Exemplo n.º 1
0
///////////////////////////////////////////////////////////////////////////////
// Called when applying a point style on a feature geometry.  Point styles can
// be applied to all feature geometry types.
void SE_Renderer::ProcessPoint(SE_ApplyContext* ctx, SE_RenderPointStyle* style, RS_Bounds* bounds)
{
    // the feature geometry we're applying the style on...
    LineBuffer* featGeom = ctx->geometry;

    double angleRad = 0.0;
    if (style->angleControl == SE_AngleControl_FromGeometry)
    {
        switch (featGeom->geom_type())
        {
            case GeometryType_LineString:
            case GeometryType_MultiLineString:
            case GeometryType_Polygon:
            case GeometryType_MultiPolygon:
            {
                double x0, y0;
                featGeom->Centroid(LineBuffer::ctLine, &x0, &y0, &angleRad);
                break;
            }
        }
    }

    angleRad += style->angleRad;

    // also account for any viewport rotation
    angleRad += GetWorldToScreenRotation();

    SE_Matrix xform;
    bool yUp = YPointsUp();

    // see StylizationEngine::Stylize for a detailed explanation of these transforms
    SE_Matrix xformbase;
    xformbase.translate(style->offset[0], style->offset[1]);
    xformbase.rotate(yUp? angleRad : -angleRad);
    xformbase.premultiply(*ctx->xform);

    // render the points
    for (int i=0; i<featGeom->point_count(); ++i)
    {
        double x, y;
        featGeom->get_point(i, x, y);

        // transform to screen space - feature geometry is in [the original] mapping space
        WorldToScreenPoint(x, y, x, y);

        xform = xformbase;
        xform.translate(x, y);

        if (style->drawLast)
            AddLabel(featGeom, style, xform, angleRad);
        else
            DrawSymbol(style->symbol, xform, angleRad, style->addToExclusionRegion);
    }

    if (bounds)
    {
        // get the symbol bounds after applying the transforms
        bounds->minx = bounds->miny = +DBL_MAX;
        bounds->maxx = bounds->maxy = -DBL_MAX;
        for (int i=0; i<4; ++i)
        {
            RS_F_Point xfpt;
            xformbase.transform(style->bounds[i].x, style->bounds[i].y, xfpt.x, xfpt.y);
            bounds->add_point(xfpt);
        }
    }
}
void SE_PositioningAlgorithms::Default(SE_ApplyContext* applyCtx,
                                       SE_RenderStyle*  rstyle)
{
    // the style needs to contain at least one primitive
    SE_RenderPrimitiveList& prims = rstyle->symbol;
    if (prims.size() == 0)
        return;

    SE_Renderer* se_renderer = applyCtx->renderer;
    LineBuffer* geometry = applyCtx->geometry;
    SE_Matrix& xform = *applyCtx->xform;

    double cx = 0.0;
    double cy = 0.0;
    double offsetX = 0.0;
    double offsetY = 0.0;
    double angleRad = 0.0;

    switch (rstyle->type)
    {
        case SE_RenderStyle_Point:
        {
            SE_RenderPointStyle* rpStyle = (SE_RenderPointStyle*)rstyle;

            // get the feature centroid (no angle for point centroids)
            geometry->Centroid(LineBuffer::ctPoint, &cx, &cy, NULL);

            // account for the point usage angle control and offset
            angleRad = rpStyle->angleRad;
            offsetX  = rpStyle->offset[0];
            offsetY  = rpStyle->offset[1];

            break;
        }

        case SE_RenderStyle_Line:
        {
            SE_RenderLineStyle* rlStyle = (SE_RenderLineStyle*)rstyle;

            // get the feature centroid and angle
            double fAngleRad;
            geometry->Centroid(LineBuffer::ctLine, &cx, &cy, &fAngleRad);

            // account for the angle control
            angleRad = rlStyle->angleRad;
            if (rlStyle->angleControl == SE_AngleControl_FromGeometry)
                angleRad += fAngleRad;

            break;
        }

        case SE_RenderStyle_Area:
        {
            SE_RenderAreaStyle* raStyle = (SE_RenderAreaStyle*)rstyle;

            // get the feature centroid (no angle for area centroids)
            geometry->Centroid(LineBuffer::ctArea, &cx, &cy, NULL);

            // account for the angle control
            angleRad = raStyle->angleRad;

            break;
        }
    }

    // don't add a label if we can't compute the centroid
    if (_isnan(cx) || _isnan(cy))
        return;

    // need to convert centroid to screen units
    se_renderer->WorldToScreenPoint(cx, cy, cx, cy);

    // also account for any viewport rotation
    angleRad += se_renderer->GetWorldToScreenRotation();

    // see StylizationEngine::Stylize for a detailed explanation of these transforms
    bool yUp = se_renderer->YPointsUp();
    SE_Matrix xformLabel;
    xformLabel.translate(offsetX, offsetY);
    xformLabel.rotate(yUp? angleRad : -angleRad);
    xformLabel.premultiply(xform);
    xformLabel.translate(cx, cy);

    se_renderer->AddLabel(geometry, rstyle, xformLabel, angleRad);
}