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box2ddebugdraw.cpp
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box2ddebugdraw.cpp
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/*
* box2ddebugdraw.cpp
* Copyright (c) 2010 Thorbjørn Lindeijer <[email protected]>
* Copyright (c) 2014 Moukhlynin Ruslan <[email protected]>
*
* This file is part of the Box2D QML plugin.
*
* This software is provided 'as-is', without any express or implied warranty.
* In no event will the authors be held liable for any damages arising from
* the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software in
* a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*/
#define CIRCLE_SEGMENTS_COUNT 32
#define LINE_WIDTH 1
#include "box2ddebugdraw.h"
#include "box2dworld.h"
#include <Box2D.h>
#include <QPainter>
#include <QSGNode>
#include <QSGFlatColorMaterial>
#include <QtCore/qmath.h>
class DebugDraw : public b2Draw
{
public:
DebugDraw(QSGNode *root, 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);
void setAxisScale(qreal axisScale);
private:
QSGNode *mRoot;
Box2DWorld &mWorld;
qreal mAxisScale;
QSGNode *createNode(QSGGeometry *geometry, const QColor &color, QSGNode *parent = 0);
};
DebugDraw::DebugDraw(QSGNode *root, Box2DWorld &world) :
mRoot(root),
mWorld(world)
{
}
void DebugDraw::draw()
{
mWorld.world().SetDebugDraw(this);
mWorld.world().DrawDebugData();
mWorld.world().SetDebugDraw(0);
}
static QColor toQColor(const b2Color &color)
{
return QColor(color.r * 255,
color.g * 255,
color.b * 255,
color.a * 255);
}
QSGNode *DebugDraw::createNode(QSGGeometry *geometry, const QColor &color, QSGNode *parent)
{
QSGFlatColorMaterial *material = new QSGFlatColorMaterial;
material->setColor(color);
QSGGeometryNode *node = new QSGGeometryNode;
node->setGeometry(geometry);
node->setFlag(QSGNode::OwnsGeometry);
node->setMaterial(material);
node->setFlag(QSGNode::OwnsMaterial);
if (parent)
parent->appendChildNode(node);
else
mRoot->appendChildNode(node);
return node;
}
void DebugDraw::DrawPolygon(const b2Vec2 *vertices,
int32 vertexCount,
const b2Color &color)
{
QSGGeometry *geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(),
vertexCount);
geometry->setDrawingMode(GL_LINE_LOOP);
geometry->setLineWidth(LINE_WIDTH);
QSGGeometry::Point2D *points = geometry->vertexDataAsPoint2D();
for (int i = 0; i < vertexCount; ++i) {
QPointF point = mWorld.toPixels(vertices[i]);
points[i].set(point.x(), point.y());
}
createNode(geometry, toQColor(color));
}
void DebugDraw::DrawSolidPolygon(const b2Vec2 *vertices,
int32 vertexCount,
const b2Color &color)
{
QSGGeometry *geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(),
vertexCount);
geometry->setDrawingMode(GL_TRIANGLE_FAN);
geometry->setLineWidth(LINE_WIDTH);
QSGGeometry::Point2D *points = geometry->vertexDataAsPoint2D();
for (int i = 0; i < vertexCount; ++i) {
QPointF point = mWorld.toPixels(vertices[i]);
points[i].set(point.x(), point.y());
}
createNode(geometry, toQColor(color));
}
void DebugDraw::DrawCircle(const b2Vec2 ¢er,
float32 radius,
const b2Color &color)
{
QSGGeometry *geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(),
CIRCLE_SEGMENTS_COUNT);
geometry->setDrawingMode(GL_LINE_LOOP);
geometry->setLineWidth(LINE_WIDTH);
QPointF centerInPixels = mWorld.toPixels(center);
qreal radiusInPixels = mWorld.toPixels(radius);
QSGGeometry::Point2D *points = geometry->vertexDataAsPoint2D();
for (int i = 0; i < CIRCLE_SEGMENTS_COUNT; ++i) {
float theta = i * 2 * M_PI / (CIRCLE_SEGMENTS_COUNT - 2);
points[i].set(centerInPixels.x() + radiusInPixels * qCos(theta),
centerInPixels.y() + radiusInPixels * qSin(theta));
}
createNode(geometry, toQColor(color));
}
void DebugDraw::DrawSolidCircle(const b2Vec2 ¢er, float32 radius,
const b2Vec2 &axis, const b2Color &color)
{
