/**
* @brief Generate shear transformation matrix
* @param m Generated matrix
* @param shx
* @param shy
* @return void
*
* | 0 shy 0 |
* m = | shx 0 0 |
* | 0 0 1 |
*/
extern void
dmtxMatrix3Shear(DmtxMatrix3 m, double shx, double shy)
{
dmtxMatrix3Identity(m);
m[1][0] = shx;
m[0][1] = shy;
}
/**
* @brief Generate scale transformation matrix
* @param m Generated matrix
* @param sx
* @param sy
* @return void
*
* | sx 0 0 |
* m = | 0 sy 0 |
* | 0 0 1 |
*
* Transform "m"
* _____ (0,sy) x-------o (sx,sy)
* \ | | |
* (0,1) x----o / | (0,1) +----+ |
* | | / /\| | | |
* | | \ / | | |
* +----* ` +----+--*
* (0,0) (1,0) (0,0) (sx,0)
*
*/
extern void
dmtxMatrix3Scale(DmtxMatrix3 m, double sx, double sy)
{
dmtxMatrix3Identity(m);
m[0][0] = sx;
m[1][1] = sy;
}
/**
* \brief Initialize encode struct with default values
* \return Initialized DmtxEncode struct
*/
extern DmtxEncode *
dmtxEncodeCreate(void)
{
DmtxEncode *enc;
enc = (DmtxEncode *)calloc(1, sizeof(DmtxEncode));
if(enc == NULL)
return NULL;
enc->scheme = DmtxSchemeAscii;
enc->sizeIdxRequest = DmtxSymbolSquareAuto;
enc->marginSize = 10;
enc->moduleSize = 5;
enc->pixelPacking = DmtxPack24bppRGB;
enc->imageFlip = DmtxFlipNone;
enc->rowPadBytes = 0;
enc->fnc1 = DmtxUndefined;
/* Initialize background color to white */
/* enc.region.gradient.ray.p.R = 255.0;
enc.region.gradient.ray.p.G = 255.0;
enc.region.gradient.ray.p.B = 255.0; */
/* Initialize foreground color to black */
/* enc.region.gradient.tMin = 0.0;
enc.region.gradient.tMax = xyz; */
dmtxMatrix3Identity(enc->xfrm);
return enc;
}
/**
* @brief Generate side line skew transformation (inverse)
* @param m
* @param b0
* @param b1
* @param sz
* @return void
*/
extern void
dmtxMatrix3LineSkewSideInv(DmtxMatrix3 m, double b0, double b1, double sz)
{
assert(b1 >= DmtxAlmostZero);
dmtxMatrix3Identity(m);
m[0][0] = b0/sz;
m[1][1] = b0/b1;
m[1][2] = (b0 - b1)/(sz*b1);
}
/**
* @brief Generate side line skew transformation
* @param m
* @param b0
* @param b1
* @param sz
* @return void
*/
extern void
dmtxMatrix3LineSkewSide(DmtxMatrix3 m, double b0, double b1, double sz)
{
assert(b0 >= DmtxAlmostZero);
dmtxMatrix3Identity(m);
m[0][0] = sz/b0;
m[1][1] = b1/b0;
m[1][2] = (b1 - b0)/(sz*b0);
}
/**
* @brief Generate rotate transformation
* @param m Generated matrix
* @param angle
* @return void
*
* | cos(a) sin(a) 0 |
* m = | -sin(a) cos(a) 0 |
* | 0 0 1 |
* o
* Transform "m" / `
* ___ / `
* (0,1) x----o |/ \ x * (cos(a),sin(a))
* | | '-- | ` /
* | | ___/ ` / a
* +----* `+ - - - - - -
* (0,0) (1,0) (0,0)
*
*/
extern void
dmtxMatrix3Rotate(DmtxMatrix3 m, double angle)
{
double sinAngle, cosAngle;
sinAngle = sin(angle);
cosAngle = cos(angle);
dmtxMatrix3Identity(m);
m[0][0] = cosAngle;
m[0][1] = sinAngle;
m[1][0] = -sinAngle;
m[1][1] = cosAngle;
}
/**
* @brief Generate translate transformation matrix
* @param m Generated matrix
* @param tx
* @param ty
* @return void
*
* | 1 0 0 |
* m = | 0 1 0 |
* | tx ty 1 |
*
* Transform "m"
* _____ (tx,1+ty) x----o (1+tx,1+ty)
* \ | | |
* (0,1) x----o / | (0,1) +-|--+ |
* | | / /\| | +----* (1+tx,ty)
* | | \ / | |
* +----* ` +----+
* (0,0) (1,0) (0,0) (1,0)
*
*/
void dmtxMatrix3Translate(DmtxMatrix3 m, double tx, double ty)
{
dmtxMatrix3Identity(m);
m[2][0] = tx;
m[2][1] = ty;
}
