bool GiGraphics::drawPath(const GiContext* ctx, int count,
const Point2d* points, const UInt8* types,
bool modelUnit)
{
if (m_impl->drawRefcnt == 0 || count < 2
|| points == NULL || types == NULL)
return false;
GiLock lock (&m_impl->drawRefcnt);
if (count > 0x2000)
count = 0x2000;
Matrix2d matD(S2D(xf(), modelUnit));
const Box2d extent (count, points); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
vector<Point2d> pxpoints;
pxpoints.resize(count);
Point2d *pxs = &pxpoints.front();
for (int i = 0; i < count; i++)
pxs[i] = points[i] * matD;
return rawPath(ctx, count, pxs, types);
}
bool GiGraphics::drawSplines(const GiContext* ctx, int count,
const Point2d* knots,
const Vector2d* knotvs, bool modelUnit)
{
if (m_impl->drawRefcnt == 0 || count < 2
|| knots == NULL || knotvs == NULL)
return false;
GiLock lock (&m_impl->drawRefcnt);
count = mgMin(count, static_cast<int>(1 + (0x2000 - 1) / 3));
int i;
Point2d pt;
Vector2d vec;
vector<Point2d> pxpoints;
Matrix2d matD(S2D(xf(), modelUnit));
// 开辟整形像素坐标数组
pxpoints.resize(1 + (count - 1) * 3);
Point2d *pxs = &pxpoints.front();
pt = knots[0] * matD; // 第一个Bezier段的起点
vec = knotvs[0] * matD / 3.f; // 第一个Bezier段的起始矢量
*pxs++ = pt; // 产生Bezier段的起点
for (i = 1; i < count; i++) // 计算每一个Bezier段
{
*pxs++ = (pt += vec); // 产生Bezier段的第二点
pt = knots[i] * matD; // Bezier段的终点
vec = knotvs[i] * matD / 3.f; // Bezier段的终止矢量
*pxs++ = pt - vec; // 产生Bezier段的第三点
*pxs++ = pt; // 产生Bezier段的终点
}
// 绘图
return rawBeziers(ctx, &pxpoints.front(), getSize(pxpoints));
}
bool GiGraphics::drawHermiteSplines(const GiContext* ctx, int count, const Point2d* knots,
const Vector2d* knotvs, bool closed, bool modelUnit)
{
if (count < 2 || !knots || !knotvs || isStopping())
return false;
count = mgMin(count, 0x1000);
int i;
Point2d pt;
Vector2d vec;
vector<Point2d> pxpoints;
Matrix2d matD(S2D(xf(), modelUnit));
Matrix2d mat2(matD / 3.f);
pxpoints.resize(1 + (closed ? count : count - 1) * 3);
Point2d *pxs = &pxpoints.front();
pt = knots[0] * matD; // 第一个Bezier段的起点
vec = knotvs[0] * mat2; // 第一个Bezier段的起始矢量
*pxs++ = pt; // 产生Bezier段的起点
for (i = 1; i < count; i++) { // 计算每一个Bezier段
*pxs++ = (pt += vec); // 产生Bezier段的第二点
pt = knots[i] * matD; // Bezier段的终点
vec = knotvs[i] * mat2; // Bezier段的终止矢量
*pxs++ = pt - vec; // 产生Bezier段的第三点
*pxs++ = pt; // 产生Bezier段的终点
}
if (closed) {
*pxs++ = (pt += vec); // 产生Bezier段的第二点
*pxs++ = 2 * pxpoints[0] - pxpoints[1].asVector(); // 产生Bezier段的第三点
*pxs++ = pxpoints[0]; // 产生Bezier段的终点
}
return rawBeziers(ctx, &pxpoints.front(), getSize(pxpoints), closed);
}
bool GiGraphics::drawEllipse(const GiContext* ctx, const Point2d& center,
float rx, float ry, bool modelUnit)
{
if (rx < _MGZERO || isStopping())
return false;
bool ret = false;
Matrix2d matD(S2D(xf(), modelUnit));
if (ry < _MGZERO) {
ry = (Vector2d(rx, rx) * matD).x;
ry = fabsf((Vector2d(ry, ry) * matD.inverse()).y);
}
