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#include "lineTransformer.h"
void lineTransformer::drawWarpFrame(glm::vec2 warpframe[4]){
ofSetColor(255,255,255);
ofNoFill();
for (int i=0;i<4;i++){
ofDrawCircle(warpframe[i],25);
ofDrawLine(warpframe[i],warpframe[(i+1)%4]);
}
}
void lineTransformer::gaussianElimination(float * input, int n)
{
auto i = 0;
auto j = 0;
auto m = n - 1;
while (i < m && j < n)
{
auto iMax = i;
for (auto k = i + 1; k < m; ++k)
{
if (fabs(input[k * n + j]) > fabs(input[iMax * n + j]))
{
iMax = k;
}
}
if (input[iMax * n + j] != 0)
{
if (i != iMax)
{
for (auto k = 0; k < n; ++k)
{
auto ikIn = input[i * n + k];
input[i * n + k] = input[iMax * n + k];
input[iMax * n + k] = ikIn;
}
}
float ijIn = input[i * n + j];
for (auto k = 0; k < n; ++k)
{
input[i * n + k] /= ijIn;
}
for (auto u = i + 1; u < m; ++u)
{
auto ujIn = input[u * n + j];
for (auto k = 0; k < n; ++k)
{
input[u * n + k] -= ujIn * input[i * n + k];
}
}
++i;
}
++j;
}
for (auto i = m - 2; i >= 0; --i)
{
for (auto j = i + 1; j < n - 1; ++j)
{
input[i * n + m] -= input[i * n + j] * input[j * n + m];
}
}
}
glm::mat4 lineTransformer::getPerspectiveTransformMatrix(const glm::vec2 src[4], const glm::vec2 dst[4])
{
float p[8][9] =
{
{ -src[0][0], -src[0][1], -1, 0, 0, 0, src[0][0] * dst[0][0], src[0][1] * dst[0][0], -dst[0][0] }, // h11
{ 0, 0, 0, -src[0][0], -src[0][1], -1, src[0][0] * dst[0][1], src[0][1] * dst[0][1], -dst[0][1] }, // h12
{ -src[1][0], -src[1][1], -1, 0, 0, 0, src[1][0] * dst[1][0], src[1][1] * dst[1][0], -dst[1][0] }, // h13
{ 0, 0, 0, -src[1][0], -src[1][1], -1, src[1][0] * dst[1][1], src[1][1] * dst[1][1], -dst[1][1] }, // h21
{ -src[2][0], -src[2][1], -1, 0, 0, 0, src[2][0] * dst[2][0], src[2][1] * dst[2][0], -dst[2][0] }, // h22
{ 0, 0, 0, -src[2][0], -src[2][1], -1, src[2][0] * dst[2][1], src[2][1] * dst[2][1], -dst[2][1] }, // h23
{ -src[3][0], -src[3][1], -1, 0, 0, 0, src[3][0] * dst[3][0], src[3][1] * dst[3][0], -dst[3][0] }, // h31
{ 0, 0, 0, -src[3][0], -src[3][1], -1, src[3][0] * dst[3][1], src[3][1] * dst[3][1], -dst[3][1] }, // h32
};
gaussianElimination(&p[0][0], 9);
return glm::mat4(p[0][8], p[3][8], 0, p[6][8],
p[1][8], p[4][8], 0, p[7][8],
0, 0, 1, 0,
p[2][8], p[5][8], 0, 1);
}
ofPolyline lineTransformer::polyLineTransform(const ofMatrix4x4 xform, const ofPolyline& poly){
ofPolyline tempPoly;
for (auto& p:poly){
tempPoly.addVertex(ofVec3f(p)*xform);
}
return tempPoly;
}
colourPolyline lineTransformer::polyLineTransform(const ofMatrix4x4 xform,colourPolyline& poly,float colourFade){
colourPolyline tempPoly;
for (int i=0;i<poly.size();i++){
tempPoly.addVertex(ofVec3f(poly[i])*xform,poly.getColourAt(i)*colourFade);
}
return tempPoly;
}
ofPolyline lineTransformer::makePolygon(int num,float diam){
ofPolyline poly;
float step=PI*2/num;
for (int i=0;i<=num;i++){
poly.addVertex(cos(step*i)*diam,sin(step*i)*diam);
}
return poly;
}
void lineTransformer::drawPoly(ofPolyline poly,float x,float y){
glPushMatrix();
ofTranslate(x,y);
poly.draw();
for (int i=0;i<poly.size();i++){
ofDrawBitmapString(poly.getDegreesAtIndex(i),poly[i].x+10,poly[i].y+10,0);
}
glPopMatrix();
}
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