// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "xfa/fxgraphics/cfx_path_generator.h"
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CFX_PathGenerator::CFX_PathGenerator() : m_pPathData(nullptr) {}
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void CFX_PathGenerator::Create() {
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m_pPathData = new CFX_PathData;
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}
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CFX_PathGenerator::~CFX_PathGenerator() {
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delete m_pPathData;
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}
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void CFX_PathGenerator::AddPathData(CFX_PathData* pPathData) {
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if (pPathData && pPathData->GetPointCount() > 0) {
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int nCount = pPathData->GetPointCount();
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FX_PATHPOINT* pPoints = pPathData->GetPoints();
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AddPathData(pPoints, nCount);
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}
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}
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void CFX_PathGenerator::AddPathData(FX_PATHPOINT* pPoints, int nCount) {
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if (pPoints && nCount > 0) {
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int nOldCount = m_pPathData->GetPointCount();
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m_pPathData->AddPointCount(nCount);
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FX_PATHPOINT* pDstPoints = m_pPathData->GetPoints();
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FXSYS_memcpy(pDstPoints + nOldCount, pPoints,
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sizeof(FX_PATHPOINT) * nCount);
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}
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}
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void CFX_PathGenerator::MoveTo(FX_FLOAT x, FX_FLOAT y) {
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m_pPathData->AddPointCount(1);
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m_pPathData->SetPoint(m_pPathData->GetPointCount() - 1, x, y, FXPT_MOVETO);
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}
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void CFX_PathGenerator::LineTo(FX_FLOAT x, FX_FLOAT y) {
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m_pPathData->AddPointCount(1);
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m_pPathData->SetPoint(m_pPathData->GetPointCount() - 1, x, y, FXPT_LINETO);
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}
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void CFX_PathGenerator::BezierTo(FX_FLOAT ctrl_x1,
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FX_FLOAT ctrl_y1,
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FX_FLOAT ctrl_x2,
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FX_FLOAT ctrl_y2,
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FX_FLOAT to_x,
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FX_FLOAT to_y) {
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int old_count = m_pPathData->GetPointCount();
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m_pPathData->AddPointCount(3);
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m_pPathData->SetPoint(old_count, ctrl_x1, ctrl_y1, FXPT_BEZIERTO);
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m_pPathData->SetPoint(old_count + 1, ctrl_x2, ctrl_y2, FXPT_BEZIERTO);
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m_pPathData->SetPoint(old_count + 2, to_x, to_y, FXPT_BEZIERTO);
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}
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void CFX_PathGenerator::Close() {
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if (m_pPathData->GetPointCount() > 0) {
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int index = m_pPathData->GetPointCount() - 1;
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FX_PATHPOINT* pPoints = m_pPathData->GetPoints();
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pPoints[index].m_Flag |= FXPT_CLOSEFIGURE;
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}
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}
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void CFX_PathGenerator::AddLine(FX_FLOAT x1,
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FX_FLOAT y1,
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FX_FLOAT x2,
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FX_FLOAT y2) {
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int old_count = m_pPathData->GetPointCount();
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m_pPathData->AddPointCount(2);
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m_pPathData->SetPoint(old_count, x1, y1, FXPT_MOVETO);
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m_pPathData->SetPoint(old_count + 1, x2, y2, FXPT_LINETO);
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}
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void CFX_PathGenerator::AddBezier(FX_FLOAT start_x,
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FX_FLOAT start_y,
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FX_FLOAT ctrl_x1,
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FX_FLOAT ctrl_y1,
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FX_FLOAT ctrl_x2,
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FX_FLOAT ctrl_y2,
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FX_FLOAT end_x,
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FX_FLOAT end_y) {
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int old_count = m_pPathData->GetPointCount();
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m_pPathData->AddPointCount(4);
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m_pPathData->SetPoint(old_count, start_x, start_y, FXPT_MOVETO);
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m_pPathData->SetPoint(old_count + 1, ctrl_x1, ctrl_y1, FXPT_BEZIERTO);
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m_pPathData->SetPoint(old_count + 2, ctrl_x2, ctrl_y2, FXPT_BEZIERTO);
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m_pPathData->SetPoint(old_count + 3, end_x, end_y, FXPT_BEZIERTO);
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}
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void CFX_PathGenerator::AddRectangle(FX_FLOAT x1,
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FX_FLOAT y1,
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FX_FLOAT x2,
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FX_FLOAT y2) {
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m_pPathData->AppendRect(x1, y1, x2, y2);
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}
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void CFX_PathGenerator::AddEllipse(FX_FLOAT x,
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FX_FLOAT y,
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FX_FLOAT width,
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FX_FLOAT height) {
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AddArc(x, y, width, height, 0, FX_PI * 2);
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}
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void CFX_PathGenerator::ArcTo(FX_FLOAT x,
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FX_FLOAT y,
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FX_FLOAT width,
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FX_FLOAT height,
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FX_FLOAT start_angle,
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FX_FLOAT sweep_angle) {
