C++ drawLines函数代码示例

void BurstShot::draw(QPainter *painter)
{
    painter->save();
    QColor whiteBeam(0,255,255,255);
    QColor blackBeam(255,0,0,255);

    QColor *currentColor = polarity == WHITE? &whiteBeam: &blackBeam;
    currentColor->setAlphaF(0.25f);
    QPen pen(*currentColor, 15, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
    painter->setPen(pen);
    drawLines(painter, 15);
    currentColor->setAlphaF(0.5f);
    pen.setColor(*currentColor);
    pen.setWidth(4);
    painter->setPen(pen);
    drawLines(painter, 10);
    pen.setColor(polarity == WHITE? Qt::white : Qt::black);
    pen.setWidth(2);
    painter->setPen(pen);
    drawLines(painter, 5);


    //debug
//    pen.setColor(Qt::green);
//    painter->setPen(pen);
//    painter->drawRect(hitBox);

    painter->restore();
}

void drawRect(int minx, int miny, int maxx, int maxy)
{
	drawLines(minx, miny, maxx, miny);
	drawLines(maxx, miny, maxx, maxy);
	drawLines(minx, maxy, maxx, maxy);
	drawLines(minx, miny, minx, maxy);
}

void QwtCurve::drawCurve(QPainter *painter, int style,
    const QwtDiMap &xMap, const QwtDiMap &yMap, int from, int to)
{
    switch (style)
    {
        case NoCurve:
            break;
        case Lines:
            drawLines(painter, xMap, yMap, from, to);
            break;
        case Sticks:
            drawSticks(painter, xMap, yMap, from, to);
            break;
        case Steps:
            drawSteps(painter, xMap, yMap, from, to);
            break;
        case Spline:
            if ( from > 0 || to < dataSize() - 1 )
                drawLines(painter, xMap, yMap, from, to);
            else
                drawSpline(painter, xMap, yMap);
            break;
        case Dots:
            drawDots(painter, xMap, yMap, from, to);
            break;
        default:
            break;
    }
}

void redraw(void)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    if(hexflag)
	draw_hexcube();

    glColor3f(1.0, 0.0, 0.0);
    drawLines(rp, rv);
    sphdraw(rv[rp]);

    glColor3f(0.0, 0.0, 1.0);
    drawLines(bp, bv);
    sphdraw(bv[bp]);
	
    glColor3f(0.0, 1.0, 0.0);
    drawLines(gp, gv);
    sphdraw(gv[gp]);

    glColor3f(1.0, 0.0, 1.0);
    drawLines(yp, yv);
    sphdraw(yv[yp]);

    glColor3f(0.0, 1.0, 1.0);
    drawLines(mp, mv);
    sphdraw(mv[mp]);

    glutSwapBuffers();
}

void
ClipObject::draw(QGLViewer *viewer,
		 bool backToFront, float widgetSize)
{
  m_size = widgetSize;
  computeTscale();

  if (!m_show)
    return;

  if (m_imagePresent ||
      m_captionPresent ||
      (m_gridX > 0 && m_gridY > 0) )
    {
      if (m_gridX > 0 && m_gridY > 0)
	drawGrid();

      if (m_imagePresent || m_captionPresent)
	drawCaptionImage();

      if (m_active) drawLines(viewer, backToFront);
    }
  else
    drawLines(viewer, backToFront);
}

// 点列からBezier曲線を太く描く 
void display(void)
{
  float c[2000][2];  // 曲線上の点列を格納する配列
  int  i,j, j2, k;

  glClear(GL_COLOR_BUFFER_BIT); // 画面消去
  drawPoints( pt,np );
  drawLines( pt,np );
  // 以下の5行を消去して、Bezier曲線上の点列を生成して配列 c[][2]に格納すること
  if( np < 3 ){ glFlush(); return; }
  //for( i=0,j=0; i<np-1; i++,j++ ){
  //  c[j][0] = (pt[i][0] + pt[i+1][0])/2.;   // x 座標値
  //  c[j][1] = (pt[i][1] + pt[i+1][1])/2.;   // y 座標値
  //}
  for(i=0,j=0; i<np-3; i+=3) {
    for(j2=0; j2<=precision; j++,j2++) {
      double t = (double)j2/precision;
      for( k=0; k<2; k++) {
        c[j][k] = ((pow(1-t,3) * pt[i][k]) + ((3*pow(t,3) - 6*t*t + 4) * pt[i+1][k]) 
          + ((-3*pow(t,3) + 3*t*t + 3*t + 1) * pt[i+2][k]) + (pow(t,3) * pt[i+3][k])) / 6;
      }
    }
  }
  glLineWidth(3.); // 線の太さを3pixels にする
  drawLines( c,j );// 配列cの中のj個の点を結んで折れ線を描く
  glLineWidth(1.); // 線の太さを1に戻す
  glFlush();       // 画面に出力
}

static void drawLines(Node p, int x, int y) {  
    if (p->kids[0]) {
        drawLines(p->kids[0], x + p->x.centre, y + Y_SCALE);
        drawLine(x + p->x.centre, y, x + p->x.centre + p->kids[0]->x.centre, y + Y_SCALE);
    }
    if (p->kids[1]) {   
        drawLines(p->kids[1], x + p->x.centre, y + Y_SCALE);
        drawLine(x + p->x.centre, y, x + p->x.centre + p->kids[1]->x.centre, y + Y_SCALE);
    }
}

void MoonWalker::render(VoodooGraphics graphics, int elapsed)
{
    graphics.painter()->save();