const Box2d extent (center, rx*2.f, ry*2.f); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
if (mgIsZero(matD.m12) && mgIsZero(matD.m21)) {
Point2d cen (center * matD);
rx *= fabsf(matD.m11);
ry *= fabsf(matD.m22);
ret = rawEllipse(ctx, cen.x - rx, cen.y - ry, 2 * rx, 2 * ry);
} else {
Point2d pxs[13];
mgcurv::ellipseToBezier(pxs, center, rx, ry);
matD.transformPoints(13, pxs);
ret = rawBeziers(ctx, pxs, 13, true);
}
return ret;
}
bool GiGraphics::drawClosedBSplines(const GiContext* ctx,
int count,
const Point2d* ctlpts,
bool modelUnit)
{
if (m_impl->drawRefcnt == 0 || count < 3 || ctlpts == NULL)
return false;
GiLock lock (&m_impl->drawRefcnt);
count = mgMin(count, static_cast<int>((0x2000 - 1) / 3));
const Box2d extent (count, ctlpts); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
int i;
Point2d pt1, pt2, pt3, pt4;
float d6 = 1.f / 6.f;
vector<Point2d> pxpoints;
Matrix2d matD(S2D(xf(), modelUnit));
// 开辟整形像素坐标数组
pxpoints.resize(1 + count * 3);
Point2d *pxs = &pxpoints.front();
// 计算第一个曲线段
pt1 = ctlpts[0] * matD;
pt2 = ctlpts[1] * matD;
pt3 = ctlpts[2] * matD;
pt4 = ctlpts[3 % count] * matD;
(*pxs++).set((pt1.x + 4 * pt2.x + pt3.x)*d6, (pt1.y + 4 * pt2.y + pt3.y)*d6);
(*pxs++).set((4 * pt2.x + 2 * pt3.x) *d6, (4 * pt2.y + 2 * pt3.y) *d6);
(*pxs++).set((2 * pt2.x + 4 * pt3.x) *d6, (2 * pt2.y + 4 * pt3.y) *d6);
(*pxs++).set((pt2.x + 4 * pt3.x + pt4.x)*d6, (pt2.y + 4 * pt3.y + pt4.y)*d6);
// 计算其余曲线段
for (i = 4; i < count + 3; i++)
{
pt1 = pt2;
pt2 = pt3;
pt3 = pt4;
pt4 = ctlpts[i % count] * matD;
(*pxs++).set((4 * pt2.x + 2 * pt3.x) *d6, (4 * pt2.y + 2 * pt3.y) *d6);
(*pxs++).set((2 * pt2.x + 4 * pt3.x) *d6, (2 * pt2.y + 4 * pt3.y) *d6);
(*pxs++).set((pt2.x + 4 * pt3.x + pt4.x)*d6, (pt2.y + 4 * pt3.y + pt4.y)*d6);
}
// 绘图
bool ret = rawBeginPath();
if (ret)
{
ret = rawMoveTo(pxs[0].x, pxs[0].y);
ret = rawBezierTo(pxs + 1, getSize(pxpoints) - 1);
ret = rawClosePath();
ret = rawEndPath(ctx, true);
}
return ret;
}
bool GiGraphics::drawBeziers(const GiContext* ctx, int count,
const Point2d* points, bool modelUnit)
{
if (m_impl->drawRefcnt == 0 || count < 4 || points == NULL)
return false;
GiLock lock (&m_impl->drawRefcnt);
if (count > 0x2000)
count = 0x2000;
count = 1 + (count - 1) / 3 * 3;
bool ret = false;
vector<Point2d> pxpoints;
vector<Point2d> pointBuf;
int i, j, n, si, ei;
Point2d * pxs;
Matrix2d matD(S2D(xf(), modelUnit));
const Box2d extent (count, points); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
if (DRAW_MAXR(m_impl, modelUnit).contains(extent)) // 全部在显示区域内
{
pxpoints.resize(count);
pxs = &pxpoints.front();
for (i = 0; i < count; i++)
pxs[i] = points[i] * matD;
ret = rawBeziers(ctx, pxs, count);
}
else
{
pointBuf.resize(count);
for (i = 0; i < count; i++) // 转换到像素坐标
pointBuf[i] = points[i] * matD;
Point2d* pts = &pointBuf.front();
si = ei = 0;
for (i = 3; i < count; i += 3)
{
for ( ; i < count
&& m_impl->rectDraw.isIntersect(Box2d(4, &pts[ei])); i += 3)
