float mglnrel::ptToBeeline2(
const Point2d& a, const Point2d& b, const Point2d& pt, Point2d& ptPerp)
{
// 两点重合
if (a == b)
{
ptPerp = a;
return a.distanceTo(pt);
}
// 竖直线
else if (mgEquals(a.x, b.x))
{
ptPerp.set(a.x, pt.y);
return fabsf(a.x - pt.x);
}
// 水平线
else if (mgEquals(a.y, b.y))
{
ptPerp.set(pt.x, a.y);
return fabsf(a.y - pt.y);
}
else
{
float t1 = ( b.y - a.y ) / ( b.x - a.x );
float t2 = -1.f / t1;
ptPerp.x = ( pt.y - a.y + a.x * t1 - pt.x * t2 ) / ( t1 - t2 );
ptPerp.y = a.y + (ptPerp.x - a.x) * t1;
return pt.distanceTo(ptPerp);
}
}
// http://blog.csdn.net/cyg0810/article/details/7765894
int mgcurv::crossTwoCircles(Point2d& pt1, Point2d& pt2,
const Point2d& c1, float r1, const Point2d& c2, float r2)
{
point_t p1, p2;
point_t ca(c1.x, c1.y);
point_t cb(c2.x, c2.y);
int n = _crossTwoCircles(p1, p2, ca, r1, cb, r2);
pt1.set((float)p1.x, (float)p1.y);
pt2.set((float)p2.x, (float)p2.y);
return n;
}
virtual bool load(MgStorage* s) {
pt.set(s->readFloat("x", pt.x), s->readFloat("y", pt.y));
vec.set(s->readFloat("w", vec.x), s->readFloat("h", vec.y));
stroke = s->readBool("stroke", stroke);
fill = s->readBool("fill", fill);
return true;
}
void Game::SpectatorsCheers(){
Point2d corner;
// The cheering will last for 2 seconds
if (clock() - cheer_start < 2000 && cheer_start != 0){
frames_to_cheer++;
if (frames_to_cheer == FRAMES_TO_CHEER_LIMIT){
// The changes of colors for the spectators will
// happen once on FRAMES_TO_CHEER_LIMIT frames,
// which in our case is 10
(m_last_scored == 0)?corner.set(-21.0f, 16.5f):corner.set(-21.0f, -1.0f);
RemoveSpectators(m_last_scored);
DrawSpectators(corner, m_last_scored);
frames_to_cheer = 0;
}
}
}
void Game::DrawSpectators(Point2d corner, int team){
const int columns = 5;
int rows = 14;
Circle spectator(10, SPECTATOR_CIRCLE_RAY);
float randr, randg;
for(int i=0; i < columns; ++i){
corner.set(corner.x + SPECTATOR_CIRCLE_RAY*2 + 0.1f,
corner.y - SPECTATOR_CIRCLE_RAY*2 + 0.43f);
for(int j=0; j < rows; ++j){
if (team == 0){
randr = (float)rand()/(3*RAND_MAX);
randg = (float)rand()/RAND_MAX;
spectator.SetColor(RGBcolor(randr, randg, 1.0f));
}
else if (team == 1){
randg = (float)rand()/RAND_MAX;
spectator.SetColor(RGBcolor(1.0f, randg, 0.09f));
}
spectator.DrawCircle(m_system, Point2d(corner.x,
corner.y - (SPECTATOR_CIRCLE_RAY*2 + 0.1f)*j));
if (team == 0){
spectators1.push_back(spectator.GetObject());
}
else {
spectators2.push_back(spectator.GetObject());
}
}
rows--;
}
}
int mgcurv::crossLineCircle(Point2d& pt1, Point2d& pt2, const Point2d& a,
const Point2d& b, const Point2d& c, float r)
{
if (a == b) {
return 0;
}
point_t p1, p2;
point_t a1(a.x - c.x, a.y - c.y);
point_t b1(b.x - c.x, b.y - c.y);
int n = _crossLineCircle(p1, p2, a1, b1, r);
pt1.set((float)p1.x + c.x, (float)p1.y + c.y);
pt2.set((float)p2.x + c.x, (float)p2.y + c.y);
return n;
}
/**
* calculate if this line intersects with the provided Line l
* Point2d * intersection output of the intersection point
*/
bool Line::intersect( const Line* l, Point2d & intersection ) {
const Line* p, *q;