    // если нужно создать наклон для машинки

    if(position()->x() >= 0 && position()->x() <= 30)
    {
        setAlpha(1);
    } else if (position()->x() >= 30 && position()->x() <= 50)
    {
        setAlpha(2);
    } else if (position()->x() >= 100 && position()->x() <= 300)
    {
        setAlpha(-1);
    } else if (position()->x() >= 300 && position()->x() <= 510)
    {
        setAlpha(1);
    } else if (position()->x() >= 510 && position()->x() <= 800)
    {
        setAlpha(-4);
    }

    // тело машины
    drawLines(graphics, lines1);
    // кабинка
    drawLines(graphics, lines2);
    // антенна
    drawLines(graphics, lines3);

    QPoint point;
    qint32 radius = 1 * scale();
    for(int i = 0; i < 4; i++)
    {
        point = graphics.rotate(10 * scale() - i * radius * 2, 7 * scale(), alpha());
        graphics.drawCircle(point.x() + position()->x(), point.y() + position()->y(), radius);
        graphics.drawCircle(point.x() + position()->x(), point.y() + position()->y(), elapsed / 160);
    }

    // антенна
    point = graphics.rotate(12 * scale(), 0, alpha());
    graphics.drawCircle(position()->x() + point.x(), position()->y() + point.y(), 1 * scale());
    graphics.drawCircle(position()->x() + point.x(), position()->y() + point.y(), 5);
    graphics.drawCircle(position()->x() + point.x(), position()->y() + point.y(), elapsed / 20);

    if (position()->x() >= width() + 10)
    {
        setPosition(0, position()->y());
        setIterator(0);
    }

    setPosition(iterator() + 1, position()->y());
    setIterator(iterator() + 1);
    graphics.painter()->restore();
}

/*!
  \brief Draw the line part (without symbols) of a curve interval.
  \param painter Painter
  \param style curve style, see QwtPlotCurve::CurveStyle
  \param xMap x map
  \param yMap y map
  \param canvasRect Contents rectangle of the canvas
  \param from index of the first point to be painted
  \param to index of the last point to be painted
  \sa draw(), drawDots(), drawLines(), drawSteps(), drawSticks()
*/
void QwtPlotCurve::drawCurve( QPainter *painter, int style,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, int from, int to ) const
{
    switch ( style )
    {
        case Lines:
            if ( testCurveAttribute( Fitted ) )
            {
                // we always need the complete
                // curve for fitting
                from = 0;
                to = dataSize() - 1;
            }
            drawLines( painter, xMap, yMap, canvasRect, from, to );
            break;
        case Sticks:
            drawSticks( painter, xMap, yMap, canvasRect, from, to );
            break;
        case Steps:
            drawSteps( painter, xMap, yMap, canvasRect, from, to );
            break;
        case Dots:
            drawDots( painter, xMap, yMap, canvasRect, from, to );
            break;
        case LinesAndDots:
            {
                 if ( testCurveAttribute( Fitted ) )
                 {
                     from = 0;
                     to = dataSize() - 1;
                 }
                 drawLines( painter, xMap, yMap, canvasRect, from, to );

                 QPen prev_pen = painter->pen();
                 QPen new_pen  = prev_pen;
                 new_pen.setWidth( prev_pen.width() * 3);

                 painter->setPen( new_pen );
                 drawDots( painter, xMap, yMap, canvasRect, from, to );
                 painter->setPen( prev_pen );
             }
            break;
        case NoCurve:
        default:
            break;
    }
}

int main(int argc, char *argv[])
{
	char *iim, *idb, * oim;
	ObjectDB newobjs, known;
	Image im;

	if (argc != 4) {
		fprintf(stderr, "usage: %s <input labeled image> <input database> <output image>", argv[0]);
	}

	iim=argv[1];
	idb=argv[2];
	oim=argv[3];

	readImage(&im, iim);
	readDatabase(&known, idb); /* get the database of known objects */
	makeODB(&newobjs, getColors(&im)); /* create the database for the input image */
	getObjects(&im, &newobjs); /* fill the database for the input image */
	filterObjects(&im, &newobjs, &known); /* find known objects in the database and throw away those unknown */
	drawLines(&im, &newobjs); /* draw lines in the input image */
	writeImage(&im, oim); /* write the output image */

	free(newobjs.objs);
	free(known.objs);
	free(im.data);

	return 0;
}

/*!
  Draw a subset of the histogram samples

  \param painter Painter
  \param xMap Maps x-values into pixel coordinates.
  \param yMap Maps y-values into pixel coordinates.
  \param canvasRect Contents rect of the canvas
  \param from Index of the first sample to be painted
  \param to Index of the last sample to be painted. If to < 0 the
         series will be painted to its last sample.

