cocos2d-x3.0 经常使用绘图方法

HelloWorldScene.h

例如，下面的代码被添加：

protected:
    void onDraw(const kmMat4 &transform, bool transformUpdated);
    CustomCommand _customCommand;

HelloWorldScene.cpp

void HelloWorld::draw(cocos2d::Renderer *renderer, const kmMat4 &transform, bool transformUpdated)
{
    _customCommand.init(1);
    _customCommand.func = CC_CALLBACK_0(HelloWorld::onDraw, this,transform,transformUpdated);
    renderer->addCommand(&_customCommand);
}

void HelloWorld::onDraw(const kmMat4 &transform, bool transformUpdated)
{
    kmGLPushMatrix();
    kmGLLoadMatrix(&transform);

    /*直线*/
    CHECK_GL_ERROR_DEBUG();
    DrawPrimitives::drawLine(VisibleRect::leftBottom(), VisibleRect::rightTop());

    CHECK_GL_ERROR_DEBUG();

    glLineWidth( 5.0f );
    DrawPrimitives::setDrawColor4B(255,0,0,255);
    DrawPrimitives::drawLine( Point(0, 0), Point(100, 100) );

// draw big point in the center
    DrawPrimitives::setPointSize(64);
    DrawPrimitives::setDrawColor4B(100, 0, 255, 128);
    DrawPrimitives::drawPoint(VisibleRect::center());
     CHECK_GL_ERROR_DEBUG();

    // draw 4 small points
    Point points[] = { Point(60,60), Point(70,70), Point(160,70), Point(170,60) };
    DrawPrimitives::setPointSize(10);
    DrawPrimitives::setDrawColor4B(0,10,255,255);
    DrawPrimitives::drawPoints( points, 4);

    CHECK_GL_ERROR_DEBUG();

    // draw a green circle with 10 segments
    glLineWidth(16);
    DrawPrimitives::setDrawColor4B(0, 255, 0, 255);
    DrawPrimitives::drawCircle( VisibleRect::center(), 100, 0, 10, false);

    CHECK_GL_ERROR_DEBUG();

    // draw a green circle with 50 segments with line to center
    glLineWidth(2);
    DrawPrimitives::setDrawColor4B(0, 255, 255, 255);
    DrawPrimitives::drawCircle( VisibleRect::center(), 150, CC_DEGREES_TO_RADIANS(90), 50, false);

    CHECK_GL_ERROR_DEBUG();

    // draw a pink solid circle with 50 segments
    glLineWidth(2);
    DrawPrimitives::setDrawColor4B(255, 0, 255, 255);
    DrawPrimitives::drawSolidCircle( VisibleRect::center() + Point(140,0), 40, CC_DEGREES_TO_RADIANS(90), 50, 1.0f, 1.0f);

    CHECK_GL_ERROR_DEBUG();

    // open yellow poly
    DrawPrimitives::setDrawColor4B(255, 255, 0, 255);
    glLineWidth(5);
    Point vertices[] = { Point(10,10), Point(50,50), Point(100,50), Point(150,100), Point(200,150) };
    DrawPrimitives::drawPoly( vertices, 5, false);

    CHECK_GL_ERROR_DEBUG();

    // filled poly
    glLineWidth(1);
    Point filledVertices[] = { Point(0,120), Point(50,120), Point(50,170), Point(25,200), Point(0,170) };
    DrawPrimitives::drawSolidPoly(filledVertices, 5, Color4F(0.5f, 0.5f, 1, 1 ) );

    // closed purble poly
    DrawPrimitives::setDrawColor4B(255, 0, 255, 255);
    glLineWidth(2);
    Point vertices2[] = { Point(30,130), Point(30,230), Point(50,200) };
    DrawPrimitives::drawPoly( vertices2, 3, true);

    CHECK_GL_ERROR_DEBUG();

    // draw quad bezier path
    DrawPrimitives::drawQuadBezier(VisibleRect::leftTop(), VisibleRect::center(), VisibleRect::rightTop(), 50);

    CHECK_GL_ERROR_DEBUG();

    // draw cubic bezier path
    DrawPrimitives::drawCubicBezier(VisibleRect::center(), Point(VisibleRect::center().x+30,VisibleRect::center().y+150), Point(VisibleRect::center().x+60,VisibleRect::center().y-300),Point(VisibleRect::center().x+90,VisibleRect::center().y+150),100);

    CHECK_GL_ERROR_DEBUG();

    //draw a solid polygon
    Point vertices3[] = {Point(60,160), Point(70,190), Point(100,190), Point(90,160)};
    DrawPrimitives::drawSolidPoly( vertices3, 4, Color4F(1,1,0,1) );

    CHECK_GL_ERROR_DEBUG();

    //end draw
    kmGLPopMatrix();
}