
|
|
CCASSERT(image->getRenderFormat()==Texture2D::PixelFormat::RGBA8888, "unsupported format, currently only supports rgba8888");
|
|
data = image->getData();
|
|
width = image->getWidth();
|
|
height = image->getHeight();
|
|
scaleFactor = Director::getInstance()->getContentScaleFactor();
|
|
}
|
|
|
|
void MarchingSquare::trace()
|
|
{
|
|
unsigned int first = findFirstNoneTransparentPixel();
|
|
start = Vec2(first%width, first/width);
|
|
marchSquare(start.x, start.y);
|
|
}
|
|
|
|
unsigned int MarchingSquare::findFirstNoneTransparentPixel()
|
|
{
|
|
for(unsigned int i = 0; i < width*height; i++)
|
|
{
|
|
if(getAlphaAt(i) > _threshold)
|
|
{
|
|
// CCLOG("first non transparent is at x:%d, y%d", i%width, i/width);
|
|
return i;
|
|
}
|
|
}
|
|
CCASSERT(false, "image is all transparent!");
|
|
}
|
|
|
|
unsigned char MarchingSquare::getAlphaAt(const unsigned int i)
|
|
{
|
|
return *(data+i*4+3);
|
|
}
|
|
unsigned char MarchingSquare::getAlphaAt(const int x, const int y)
|
|
{
|
|
if(x < 0 || y < 0 || x > width-1 || y > height-1)
|
|
return 0;
|
|
return *(data+(y*width+x)*4+3);
|
|
}
|
|
|
|
unsigned int MarchingSquare::getSquareValue(int x, int y)
|
|
{
|
|
/*
|
|
checking the 2x2 pixel grid, assigning these values to each pixel, if not transparent
|
|
+---+---+
|
|
| 1 | 2 |
|
|
+---+---+
|
|
| 4 | 8 | <- current pixel (curx,cury)
|
|
+---+---+
|
|
*/
|
|
unsigned int sv = 0;
|
|
if(getAlphaAt(x-1, y-1) > _threshold)
|
|
sv += 1;
|
|
if(getAlphaAt(x,y-1) > _threshold)
|
|
sv += 2;
|
|
if(getAlphaAt(x-1, y) > _threshold)
|
|
sv += 4;
|
|
if(getAlphaAt(x, y) > _threshold)
|
|
sv += 8;
|
|
return sv;
|
|
}
|
|
|
|
void MarchingSquare::marchSquare(int startx, int starty)
|
|
{
|
|
int stepx = 0;
|
|
int stepy = 0;
|
|
int prevx = 0;
|
|
int prevy = 0;
|
|
int curx = startx;
|
|
int cury = starty;
|
|
unsigned int count = 0;
|
|
unsigned int totalPixel = width*height;
|
|
bool problem = false;
|
|
std::vector<int> case9s;
|
|
std::vector<int> case6s;
|
|
int i;
|
|
std::vector<int>::iterator it;
|
|
do{
|
|
int sv = getSquareValue(curx, cury);
|
|
switch(sv){
|
|
|
|
case 1:
|
|
case 5:
|
|
case 13:
|
|
/* going UP with these cases:
|
|
1 5 13
|
|
+---+---+ +---+---+ +---+---+
|
|
| 1 | | | 1 | | | 1 | |
|
|
+---+---+ +---+---+ +---+---+
|
|
| | | | 4 | | | 4 | 8 |
|
|
+---+---+ +---+---+ +---+---+
|
|
*/
|
|
stepx = 0;
|
|
stepy = -1;
|
|
break;
|
|
|
|
|
|
case 8:
|
|
case 10:
|
|
case 11:
|
|
/* going DOWN with these cases:
|
|
8 10 11
|
|
+---+---+ +---+---+ +---+---+
|
|
| | | | | 2 | | 1 | 2 |
|
|
+---+---+ +---+---+ +---+---+
|