ei = i;
n = ei - si + 1;
if (n > 1)
{
pxpoints.resize(n);
pxs = &pxpoints.front();
for (j=0; j<n; j++)
pxs[j] = pts[si + j];
ret = rawBeziers(ctx, pxs, n);
}
si = ei = i;
}
}
return ret;
}
bool GiGraphics::drawBeziers(const GiContext* ctx, int count,
const Point2d* points, bool closed, bool modelUnit)
{
if (count < 4 || !points || isStopping())
return false;
if (count > 0x2000)
count = 0x2000;
count = 1 + (count - 1) / 3 * 3;
bool ret = false;
vector<Point2d> pxpoints;
vector<Point2d> pointBuf;
int i, j, n, si, ei;
Point2d * pxs;
Matrix2d matD(S2D(xf(), modelUnit));
const Box2d extent (count, points); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
if (closed) {
pxpoints.resize(count);
pxs = &pxpoints.front();
for (i = 0; i < count; i++)
pxs[i] = points[i] * matD;
ret = rawBeziers(ctx, pxs, count, closed);
}
else if (DRAW_MAXR(m_impl, modelUnit).contains(extent)) { // 全部在显示区域内
pxpoints.resize(count);
pxs = &pxpoints.front();
for (i = 0; i < count; i++)
pxs[i] = points[i] * matD;
ret = rawBeziers(ctx, pxs, count);
} else {
pointBuf.resize(count);
for (i = 0; i < count; i++) // 转换到像素坐标
pointBuf[i] = points[i] * matD;
Point2d* pts = &pointBuf.front();
for (i = 0; i + 3 < count;) {
for (; i + 3 < count && !m_impl->rectDraw.isIntersect(Box2d(4, &pts[i])); i += 3) ;
si = ei = i;
for (; i + 3 < count && m_impl->rectDraw.isIntersect(Box2d(4, &pts[i])); i += 3)
ei = i + 3;
if (ei > si) {
n = ei - si + 1;
pxpoints.resize(n);
pxs = &pxpoints.front();
for (j=0; j<n; j++)
pxs[j] = pts[si + j];
ret = rawBeziers(ctx, pxs, n);
}
}
}
return ret;
}
bool GiGraphics::drawLines(const GiContext* ctx, int count,
const Point2d* points, bool modelUnit)
{
if (m_impl->drawRefcnt == 0 || count < 2 || points == NULL)
return false;
if (count > 0x2000)
count = 0x2000;
GiLock lock (&m_impl->drawRefcnt);
int i;
Point2d pt1, pt2, ptLast;
vector<Point2d> pxpoints;
vector<Point2d> pointBuf;
bool ret = false;
Matrix2d matD(S2D(xf(), modelUnit));
const Box2d extent (count, points); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
if (DRAW_MAXR(m_impl, modelUnit).contains(extent)) // 全部在显示区域内
{
pxpoints.resize(count);
Point2d* pxs = &pxpoints.front();
int n = 0;
for (i = 0; i < count; i++)
{
pt2 = points[i] * matD;
if (i == 0 || fabs(pt1.x - pt2.x) > 2 || fabs(pt1.y - pt2.y) > 2)
{
pt1 = pt2;
pxs[n++] = pt2;
}
}
ret = rawLines(ctx, pxs, n);
}
else // 部分在显示区域内
{
pointBuf.resize(count);
for (i = 0; i < count; i++) // 转换到像素坐标
pointBuf[i] = points[i] * matD;
Point2d* pts = &pointBuf.front();
ptLast = pts[0];
PolylineAux aux(this, ctx);
for (i = 0; i < count - 1; i++)
{
ret = DrawEdge(count, i, pts, ptLast, aux, m_impl->rectDraw) || ret;
}
}
return ret;
}
bool GiGraphics::drawClosedSplines(const GiContext* ctx, int count,
const Point2d* knots,
const Vector2d* knotvs,
bool modelUnit)
{
if (m_impl->drawRefcnt == 0 || count < 2 ||
knots == NULL || knotvs == NULL)