  \sa drawOutline(), drawLines(), drawColumns
*/
void QwtPlotHistogram::drawSeries( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &, int from, int to ) const
{
    if ( !painter || dataSize() <= 0 )
        return;

    if ( to < 0 )
        to = dataSize() - 1;

    switch ( d_data->style )
    {
        case Outline:
            drawOutline( painter, xMap, yMap, from, to );
            break;
        case Lines:
            drawLines( painter, xMap, yMap, from, to );
            break;
        case Columns:
            drawColumns( painter, xMap, yMap, from, to );
            break;
        default:
            break;
    }
}

void CanvasWidget::drawLine(const video::Color& color, float width, bool smoothLine, const Vector2& from, const Vector2& to)
{
	Vector2 vertices[2];
	vertices[0] = from;
	vertices[1] = to;
	drawLines(color, width, smoothLine, vertices, 2);
}

void QGLView::drawDrawables(QGLView::ModelType type)
{
    if (type == NoType)
    {
        QMapIterator<ModelType, QList<Parameters*>* > i(m_drawableMap);
        while (i.hasNext()) {
            i.next();
            drawDrawables(i.key());
        }
    }
    else
    {
        switch (type)
        {
        case Cube:
        case Cylinder:
        case Cone:
        case Sphere:
            drawModelVertices(type);
            break;
        case Text:
            drawTexts();
            break;
        case Line:
            drawLines();
            break;
        default:
            return;
        }
    }
}

/*!
  \brief Draw the line part (without symbols) of a curve interval.
  \param painter Painter
  \param style curve style, see QwtPlotCurve::CurveStyle
  \param xMap x map
  \param yMap y map
  \param canvasRect Contents rectangle of the canvas
  \param from index of the first point to be painted
  \param to index of the last point to be painted
  \sa draw(), drawDots(), drawLines(), drawSteps(), drawSticks()
*/
void QwtPlotCurve::drawCurve( QPainter *painter, int style,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect, int from, int to ) const
{
    switch ( style )
    {
        case Lines:
            if ( testCurveAttribute( Fitted ) )
            {
                // we always need the complete
                // curve for fitting
                from = 0;
                to = dataSize() - 1;
            }
            drawLines( painter, xMap, yMap, canvasRect, from, to );
            break;
        case Sticks:
            drawSticks( painter, xMap, yMap, canvasRect, from, to );
            break;
        case Steps:
            drawSteps( painter, xMap, yMap, canvasRect, from, to );
            break;
        case Dots:
            drawDots( painter, xMap, yMap, canvasRect, from, to );
            break;
        case NoCurve:
        default:
            break;
    }
}

void renderDemo(struct NVGcontext* vg, float mx, float my, float width, float height,
				float t, int blowup, struct DemoData* data)
{
	float x,y,popy;

	drawEyes(vg, width - 250, 50, 150, 100, mx, my, t);
	drawParagraph(vg, width - 450, 50, 150, 100, mx, my);
	drawGraph(vg, 0, height/2, width, height/2, t);
	drawColorwheel(vg, width - 300, height - 300, 250.0f, 250.0f, t);

	// Line joints
	drawLines(vg, 50, height-50, 600, 50, t);

	// Line caps
	drawWidths(vg, 10, 50, 30);

	// Line caps
	drawCaps(vg, 10, 300, 30);

	nvgSave(vg);
	if (blowup) {
		nvgRotate(vg, sinf(t*0.3f)*5.0f/180.0f*NVG_PI);
		nvgScale(vg, 2.0f, 2.0f);
	}

	// Widgets
	drawWindow(vg, "Widgets `n Stuff", 50, 50, 300, 400);
	x = 60; y = 95;
	drawSearchBox(vg, "Search", x,y,280,25);
	y += 40;
	drawDropDown(vg, "Effects", x,y,280,28);
	popy = y + 14;
	y += 45;

	// Form
	drawLabel(vg, "Login", x,y, 280,20);
	y += 25;
	drawEditBox(vg, "Email",  x,y, 280,28);
	y += 35;
	drawEditBox(vg, "Password", x,y, 280,28);
	y += 38;
	drawCheckBox(vg, "Remember me", x,y, 140,28);
	drawButton(vg, ICON_LOGIN, "Sign in", x+138, y, 140, 28, nvgRGBA(0,96,128,255));
	y += 45;

	// Slider
	drawLabel(vg, "Diameter", x,y, 280,20);
	y += 25;
	drawEditBoxNum(vg, "123.00", "px", x+180,y, 100,28);
	drawSlider(vg, 0.4f, x,y, 170,28);
	y += 55;

	drawButton(vg, ICON_TRASH, "Delete", x, y, 160, 28, nvgRGBA(128,16,8,255));
	drawButton(vg, 0, "Cancel", x+170, y, 110, 28, nvgRGBA(0,0,0,0));

	// Thumbnails box
	drawThumbnails(vg, 365, popy-30, 160, 300, data->images, 12, t);

	nvgRestore(vg);
}