|
| | 8 | | | 8 | | | 8 |
|
|
+---+---+ +---+---+ +---+---+
|
|
*/
|
|
stepx = 0;
|
|
stepy = 1;
|
|
break;
|
|
|
|
|
|
case 4:
|
|
case 12:
|
|
case 14:
|
|
/* going LEFT with these cases:
|
|
4 12 14
|
|
+---+---+ +---+---+ +---+---+
|
|
| | | | | | | | 2 |
|
|
+---+---+ +---+---+ +---+---+
|
|
| 4 | | | 4 | 8 | | 4 | 8 |
|
|
+---+---+ +---+---+ +---+---+
|
|
*/
|
|
stepx = -1;
|
|
stepy = 0;
|
|
break;
|
|
|
|
|
|
case 2 :
|
|
case 3 :
|
|
case 7 :
|
|
/* going RIGHT with these cases:
|
|
2 3 7
|
|
+---+---+ +---+---+ +---+---+
|
|
| | 2 | | 1 | 2 | | 1 | 2 |
|
|
+---+---+ +---+---+ +---+---+
|
|
| | | | | | | 4 | |
|
|
+---+---+ +---+---+ +---+---+
|
|
*/
|
|
stepx=1;
|
|
stepy=0;
|
|
break;
|
|
case 9 :
|
|
/*
|
|
+---+---+
|
|
| 1 | |
|
|
+---+---+
|
|
| | 8 |
|
|
+---+---+
|
|
this should normaly go UP, but if we already been here, we go down
|
|
*/
|
|
//find index from xy;
|
|
i = getIndexFromPos(curx, cury);
|
|
it = find (case9s.begin(), case9s.end(), i);
|
|
if (it != case9s.end())
|
|
{
|
|
//found, so we go down, and delete from case9s;
|
|
stepx = 0;
|
|
stepy = 1;
|
|
case9s.erase(it);
|
|
problem = true;
|
|
}
|
|
else
|
|
{
|
|
//not found, we go up, and add to case9s;
|
|
stepx = 0;
|
|
stepy = -1;
|
|
case9s.push_back(i);
|
|
}
|
|
break;
|
|
case 6 :
|
|
/*
|
|
6
|
|
+---+---+
|
|
| | 2 |
|
|
+---+---+
|
|
| 4 | |
|
|
+---+---+
|
|
this normally go RIGHT, but if its coming from UP, it should go LEFT
|
|
*/
|
|
i = getIndexFromPos(curx, cury);
|
|
it = find (case6s.begin(), case6s.end(), i);
|
|
if (it != case6s.end())
|
|
{
|
|
//found, so we go down, and delete from case9s;
|
|
stepx = -1;
|
|
stepy = 0;
|
|
case6s.erase(it);
|
|
problem = true;
|
|
}
|
|
else{
|
|
//not found, we go up, and add to case9s;
|
|
stepx = 1;
|
|
stepy = 0;
|
|
case6s.push_back(i);
|
|
}
|
|
break;
|
|
case 0:
|
|
CCLOG("case 0 at x:%d, y:%d, coming from %d, %d", curx, cury, prevx, prevy);
|
|
CCASSERT(false, "this shoudln't happen");
|
|
break;
|
|
case 15:
|
|
CCLOG("case 15 at x:%d, y:%d, coming from %d, %d", curx, cury, prevx, prevy);
|
|
CCASSERT(false, "this shoudln't happen");
|
|
break;
|
|
|
|
}
|
|
//little optimization
|
|
// if previous direction is same as current direction,
|
|
// then we should modify the last vec to current
|
|
curx += stepx;
|
|
cury += stepy;
|
|
if(stepx == prevx && stepy == prevy)
|
|
{
|
|
points.back().x = (float)(curx) / scaleFactor;
|
|
points.back().y = (float)(height-cury) / scaleFactor;
|
|
}
|
|
else if(problem)
|
|
{
|
|
//TODO: we triangulation cannot work collineer points, so we need to modify same point a little