/* compare length of lines and assign pointers */
if( this->length() < l->length() ) {
p = l;
q = this;
}
else {
p = this;
q = l;
} /* p is now the line longer or the same length then q */
float ccwpa = p->ccw( q->getA() );
float ccwpb = p->ccw( q->getB() );
float ccwqa = q->ccw( p->getA() );
float ccwqb = q->ccw( p->getB() );
/* check collinearity of the two lines */
if( fabs( ccwpa ) <= FLT_EPSILON && fabs( ccwpb ) <= FLT_EPSILON ) { /* lines are collinear */
return false; /* if they are collinear, just return false. */
}
/* lines are not collinear -> check for intersection or(!) contact */
if( ( ( ccwpa * ccwpb ) <= FLT_EPSILON )
&& ( ( ccwqa * ccwqb ) <= FLT_EPSILON ) ) {
//calculate the point
float den = ( p->getA().getX() - p->getB().getX() )
* ( q->getA().getY() - q->getB().getY() )
- ( p->getA().getY() - p->getB().getY() )
* ( q->getA().getX() - q->getB().getX() );
if( fabs( den ) <= FLT_EPSILON )
return false;
float x = ( ( p->getA().getX() * p->getB().getY()
- p->getA().getY() * p->getB().getX() )
* ( q->getA().getX() - q->getB().getX() )
- ( p->getA().getX() - p->getB().getX() )
* ( q->getA().getX() * q->getB().getY()
- q->getA().getY() * q->getB().getX() ) ) / den;
float y = ( ( p->getA().getX() * p->getB().getY()
- p->getA().getY() * p->getB().getX() )
* ( q->getA().getY() - q->getB().getY() )
- ( p->getA().getY() - p->getB().getY() )
* ( q->getA().getX() * q->getB().getY()
- q->getA().getY() * q->getB().getX() ) ) / den;
intersection.set( x, y );
return true;
}
return false;
}
bool GiTransform::zoomScale(float viewScale, const Point2d* pxAt, bool adjust)
{
// 检查显示比例
if (!adjust && ScaleOutRange(viewScale, m_impl))
return false;
viewScale = mgMax(viewScale, m_impl->minViewScale);
viewScale = mgMin(viewScale, m_impl->maxViewScale);
// 得到放缩中心点的客户区坐标
Point2d ptAt (m_impl->cxWnd * 0.5f, m_impl->cyWnd * 0.5f);
if (pxAt != NULL)
ptAt.set(pxAt->x, pxAt->y);
// 得到放缩中心点在放缩前的世界坐标
Point2d ptAtW (ptAt * m_impl->matD2W);
// 计算新显示比例下显示窗口中心的世界坐标
Point2d ptW;
float w2dx = m_impl->w2dx / m_impl->viewScale * viewScale;
float w2dy = m_impl->w2dy / m_impl->viewScale * viewScale;
ptW.x = ptAtW.x + (m_impl->cxWnd * 0.5f - ptAt.x) / w2dx;
ptW.y = ptAtW.y - (m_impl->cyWnd * 0.5f - ptAt.y) / w2dy;
// 检查新显示比例下显示窗口的世界坐标范围是否在极限范围内
float halfw = m_impl->cxWnd / w2dx * 0.5f;
float halfh = m_impl->cyWnd / w2dy * 0.5f;
Box2d box (ptW, 2 * halfw, 2 * halfh);
if (!AdjustCenterIn(adjust, box, m_impl->rectLimitsW, ptW, halfw, halfh)) {
return false;
}
if (halfw - 3 > m_impl->rectLimitsW.width() / 2
&& halfh - 3 > m_impl->rectLimitsW.height() / 2) // 显示比例太小
{
viewScale *= mgMin(2 * (halfw - 3) / m_impl->rectLimitsW.width(),
2 * (halfh - 3) / m_impl->rectLimitsW.height());
viewScale = mgMin(viewScale, m_impl->maxViewScale);
}
return m_impl->zoomNoAdjust(ptW, viewScale);
}
bool GiTransform::zoomScale(float viewScale, const Point2d* pxAt, bool adjust)
{
// 检查显示比例
if (!adjust && ScaleOutRange(viewScale, m_impl))
return false;
viewScale = mgMax(viewScale, m_impl->minViewScale);