return false;
GiLock lock (&m_impl->drawRefcnt);
count = mgMin(count, static_cast<int>((0x2000 - 1) / 3));
int i, j = 0;
Point2d pt;
Vector2d vec;
vector<Point2d> pxpoints;
Matrix2d matD(S2D(xf(), modelUnit));
// 开辟像素坐标数组
pxpoints.resize(1 + count * 3);
Point2d *pxs = &pxpoints.front();
pt = knots[0] * matD; // 第一个Bezier段的起点
vec = knotvs[0] * matD / 3.f; // 第一个Bezier段的起始矢量
pxs[j++] = pt; // 产生Bezier段的起点
for (i = 1; i < count; i++) // 计算每一个Bezier段
{
pxs[j++] = (pt += vec); // 产生Bezier段的第二点
pt = knots[i] * matD; // Bezier段的终点
vec = knotvs[i] * matD / 3.f; // Bezier段的终止矢量
pxs[j++] = pt - vec; // 产生Bezier段的第三点
pxs[j++] = pt; // 产生Bezier段的终点
}
pxs[j++] = (pt += vec); // 产生Bezier段的第二点
pxs[j] = 2 * pxs[0] - pxs[1].asVector(); // 产生Bezier段的第三点
pxs[j+1] = pxs[0]; // 产生Bezier段的终点
// 绘图
bool ret = rawBeginPath();
if (ret)
{
rawMoveTo(pxs[0].x, pxs[0].y);
for (i = 1; i + 2 < getSize(pxpoints); i += 3) {
rawBezierTo(pxs[i].x, pxs[i].y,
pxs[i+1].x, pxs[i+1].y, pxs[i+2].x, pxs[i+2].y);
}
rawClosePath();
ret = rawEndPath(ctx, true);
}
return ret;
}
bool GiGraphics::drawBSplines(const GiContext* ctx, int count, const Point2d* ctlpts,
bool closed, bool modelUnit)
{
if (closed) {
if (count < 3 || !ctlpts || isStopping())
return false;
count = mgMin(count, static_cast<int>((0x2000 - 1) / 3));
} else {
if (count < 4 || !ctlpts || isStopping())
return false;
count = mgMin(count, static_cast<int>(3 + (0x2000 - 1) / 3));
}
const Box2d extent (count, ctlpts); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
int i;
Point2d pt1, pt2, pt3, pt4;
float d6 = 1.f / 6.f;
vector<Point2d> pxpoints;
Matrix2d matD(S2D(xf(), modelUnit));
// 开辟像素坐标数组
pxpoints.resize(1 + (closed ? count : (count - 3)) * 3);
Point2d *pxs = &pxpoints.front();
// 计算第一个曲线段
pt1 = ctlpts[0] * matD;
pt2 = ctlpts[1] * matD;
pt3 = ctlpts[2] * matD;
pt4 = ctlpts[3 % count] * matD;
(*pxs++).set((pt1.x + 4 * pt2.x + pt3.x)*d6, (pt1.y + 4 * pt2.y + pt3.y)*d6);
(*pxs++).set((4 * pt2.x + 2 * pt3.x) *d6, (4 * pt2.y + 2 * pt3.y) *d6);
(*pxs++).set((2 * pt2.x + 4 * pt3.x) *d6, (2 * pt2.y + 4 * pt3.y) *d6);
(*pxs++).set((pt2.x + 4 * pt3.x + pt4.x)*d6, (pt2.y + 4 * pt3.y + pt4.y)*d6);
// 计算其余曲线段
for (i = 4; i < (closed ? (count + 3) : count); i++) {
pt1 = pt2;
pt2 = pt3;
pt3 = pt4;
pt4 = ctlpts[i % count] * matD;
(*pxs++).set((4 * pt2.x + 2 * pt3.x) *d6, (4 * pt2.y + 2 * pt3.y) *d6);
(*pxs++).set((2 * pt2.x + 4 * pt3.x) *d6, (2 * pt2.y + 4 * pt3.y) *d6);
(*pxs++).set((pt2.x + 4 * pt3.x + pt4.x)*d6,(pt2.y + 4 * pt3.y + pt4.y)*d6);
}
// 绘图
return rawBeziers(ctx, &pxpoints.front(), getSize(pxpoints), closed);
}
bool GiGraphics::drawEllipse(const GiContext* ctx, const Point2d& center,
float rx, float ry, bool modelUnit)
{
if (m_impl->drawRefcnt == 0 || rx < _MGZERO)
return false;
GiLock lock (&m_impl->drawRefcnt);
bool ret = false;
Matrix2d matD(S2D(xf(), modelUnit));
if (ry < _MGZERO) {
ry = (Vector2d(rx, rx) * matD).x;
