Datasets:
shibing624
/
source_code

Dataset card Data Studio Files Community
2
text
stringlengths
0
2.2M
cont.nverts = 0;
int startX = x;
int startY = y;
int startDir = -1;
for (int i = 0; i < 4; ++i)
{
const int dir = (i+3)&3;
unsigned char rn = getNeighbourReg(layer, x, y, dir);
if (rn != layer.regs[x+y*w])
{
startDir = dir;
break;
}
}
if (startDir == -1)
return true;
int dir = startDir;
const int maxIter = w*h;
int iter = 0;
while (iter < maxIter)
{
unsigned char rn = getNeighbourReg(layer, x, y, dir);
int nx = x;
int ny = y;
int ndir = dir;
if (rn != layer.regs[x+y*w])
{
// Solid edge.
int px = x;
int pz = y;
switch(dir)
{
case 0: pz++; break;
case 1: px++; pz++; break;
case 2: px++; break;
}
// Try to merge with previous vertex.
if (!appendVertex(cont, px, (int)layer.heights[x+y*w], pz,rn))
return false;
ndir = (dir+1) & 0x3; // Rotate CW
}
else
{
// Move to next.
nx = x + getDirOffsetX(dir);
ny = y + getDirOffsetY(dir);
ndir = (dir+3) & 0x3; // Rotate CCW
}
if (iter > 0 && x == startX && y == startY && dir == startDir)
break;
x = nx;
y = ny;
dir = ndir;
iter++;
}
// Remove last vertex if it is duplicate of the first one.
unsigned char* pa = &cont.verts[(cont.nverts-1)*4];
unsigned char* pb = &cont.verts[0];
if (pa[0] == pb[0] && pa[2] == pb[2])
cont.nverts--;
return true;
}
static float distancePtSeg(const int x, const int z,
const int px, const int pz,
const int qx, const int qz)
{
float pqx = (float)(qx - px);
float pqz = (float)(qz - pz);
float dx = (float)(x - px);
float dz = (float)(z - pz);
float d = pqx*pqx + pqz*pqz;
float t = pqx*dx + pqz*dz;
if (d > 0)
t /= d;
if (t < 0)
t = 0;
else if (t > 1)
t = 1;
dx = px + t*pqx - x;
dz = pz + t*pqz - z;
return dx*dx + dz*dz;
}