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FX_FLOAT x0 = FXSYS_cos(sweep_angle / 2);
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FX_FLOAT y0 = FXSYS_sin(sweep_angle / 2);
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FX_FLOAT tx = ((1.0f - x0) * 4) / (3 * 1.0f);
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FX_FLOAT ty = y0 - ((tx * x0) / y0);
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FX_FLOAT px[3], py[3];
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px[0] = x0 + tx;
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py[0] = -ty;
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px[1] = x0 + tx;
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py[1] = ty;
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FX_FLOAT sn = FXSYS_sin(start_angle + sweep_angle / 2);
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FX_FLOAT cs = FXSYS_cos(start_angle + sweep_angle / 2);
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int old_count = m_pPathData->GetPointCount();
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m_pPathData->AddPointCount(3);
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FX_FLOAT bezier_x, bezier_y;
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bezier_x = x + (width * ((px[0] * cs) - (py[0] * sn)));
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bezier_y = y + (height * ((px[0] * sn) + (py[0] * cs)));
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m_pPathData->SetPoint(old_count, bezier_x, bezier_y, FXPT_BEZIERTO);
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bezier_x = x + (width * ((px[1] * cs) - (py[1] * sn)));
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bezier_y = y + (height * ((px[1] * sn) + (py[1] * cs)));
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m_pPathData->SetPoint(old_count + 1, bezier_x, bezier_y, FXPT_BEZIERTO);
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bezier_x = x + (width * FXSYS_cos(start_angle + sweep_angle));
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bezier_y = y + (height * FXSYS_sin(start_angle + sweep_angle));
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m_pPathData->SetPoint(old_count + 2, bezier_x, bezier_y, FXPT_BEZIERTO);
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}
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void CFX_PathGenerator::AddArc(FX_FLOAT x,
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FX_FLOAT y,
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FX_FLOAT width,
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FX_FLOAT height,
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FX_FLOAT start_angle,
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FX_FLOAT sweep_angle) {
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if (sweep_angle == 0) {
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return;
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}
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const FX_FLOAT bezier_arc_angle_epsilon = 0.01f;
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while (start_angle > FX_PI * 2) {
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start_angle -= FX_PI * 2;
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}
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while (start_angle < 0) {
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start_angle += FX_PI * 2;
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}
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if (sweep_angle >= FX_PI * 2) {
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sweep_angle = FX_PI * 2;
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}
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if (sweep_angle <= -FX_PI * 2) {
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sweep_angle = -FX_PI * 2;
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}
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m_pPathData->AddPointCount(1);
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m_pPathData->SetPoint(m_pPathData->GetPointCount() - 1,
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x + (width * FXSYS_cos(start_angle)),
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y + (height * FXSYS_sin(start_angle)), FXPT_MOVETO);
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FX_FLOAT total_sweep = 0, local_sweep = 0, prev_sweep = 0;
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FX_BOOL done = FALSE;
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do {
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if (sweep_angle < 0) {
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prev_sweep = total_sweep;
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local_sweep = -FX_PI / 2;
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total_sweep -= FX_PI / 2;
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if (total_sweep <= sweep_angle + bezier_arc_angle_epsilon) {
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local_sweep = sweep_angle - prev_sweep;
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done = TRUE;
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}
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} else {
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prev_sweep = total_sweep;
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local_sweep = FX_PI / 2;
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total_sweep += FX_PI / 2;
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if (total_sweep >= sweep_angle - bezier_arc_angle_epsilon) {
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local_sweep = sweep_angle - prev_sweep;
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done = TRUE;
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}
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}
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ArcTo(x, y, width, height, start_angle, local_sweep);
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start_angle += local_sweep;
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} while (!done);
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}
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void CFX_PathGenerator::AddPie(FX_FLOAT x,
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FX_FLOAT y,
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FX_FLOAT width,
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FX_FLOAT height,
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FX_FLOAT start_angle,
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FX_FLOAT sweep_angle) {
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if (sweep_angle == 0) {
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int old_count = m_pPathData->GetPointCount();
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m_pPathData->AddPointCount(2);
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m_pPathData->SetPoint(old_count, x, y, FXPT_MOVETO);
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m_pPathData->SetPoint(old_count + 1, x + (width * FXSYS_cos(start_angle)),
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y + (height * FXSYS_sin(start_angle)), FXPT_LINETO);
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return;
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}
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AddArc(x, y, width, height, start_angle, sweep_angle);
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m_pPathData->AddPointCount(1);
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m_pPathData->SetPoint(m_pPathData->GetPointCount() - 1, x, y,
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FXPT_LINETO | FXPT_CLOSEFIGURE);
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}
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