ry = fabsf((Vector2d(ry, ry) * matD.inverse()).y);
}
const Box2d extent (center, rx*2.f, ry*2.f); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
if (mgIsZero(matD.m12) && mgIsZero(matD.m21))
{
Point2d cen (center * matD);
rx *= fabsf(matD.m11);
ry *= fabsf(matD.m22);
ret = rawEllipse(ctx, cen.x - rx, cen.y - ry, 2 * rx, 2 * ry);
}
else
{
Point2d pxs[13];
mgcurv::ellipseToBezier(pxs, center, rx, ry);
matD.TransformPoints(13, pxs);
ret = rawBeginPath();
if (ret)
{
rawMoveTo(pxs[0].x, pxs[0].y);
for (int i = 1; i + 2 < 13; i += 3) {
rawBezierTo(pxs[i].x, pxs[i].y,
pxs[i+1].x, pxs[i+1].y, pxs[i+2].x, pxs[i+2].y);
}
rawClosePath();
ret = rawEndPath(ctx, true);
}
}
return ret;
}
bool GiGraphics::drawPath(const GiContext* ctx, const GiPath& path,
bool fill, bool modelUnit)
{
int n = path.getCount();
if (n == 0)
return false;
Matrix2d matD(S2D(xf(), modelUnit));
const Point2d* pts = path.getPoints();
const char* types = path.getTypes();
Point2d a, b, c;
rawBeginPath();
for (int i = 0; i < n; i++) {
switch (types[i] & ~kGiCloseFigure) {
case kGiMoveTo:
a = pts[i] * matD;
rawMoveTo(a.x, a.y);
break;
case kGiLineTo:
a = pts[i] * matD;
rawLineTo(a.x, a.y);
break;
case kGiBeziersTo:
if (i + 2 >= n)
return false;
a = pts[i] * matD;
b = pts[i+1] * matD;
c = pts[i+2] * matD;
rawBezierTo(a.x, a.y, b.x, b.y, c.x, c.y);
i += 2;
break;
default:
return false;
}
if (types[i] & kGiCloseFigure)
rawClosePath();
}
return rawEndPath(ctx, fill);
}
bool GiGraphics::drawEllipse(const GiContext* ctx, const Point2d& center,
float rx, float ry, bool modelUnit)
{
if (m_impl->drawRefcnt == 0 || rx < _MGZERO)
return false;
GiLock lock (&m_impl->drawRefcnt);
bool ret = false;
Matrix2d matD(S2D(xf(), modelUnit));
if (ry < _MGZERO)
ry = rx;
const Box2d extent (center, rx*2.f, ry*2.f); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
if (mgIsZero(matD.m12) && mgIsZero(matD.m21))
{
Point2d cen (center * matD);
rx *= matD.m11;
ry *= matD.m22;
ret = rawEllipse(ctx, cen.x - rx, cen.y - ry, 2 * rx, 2 * ry);
}
else
{
Point2d points[13];
mgEllipseToBezier(points, center, rx, ry);
matD.TransformPoints(13, points);
ret = rawBeginPath();
if (ret)
{
ret = rawMoveTo(points[0].x, points[0].y);
ret = rawBezierTo(points + 1, 12);
ret = rawClosePath();
ret = rawEndPath(ctx, true);
}
}
return ret;
}
bool GiGraphics::_drawPolygon(const GiContext* ctx, int count, const Point2d* points,
bool m2d, bool fill, bool edge, bool modelUnit)
{
GiContext context (ctx ? *ctx : m_impl->ctx);
if (!edge)
context.setNullLine();
if (!fill)
context.setNoFillColor();
if (context.isNullLine() && !context.hasFillColor())
return false;
vector<Point2d> pxpoints;
Point2d pt1, pt2;
Matrix2d matD(S2D(xf(), modelUnit));
pxpoints.resize(count);
Point2d *pxs = &pxpoints.front();
int n = 0;
for (int i = 0; i < count; i++) {
pt2 = points[i];
if (m2d)
pt2 *= matD;
if (i == 0 || count <= 4