viewScale = mgMin(viewScale, m_impl->maxViewScale);
// 得到放缩中心点的客户区坐标
Point2d ptAt (m_impl->cxWnd * 0.5f, m_impl->cyWnd * 0.5f);
if (pxAt != NULL)
ptAt.set(pxAt->x, pxAt->y);
// 得到放缩中心点在放缩前的世界坐标
Point2d ptAtW (ptAt * m_impl->matD2W);
// 计算新显示比例下显示窗口中心的世界坐标
Point2d ptW;
float w2dx = m_impl->w2dx / m_impl->viewScale * viewScale;
float w2dy = m_impl->w2dy / m_impl->viewScale * viewScale;
ptW.x = ptAtW.x + (m_impl->cxWnd * 0.5f - ptAt.x) / w2dx;
ptW.y = ptAtW.y - (m_impl->cyWnd * 0.5f - ptAt.y) / w2dy;
// 检查新显示比例下显示窗口的世界坐标范围是否在极限范围内
float halfw = m_impl->cxWnd / w2dx * 0.5f;
float halfh = m_impl->cyWnd / w2dy * 0.5f;
Box2d box (ptW, 2 * halfw, 2 * halfh);
if (!m_impl->rectLimitsW.isEmpty() && !m_impl->rectLimitsW.contains(box))
{
if (adjust)
AdjustCenterW(ptW, halfw, halfh, m_impl->rectLimitsW);
else
return false;
}
return m_impl->zoomNoAdjust(ptW, viewScale);
}
bool GiTransform::zoomTo(const Box2d& rectWorld, const RECT_2D* rcTo, bool adjust)
{
// 如果图形范围的宽或高接近于零，就返回
if (rectWorld.isEmpty())
return false;
// 计算像素到毫米的比例
const float d2mmX = m_impl->viewScale / m_impl->w2dx;
const float d2mmY = m_impl->viewScale / m_impl->w2dy;
// 计算目标窗口区域(毫米)
float w = 0, h = 0;
Point2d ptCen;
if (rcTo != NULL) {
w = fabsf(static_cast<float>(rcTo->right - rcTo->left));
h = fabsf(static_cast<float>(rcTo->bottom - rcTo->top));
ptCen.x = (rcTo->left + rcTo->right) * 0.5f;
ptCen.y = (rcTo->top + rcTo->bottom) * 0.5f;
}
if (w < 4 || h < 4) {
w = (float)m_impl->cxWnd;
h = (float)m_impl->cyWnd;
ptCen.set(w * 0.5f, h * 0.5f);
w -= 8;
h -= 8;
}
if (w < 4 || h < 4)
return false;
w *= d2mmX;
h *= d2mmY;
ptCen.scaleBy(d2mmX, d2mmY);
// 计算新显示比例 (中心不变，缩小窗口区域使得宽高比例和图形范围相同)
float scale;
if (h * rectWorld.width() > w * rectWorld.height()) {
//h = w * rectWorld.height() / rectWorld.width();
scale = w / rectWorld.width();
}
else {
//w = h * rectWorld.width() / rectWorld.height();
scale = h / rectWorld.height();
}
// 检查显示比例
if (!adjust && ScaleOutRange(scale, m_impl))
return false;
scale = mgMax(scale, m_impl->minViewScale);
scale = mgMin(scale, m_impl->maxViewScale);
// 计算在新显示比例下显示窗口中心的世界坐标
Point2d ptW;
ptW.x = rectWorld.center().x + (m_impl->cxWnd * d2mmX * 0.5f - ptCen.x) / scale;
ptW.y = rectWorld.center().y - (m_impl->cyWnd * d2mmY * 0.5f - ptCen.y) / scale;
// 检查新显示比例下显示窗口的世界坐标范围是否在极限范围内
float halfw = m_impl->cxWnd * d2mmX / scale * 0.5f;
float halfh = m_impl->cyWnd * d2mmY / scale * 0.5f;
Box2d box (ptW, 2 * halfw, 2 * halfh);
if (!AdjustCenterIn(adjust, box, m_impl->rectLimitsW, ptW, halfw, halfh)) {
return false;
}
return m_impl->zoomNoAdjust(ptW, scale);
}
void Matrix2d::getCoordSystem(Vector2d& e0, Vector2d& e1, Point2d& origin) const
{
e0.set(m11, m12);
e1.set(m21, m22);
origin.set(dx, dy);
}
virtual bool load(MgStorage* s) {
pt.set(s->readFloat("x", pt.x), s->readFloat("y", pt.y));
vec.set(s->readFloat("w", vec.x), s->readFloat("h", vec.y));
return true;
}
virtual bool load(MgStorage* s) {
pt1.set(s->readFloat("x1", pt1.x), s->readFloat("y1", pt1.y));
pt2.set(s->readFloat("x2", pt2.x), s->readFloat("y2", pt2.y));
return true;
}