|
|
//TODO: maybe we can detect if we go into a hole and coming back the hole, we should extract those points and remove them
|
|
points.back().x -= 0.00001;
|
|
points.back().y -= 0.00001;
|
|
points.push_back(Vec2((float)curx, (float)height-cury)/ scaleFactor);
|
|
}
|
|
else{
|
|
points.push_back(Vec2((float)curx, (float)height-cury)/ scaleFactor);
|
|
}
|
|
|
|
count++;
|
|
prevx = stepx;
|
|
prevy = stepy;
|
|
problem = false;
|
|
CCASSERT(count <= totalPixel, "oh no, marching square cannot find starting position");
|
|
} while(curx != startx || cury != starty);
|
|
}
|
|
|
|
void MarchingSquare::printPoints()
|
|
{
|
|
for(auto p : points)
|
|
{
|
|
CCLOG("%.1f %.1f", p.x, height-p.y);
|
|
}
|
|
}
|
|
|
|
float MarchingSquare::perpendicularDistance(cocos2d::Vec2 ii, cocos2d::Vec2 ss, cocos2d::Vec2 ee)
|
|
{
|
|
float res;
|
|
float slope;
|
|
float intercept;
|
|
|
|
if(ss.x == ee.x)
|
|
{
|
|
res = fabsf(ii.x- ee.x);
|
|
}
|
|
else if (ss.y == ee.y)
|
|
{
|
|
res = fabsf(ii.y - ee.y);
|
|
}
|
|
else{
|
|
slope = (ee.y - ss.y) / (ee.x - ss.x);
|
|
intercept = ss.y - (slope*ss.x);
|
|
res = fabsf(slope * ii.x - ii.y + intercept) / sqrtf(powf(slope, 2)+1);
|
|
}
|
|
return res;
|
|
}
|
|
std::vector<cocos2d::Vec2> MarchingSquare::rdp(std::vector<cocos2d::Vec2> v)
|
|
{
|
|
if(v.size() < 3)
|
|
return v;
|
|
|
|
int index = -1;
|
|
float dist = 0;
|
|
//not looping first and last point
|
|
for(int i = 1; i < v.size()-1; i++)
|
|
{
|
|
float cdist = perpendicularDistance(v[i], v.front(), v.back());
|
|
if(cdist > dist)
|
|
{
|
|
dist = cdist;
|
|
index = i;
|
|
}
|
|
}
|
|
if (dist>epsilon)
|
|
{
|
|
std::vector<Vec2>::const_iterator begin = v.begin();
|
|
std::vector<Vec2>::const_iterator end = v.end();
|
|
std::vector<Vec2> l1(begin, begin+index+1);
|
|
std::vector<Vec2> l2(begin+index, end);
|
|
|
|
std::vector<Vec2> r1 = rdp(l1);
|
|
std::vector<Vec2> r2 = rdp(l2);
|
|
|
|
r1.insert(r1.end(), r2.begin()+1, r2.end());
|
|
return r1;
|
|
}
|
|
else {
|
|
std::vector<Vec2> ret;
|
|
ret.push_back(v.front());
|
|
ret.push_back(v.back());
|
|
return ret;
|
|
}
|
|
}
|
|
void MarchingSquare::optimize(float level)
|
|
{
|
|
if(level <= 0 || points.size()<4)
|
|
return;
|
|
epsilon = level;
|
|
points = rdp(points);
|
|
auto last = points.back();
|
|
|
|
if(last.y > points.front().y)
|
|
points.front().y = last.y;
|
|
points.pop_back();
|
|
|
|
//delete the last point, because its almost the same as the starting point
|
|
// CCLOG("%.1f, %.1f, %.1f, %.1f", points[0].x, points[0].y, points.back().x, points.back().y);
|
|
} |