|| fabsf(pt1.x - pt2.x) > 2
|| fabsf(pt1.y - pt2.y) > 2) {
pt1 = pt2;
pxs[n++] = pt1;
}
}
if (n == 4 && m2d
&& mgEquals(pxs[0].x, pxs[3].x) && mgEquals(pxs[1].x, pxs[2].x)
&& mgEquals(pxs[0].y, pxs[1].y) && mgEquals(pxs[2].y, pxs[3].y))
{
Box2d rc(pxs[0].x, pxs[0].y, pxs[2].x, pxs[2].y, true);
return rawRect(&context, rc.xmin, rc.ymin, rc.width(), rc.height());
}
return rawPolygon(&context, pxs, n);
}
static bool _DrawPolygon(GiCanvas* cv, const GiContext* ctx,
int count, const Point2d* points,
bool bM2D, bool bFill, bool bEdge, bool modelUnit)
{
if (!ctx && cv)
ctx = cv->getCurrentContext();
if (!ctx || !cv)
return false;
GiContext context (*ctx);
if (!bEdge)
context.setNullLine();
if (!bFill)
context.setNoFillColor();
if (context.isNullLine() && !context.hasFillColor())
return false;
vector<Point2d> pxpoints;
Point2d pt1, pt2;
Matrix2d matD(S2D(cv->owner()->xf(), modelUnit));
pxpoints.resize(count);
Point2d *pxs = &pxpoints.front();
int n = 0;
for (int i = 0; i < count; i++)
{
pt2 = points[i];
if (bM2D)
pt2 *= matD;
if (i == 0 || fabs(pt1.x - pt2.x) > 2
|| fabs(pt1.y - pt2.y) > 2)
{
pt1 = pt2;
pxs[n++] = pt1;
}
}
return cv->rawPolygon(&context, pxs, n);
}
bool GiGraphics::drawBeziers(const GiContext* ctx, int count,
const Point2d* knot, const Vector2d* knotvs,
bool closed, bool modelUnit)
{
if (count < 2 || !knot || !knotvs || isStopping())
return false;
if (count > 0x1000)
count = 0x1000;
bool ret = false;
vector<Point2d> pxpoints;
vector<Point2d> pointBuf;
int i, j, n, si, ei;
Point2d * pxs;
Matrix2d matD(S2D(xf(), modelUnit));
const Box2d extent (count, knot); // 模型坐标范围
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent)) // 全部在显示区域外
return false;
pointBuf.resize(1 + (count - 1) * 3);
pxs = &pointBuf.front();
if (closed) {
pxs[0] = knot[0] * matD;
for (i = 0, j = 1; i + 1 < count; i++) {
pxs[j++] = (knot[i] + knotvs[i]) * matD;
pxs[j++] = (knot[i+1] - knotvs[i+1]) * matD;
pxs[j++] = knot[i+1] * matD;
}
ret = rawBeziers(ctx, pxs, j, closed);
}
else if (DRAW_MAXR(m_impl, modelUnit).contains(extent)) { // 全部在显示区域内
pxs[0] = knot[0] * matD;
for (i = 0, j = 1; i + 1 < count; i++) {
pxs[j++] = (knot[i] + knotvs[i]) * matD;
pxs[j++] = (knot[i+1] - knotvs[i+1]) * matD;
pxs[j++] = knot[i+1] * matD;
}
ret = rawBeziers(ctx, pxs, j);
} else {
pxs[0] = knot[0] * matD;
for (i = 0, j = 1; i + 1 < count; i++) {
pxs[j++] = (knot[i] + knotvs[i]) * matD;
pxs[j++] = (knot[i+1] - knotvs[i+1]) * matD;
pxs[j++] = knot[i+1] * matD;
}
Point2d* pts = pxs;
count = 1 + (count - 1) * 3;
for (i = 0; i + 3 < count;) {
for (; i + 3 < count && !m_impl->rectDraw.isIntersect(Box2d(4, &pts[i])); i += 3) ;
si = ei = i;
for (; i + 3 < count && m_impl->rectDraw.isIntersect(Box2d(4, &pts[i])); i += 3)
ei = i + 3;
if (ei > si) {
n = ei - si + 1;
pxpoints.resize(n);
pxs = &pxpoints.front();
for (j=0; j<n; j++)
pxs[j] = pts[si + j];
ret = rawBeziers(ctx, pxs, n);
}
}
}
return ret;
}
