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::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::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::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::drawArc(const GiContext* ctx,
const Point2d& center, float rx, float ry,
float startAngle, float sweepAngle,
bool modelUnit)
{
if (rx < _MGZERO || fabsf(sweepAngle) < 1e-5f || isStopping())
return false;
if (ry < _MGZERO)
ry = rx;
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(Box2d(center, 2 * rx, 2 * ry)))
return false;
Point2d points[16];
int count = mgcurv::arcToBezier(points, center,
rx, ry, startAngle, sweepAngle);
S2D(xf(), modelUnit).transformPoints(count, points);
return count > 3 && rawBeziers(ctx, points, count);
}
bool GiGraphics::drawArc(const GiContext* ctx,
const Point2d& center, float rx, float ry,
float startAngle, float sweepAngle,
bool modelUnit)
{
if (m_impl->drawRefcnt == 0 || rx < _MGZERO || fabs(sweepAngle) < 1e-5f)
return false;
GiLock lock (&m_impl->drawRefcnt);
if (ry < _MGZERO)
ry = rx;
if (!DRAW_RECT(m_impl, modelUnit).isIntersect(Box2d(center, 2 * rx, 2 * ry)))
return false;
Point2d points[16];
int count = mgAngleArcToBezier(points, center,
rx, ry, startAngle, sweepAngle);
S2D(xf(), modelUnit).TransformPoints(count, points);
return count > 3 && rawBeziers(ctx, points, count);
}
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;
}
