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box2ddebugdraw.cpp
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box2ddebugdraw.cpp
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/*
* Box2D QML plugin
* Copyright (C) 2010 Nokia Corporation
*
* This file is part of the Box2D QML plugin.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, see <http://www.gnu.org/licenses/>.
*/
#include "box2ddebugdraw.h"
#include "box2dworld.h"
#include <Box2D.h>
#include <QPainter>
class DebugDraw : public b2Draw
{
public:
DebugDraw(QPainter *painter, Box2DWorld *world);
void draw();
void DrawPolygon(const b2Vec2 *vertices, int32 vertexCount,
const b2Color &color);
void DrawSolidPolygon(const b2Vec2 *vertices, int32 vertexCount,
const b2Color &color);
void DrawCircle(const b2Vec2 ¢er, float32 radius,
const b2Color &color);
void DrawSolidCircle(const b2Vec2 ¢er, float32 radius,
const b2Vec2 &axis, const b2Color &color);
void DrawSegment(const b2Vec2 &p1, const b2Vec2 &p2,
const b2Color &color);
void DrawTransform(const b2Transform &xf);
private:
QPainter *mP;
b2World *mWorld;
};
DebugDraw::DebugDraw(QPainter *painter, Box2DWorld *world)
: mP(painter)
, mWorld(world->world())
{
SetFlags(e_shapeBit |
e_jointBit |
e_aabbBit |
e_pairBit |
e_centerOfMassBit);
}
void DebugDraw::draw()
{
mWorld->SetDebugDraw(this);
mWorld->DrawDebugData();
mWorld->SetDebugDraw(0);
}
static QPointF toQPointF(const b2Vec2 &vec)
{
return QPointF(vec.x * scaleRatio,
-vec.y * scaleRatio);
}
static QColor toQColor(const b2Color &color)
{
return QColor(color.r * 255,
color.g * 255,
color.b * 255);
}
static QPolygonF toQPolygonF(const b2Vec2 *vertices, int32 vertexCount)
{
QPolygonF polygon;
polygon.reserve(vertexCount);
for (int i = 0; i < vertexCount; ++i)
polygon.append(toQPointF(vertices[i]));
return polygon;
}
void DebugDraw::DrawPolygon(const b2Vec2 *vertices, int32 vertexCount,
const b2Color &color)
{
mP->setPen(toQColor(color));
mP->setBrush(Qt::NoBrush);
mP->drawPolygon(toQPolygonF(vertices, vertexCount));
}
void DebugDraw::DrawSolidPolygon(const b2Vec2 *vertices, int32 vertexCount,
const b2Color &color)
{
mP->setPen(Qt::NoPen);
mP->setBrush(toQColor(color));
mP->drawPolygon(toQPolygonF(vertices, vertexCount));
}
void DebugDraw::DrawCircle(const b2Vec2 ¢er, float32 radius,
const b2Color &color)
{
mP->setPen(toQColor(color));
mP->setBrush(Qt::NoBrush);
mP->drawEllipse(toQPointF(center),
radius * scaleRatio,
radius * scaleRatio);
}
void DebugDraw::DrawSolidCircle(const b2Vec2 ¢er, float32 radius,
const b2Vec2 &axis, const b2Color &color)
{
Q_UNUSED(axis)
mP->setPen(Qt::NoPen);
mP->setBrush(toQColor(color));
mP->drawEllipse(toQPointF(center),
radius * scaleRatio,
radius * scaleRatio);
}
void DebugDraw::DrawSegment(const b2Vec2 &p1, const b2Vec2 &p2,
const b2Color &color)
{
mP->setPen(toQColor(color));
mP->drawLine(toQPointF(p1), toQPointF(p2));
}
void DebugDraw::DrawTransform(const b2Transform &xf)
{
Q_UNUSED(xf)
// TODO: Not sure how to draw transforms
}
Box2DDebugDraw::Box2DDebugDraw(QDeclarativeItem *parent) :
QDeclarativeItem(parent),
mWorld(0)
{
setFlag(QGraphicsItem::ItemHasNoContents, false);
}
void Box2DDebugDraw::setWorld(Box2DWorld *world)
{
if (mWorld == world)
return;
if (mWorld)
mWorld->disconnect(this);
mWorld = world;
if (mWorld)
connect(mWorld, SIGNAL(stepped()), SLOT(onWorldStepped()));
}
void Box2DDebugDraw::paint(QPainter *p, const QStyleOptionGraphicsItem *,
QWidget *)
{
if (!mWorld)
return;
// Darken the view to make the debug draw stand out more
p->fillRect(0, 0, width(), height(), QColor(0, 0, 0, 128));
DebugDraw debugDraw(p, mWorld);
debugDraw.draw();
}
void Box2DDebugDraw::onWorldStepped()
{
if (isVisible() && opacity() > 0)
update();
}