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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "xfa/fxgraphics/cfx_path_generator.h"
#include "core/fxge/cfx_pathdata.h"
#include "core/fxge/cfx_renderdevice.h"
CFX_PathGenerator::CFX_PathGenerator() : m_pPathData(new CFX_PathData) {}
CFX_PathGenerator::~CFX_PathGenerator() {}
void CFX_PathGenerator::AddPathData(CFX_PathData* pPathData) {
if (!pPathData)
return;
m_pPathData->Append(pPathData, nullptr);
}
void CFX_PathGenerator::MoveTo(const CFX_PointF& point) {
m_pPathData->AppendPoint(point, FXPT_TYPE::MoveTo, false);
}
void CFX_PathGenerator::LineTo(const CFX_PointF& point) {
m_pPathData->AppendPoint(point, FXPT_TYPE::LineTo, false);
}
void CFX_PathGenerator::BezierTo(const CFX_PointF& c1,
const CFX_PointF& c2,
const CFX_PointF& to) {
m_pPathData->AppendPoint(c1, FXPT_TYPE::BezierTo, false);
m_pPathData->AppendPoint(c2, FXPT_TYPE::BezierTo, false);
m_pPathData->AppendPoint(to, FXPT_TYPE::BezierTo, false);
}
void CFX_PathGenerator::Close() {
m_pPathData->ClosePath();
}
void CFX_PathGenerator::AddLine(const CFX_PointF& p1, const CFX_PointF& p2) {
m_pPathData->AppendPoint(p1, FXPT_TYPE::MoveTo, false);
m_pPathData->AppendPoint(p2, FXPT_TYPE::LineTo, false);
}
void CFX_PathGenerator::AddBezier(const CFX_PointF& p1,
const CFX_PointF& c1,
const CFX_PointF& c2,
const CFX_PointF& p2) {
m_pPathData->AppendPoint(p1, FXPT_TYPE::MoveTo, false);
m_pPathData->AppendPoint(c1, FXPT_TYPE::BezierTo, false);
m_pPathData->AppendPoint(c2, FXPT_TYPE::BezierTo, false);
m_pPathData->AppendPoint(p2, FXPT_TYPE::BezierTo, false);
}
void CFX_PathGenerator::AddRectangle(FX_FLOAT x1,
FX_FLOAT y1,
FX_FLOAT x2,
FX_FLOAT y2) {
m_pPathData->AppendRect(x1, y1, x2, y2);
}
void CFX_PathGenerator::AddEllipse(const CFX_PointF& pos,
const CFX_SizeF& size) {
AddArc(pos, size, 0, FX_PI * 2);
}
void CFX_PathGenerator::ArcTo(const CFX_PointF& pos,
const CFX_SizeF& size,
FX_FLOAT start_angle,
FX_FLOAT sweep_angle) {
FX_FLOAT x0 = FXSYS_cos(sweep_angle / 2);
FX_FLOAT y0 = FXSYS_sin(sweep_angle / 2);
FX_FLOAT tx = ((1.0f - x0) * 4) / (3 * 1.0f);
FX_FLOAT ty = y0 - ((tx * x0) / y0);
FX_FLOAT px[3], py[3];
px[0] = x0 + tx;
py[0] = -ty;
px[1] = x0 + tx;
py[1] = ty;
FX_FLOAT sn = FXSYS_sin(start_angle + sweep_angle / 2);
FX_FLOAT cs = FXSYS_cos(start_angle + sweep_angle / 2);
CFX_PointF bezier;
bezier.x = pos.x + (size.width * ((px[0] * cs) - (py[0] * sn)));
bezier.y = pos.y + (size.height * ((px[0] * sn) + (py[0] * cs)));
m_pPathData->AppendPoint(bezier, FXPT_TYPE::BezierTo, false);
bezier.x = pos.x + (size.width * ((px[1] * cs) - (py[1] * sn)));
bezier.y = pos.y + (size.height * ((px[1] * sn) + (py[1] * cs)));
m_pPathData->AppendPoint(bezier, FXPT_TYPE::BezierTo, false);
bezier.x = pos.x + (size.width * FXSYS_cos(start_angle + sweep_angle));
bezier.y = pos.y + (size.height * FXSYS_sin(start_angle + sweep_angle));
m_pPathData->AppendPoint(bezier, FXPT_TYPE::BezierTo, false);
}
void CFX_PathGenerator::AddArc(const CFX_PointF& pos,
const CFX_SizeF& size,
FX_FLOAT start_angle,
FX_FLOAT sweep_angle) {
if (sweep_angle == 0)
return;
const FX_FLOAT bezier_arc_angle_epsilon = 0.01f;
while (start_angle > FX_PI * 2)
start_angle -= FX_PI * 2;
while (start_angle < 0)
start_angle += FX_PI * 2;
if (sweep_angle >= FX_PI * 2)
sweep_angle = FX_PI * 2;
if (sweep_angle <= -FX_PI * 2)
sweep_angle = -FX_PI * 2;
m_pPathData->AppendPoint(
pos + CFX_PointF(size.width * FXSYS_cos(start_angle),
size.height * FXSYS_sin(start_angle)),
FXPT_TYPE::MoveTo, false);
FX_FLOAT total_sweep = 0;
FX_FLOAT local_sweep = 0;
FX_FLOAT prev_sweep = 0;
bool done = false;
do {
if (sweep_angle < 0) {
prev_sweep = total_sweep;
local_sweep = -FX_PI / 2;
total_sweep -= FX_PI / 2;
if (total_sweep <= sweep_angle + bezier_arc_angle_epsilon) {
local_sweep = sweep_angle - prev_sweep;
done = true;
}
} else {
prev_sweep = total_sweep;
local_sweep = FX_PI / 2;
total_sweep += FX_PI / 2;
if (total_sweep >= sweep_angle - bezier_arc_angle_epsilon) {
local_sweep = sweep_angle - prev_sweep;
done = true;
}
}
ArcTo(pos, size, start_angle, local_sweep);
start_angle += local_sweep;
} while (!done);
}
void CFX_PathGenerator::AddPie(const CFX_PointF& pos,
const CFX_SizeF& size,
FX_FLOAT start_angle,
FX_FLOAT sweep_angle) {
if (sweep_angle == 0) {
m_pPathData->AppendPoint(pos, FXPT_TYPE::MoveTo, false);
m_pPathData->AppendPoint(
pos + CFX_PointF(size.width * FXSYS_cos(start_angle),
size.height * FXSYS_sin(start_angle)),
FXPT_TYPE::LineTo, false);
return;
}
AddArc(pos, size, start_angle, sweep_angle);
m_pPathData->AppendPoint(pos, FXPT_TYPE::LineTo, true);
}
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