QSGGeometry *geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(),
CIRCLE_SEGMENTS_COUNT);
geometry->setDrawingMode(GL_TRIANGLE_FAN);
geometry->setLineWidth(LINE_WIDTH);
QPointF centerInPixels = mWorld.toPixels(center);
QPointF axisInPixels = mWorld.toPixels(axis);
qreal radiusInPixels = mWorld.toPixels(radius);
axisInPixels.setX(centerInPixels.x() + radius * axisInPixels.x());
axisInPixels.setY(centerInPixels.y() + radius * axisInPixels.y());
QSGGeometry::Point2D *points = geometry->vertexDataAsPoint2D();
points[0].set(centerInPixels.x(), centerInPixels.y());
for (int i = 1; i < CIRCLE_SEGMENTS_COUNT; ++i) {
float theta = i * 2 * M_PI / (CIRCLE_SEGMENTS_COUNT - 2);
points[i].set(centerInPixels.x() + radiusInPixels * qCos(theta),
centerInPixels.y() + radiusInPixels * qSin(theta));
}
QSGNode * node = createNode(geometry,toQColor(color));
QSGGeometry *axisGeometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 2);
axisGeometry->setDrawingMode(GL_LINES);
axisGeometry->setLineWidth(LINE_WIDTH);
axisGeometry->vertexDataAsPoint2D()[0].set(centerInPixels.x(), centerInPixels.y());
axisGeometry->vertexDataAsPoint2D()[1].set(axisInPixels.x(), axisInPixels.y());
createNode(axisGeometry, qRgb(200, 64, 0), node);
}
void DebugDraw::DrawSegment(const b2Vec2 &p1,
const b2Vec2 &p2,
const b2Color &color)
{
QPointF p1InPixels = mWorld.toPixels(p1);
QPointF p2InPixels = mWorld.toPixels(p2);
QSGGeometry *geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 2);
geometry->setDrawingMode(GL_LINES);
geometry->setLineWidth(LINE_WIDTH);
geometry->vertexDataAsPoint2D()[0].set(p1InPixels.x(), p1InPixels.y());
geometry->vertexDataAsPoint2D()[1].set(p2InPixels.x(), p2InPixels.y());
createNode(geometry, toQColor(color));
}
void DebugDraw::DrawTransform(const b2Transform &xf)
{
QPointF p1 = mWorld.toPixels(xf.p);
QPointF p2 = mWorld.toPixels(xf.q.GetXAxis());
p2 = QPointF(p1.x() + mAxisScale * p2.x(),
p1.y() + mAxisScale * p2.y());
QSGGeometry *geometryX = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 2);
geometryX->setDrawingMode(GL_LINES);
geometryX->setLineWidth(LINE_WIDTH);
geometryX->vertexDataAsPoint2D()[0].set(p1.x(), p1.y());
geometryX->vertexDataAsPoint2D()[1].set(p2.x(), p2.y());
createNode(geometryX,Qt::blue);
p2 = mWorld.toPixels(xf.q.GetYAxis());
p2 = QPointF(p1.x() + mAxisScale * p2.x(),
p1.y() + mAxisScale * p2.y());
QSGGeometry *geometryY = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 2);
geometryY->setDrawingMode(GL_LINES);
geometryY->setLineWidth(LINE_WIDTH);
geometryY->vertexDataAsPoint2D()[0].set(p1.x(), p1.y());
geometryY->vertexDataAsPoint2D()[1].set(p2.x(), p2.y());
createNode(geometryY, Qt::yellow);
}
void DebugDraw::setAxisScale(qreal axisScale)
{
mAxisScale = axisScale;
}
Box2DDebugDraw::Box2DDebugDraw(QQuickItem *parent) :
QQuickItem (parent),
mWorld(0),
mAxisScale(0.5),
mFlags(Everything)
{
setFlag(QQuickItem::ItemHasContents, true);
}
void Box2DDebugDraw::setAxisScale(qreal axisScale)
{
if (mAxisScale != axisScale) {
mAxisScale = axisScale;
emit axisScaleChanged();
}
}
void Box2DDebugDraw::setFlags(DebugFlag flags)
{
if (mFlags != flags) {
mFlags = flags;
emit flagsChanged();
}
}
void Box2DDebugDraw::setWorld(Box2DWorld *world)
{
if (mWorld == world)
return;
if (mWorld)
mWorld->disconnect(this);
mWorld = world;
if (mWorld)
connect(mWorld, SIGNAL(stepped()), SLOT(onWorldStepped()));
emit worldChanged();
}
QSGNode *Box2DDebugDraw::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
{
if (oldNode)
delete oldNode;
if (!mWorld)
return 0;
QSGTransformNode *root = new QSGTransformNode;
DebugDraw debugDraw(root, *mWorld);
debugDraw.SetFlags(mFlags);
debugDraw.setAxisScale(mAxisScale);
debugDraw.draw();
return root;
}
void Box2DDebugDraw::onWorldStepped()
{
if (isVisible() && opacity() > 0)
update();
}