JUCE/modules/juce_box2d/utils/juce_Box2DRenderer.cpp

/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

Box2DRenderer::Box2DRenderer() noexcept   : graphics (nullptr)
{
    SetFlags (e_shapeBit);
}

void Box2DRenderer::render (Graphics& g, b2World& world,
                            float left, float top, float right, float bottom,
                            const Rectangle<float>& target)
{
    graphics = &g;

    g.addTransform (AffineTransform::fromTargetPoints (left,  top,    target.getX(),     target.getY(),
                                                       right, top,    target.getRight(), target.getY(),
                                                       left,  bottom, target.getX(),     target.getBottom()));

    world.SetDebugDraw (this);
    world.DrawDebugData();
}

Colour Box2DRenderer::getColour (const b2Color& c) const
{
    return Colour::fromFloatRGBA (c.r, c.g, c.b, 1.0f);
}

float Box2DRenderer::getLineThickness() const
{
    return 0.1f;
}

static void createPath (Path& p, const b2Vec2* vertices, int32 vertexCount)
{
    p.startNewSubPath (vertices[0].x, vertices[0].y);

    for (int i = 1; i < vertexCount; ++i)
        p.lineTo (vertices[i].x, vertices[i].y);

    p.closeSubPath();
}

void Box2DRenderer::DrawPolygon (const b2Vec2* vertices, int32 vertexCount, const b2Color& color)
{
    graphics->setColour (getColour (color));

    Path p;
    createPath (p, vertices, vertexCount);
    graphics->strokePath (p, PathStrokeType (getLineThickness()));
}

void Box2DRenderer::DrawSolidPolygon (const b2Vec2* vertices, int32 vertexCount, const b2Color& color)
{
    graphics->setColour (getColour (color));

    Path p;
    createPath (p, vertices, vertexCount);
    graphics->fillPath (p);
}

void Box2DRenderer::DrawCircle (const b2Vec2& center, float32 radius, const b2Color& color)
{
    graphics->setColour (getColour (color));
    graphics->drawEllipse (center.x - radius, center.y - radius,
                           radius * 2.0f, radius * 2.0f,
                           getLineThickness());
}

void Box2DRenderer::DrawSolidCircle (const b2Vec2& center, float32 radius, const b2Vec2& /*axis*/, const b2Color& colour)
{
    graphics->setColour (getColour (colour));
    graphics->fillEllipse (center.x - radius, center.y - radius,
                           radius * 2.0f, radius * 2.0f);
}

void Box2DRenderer::DrawSegment (const b2Vec2& p1, const b2Vec2& p2, const b2Color& color)
{
    graphics->setColour (getColour (color));
    graphics->drawLine (p1.x, p1.y, p2.x, p2.y, getLineThickness());
}

void Box2DRenderer::DrawTransform (const b2Transform&)
{
}

} // namespace juce