void Triangle::changePoints(const TexturedPoint& a, const TexturedPoint& b, const TexturedPoint& c){
points.clear();
points.push_back(a);
points.push_back(b);
points.push_back(c);
currAngle = 0;
currScaleX = DEFAULT_SCALE_X;
currScaleY = DEFAULT_SCALE_Y;
rotCenterX = (a.x() + b.x() + c.x())/3.;
rotCenterY = (a.y() + b.y() + c.y())/3.;
}
void Triangle::changePoints(const TexturedPoint& a, const TexturedPoint& b, const TexturedPoint& c){
// заполняем вектор вершин
points.clear();
points.push_back(a);
points.push_back(b);
points.push_back(c);
// установка параметоров начальных
currAngle = 0;
currScaleX = DEFAULT_SCALE_X;
currScaleY = DEFAULT_SCALE_Y;
//?
// вычисление центра вращения
rotCenterX = (a.x() + b.x() + c.x())/3.;
rotCenterY = (a.y() + b.y() + c.y())/3.;
}
// отрисовка из прошлой лабы, только берём цвета из текстуры
void Triangle::draw(Canvas& canvas, Texture* texture = 0) {
std::vector<TexturedPoint> points;
// преобразование и упорядочивание по x
transform(points);
std::sort(points.begin(), points.end());
std::vector<Edge> edges;
// установка границ
int minY = (points.front().y() < 0) ? 0: points.front().y();
int maxY = (points.back().y() < this->maxY) ? points.back().y() : this->maxY - 1;
int curY = minY;
int i = 0;
while (curY < maxY) {
int nextY = maxY;
while ( i != (int)points.size() && trunc( points[i].y()) <= curY ){
TexturedPoint a = points[i];
TexturedPoint b = points[(points.size() - i - 1 ) % points.size()];
TexturedPoint c = points[(i + 1) % points.size()];
if (b.y() > curY ) {
edges.push_back(Edge(a,b));
if ( b.y() < nextY ) {
nextY = b.y() ;
}
}
if (c.y() > curY) {
edges.push_back(Edge(a,c));
if ( c.y() < nextY) {
nextY = c.y();
}
}
++i;
}
while(curY <= nextY && curY <= maxY) {
std::vector<TexturedPoint> borderX;
for (int i = 0; i < (int)edges.size(); ++i) {
int n = curY - edges[i].getA().y();
double curX = (edges[i].getA().x()) + n * edges[i].getK();
TexturedPoint texCoord(curX, curY);
texCoord.calcTextureCoordinates(edges[i].getA(), edges[i].getB());
borderX.push_back(texCoord);
}
std::sort(borderX.begin(), borderX.end(), TexturedPoint::compX);
int begin = borderX.front().x() > 0 ? borderX.front().x() : 0;
for (int x = begin; x < borderX.back().x() && x < maxX; ++x) {
TexturedPoint curPoint(x, curY);
curPoint.calcTextureCoordinates(borderX.front(),borderX.back());
if (0 == texture) {
// если текстуры нет( то как градиент )
canvas.drawPixel(x, curY, TexturedPoint::transformToColor(curPoint.getTexX(), curPoint.getTexY()));
} else {
canvas.drawPixel(x, curY, texture->get_color(curPoint));
}
}
++curY;
}
std::vector<Edge>::iterator iter = edges.begin();
while (iter != edges.end()) {
if ( (*iter).getB().y() < curY) {
edges.erase(iter);
}
else {
++iter;
}
}
}
}
