C++ cairo_matrix_scale函数代码示例

static void
draw_text (cairo_t *cr)
{
    cairo_matrix_t tm;

    /* skew */
    cairo_matrix_init (&tm, 1, 0,
                       -0.25, 1,
                       0, 0);
    cairo_matrix_scale (&tm, FONT_SIZE, FONT_SIZE);
    cairo_set_font_matrix (cr, &tm);

    cairo_new_path (cr);
    cairo_move_to (cr, 50, SIZE-PAD);
    cairo_show_text (cr, "A");

    /* rotate and scale */
    cairo_matrix_init_rotate (&tm, M_PI / 2);
    cairo_matrix_scale (&tm, FONT_SIZE, FONT_SIZE * 2.0);
    cairo_set_font_matrix (cr, &tm);

    cairo_new_path (cr);
    cairo_move_to (cr, PAD, PAD + 25);
    cairo_show_text (cr, "A");

    cairo_matrix_init_rotate (&tm, M_PI / 2);
    cairo_matrix_scale (&tm, FONT_SIZE * 2.0, FONT_SIZE);
    cairo_set_font_matrix (cr, &tm);

    cairo_new_path (cr);
    cairo_move_to (cr, PAD, PAD + 50);
    cairo_show_text (cr, "A");
}

void
ge_cairo_mirror (cairo_t     *cr,
                 CairoMirror  mirror,
                 gint        *x,
                 gint        *y,
                 gint        *width,
                 gint        *height)
{
	cairo_matrix_t matrix;
	
	cairo_matrix_init_identity (&matrix);
	
	cairo_translate (cr, *x, *y);
	*x = 0;
	*y = 0;
	
	if (mirror & CR_MIRROR_HORIZONTAL)
	{
		cairo_matrix_scale (&matrix, -1, 1);
		*x = -*width;
	}
	if (mirror & CR_MIRROR_VERTICAL)
	{
		cairo_matrix_scale (&matrix, 1, -1);
		*y = -*height;
	}

	cairo_transform (cr, &matrix);
}

void wxGISDisplay::InitTransformMatrix(void)
{
	m_dFrameCenterX = m_oDeviceFrameRect.GetWidth() / 2;
	m_dFrameCenterY = m_oDeviceFrameRect.GetHeight() / 2;
	double dWorldCenterX = (m_CurrentBounds.MaxX - m_CurrentBounds.MinX) / 2;
	double dWorldCenterY = (m_CurrentBounds.MaxY - m_CurrentBounds.MinY) / 2;

	//origin (UL corner)
	m_dOrigin_X = m_dCacheCenterX - m_dFrameCenterX;
	m_dOrigin_Y = m_dCacheCenterY - m_dFrameCenterY;
	//get scale
	double dScaleX = fabs(m_dFrameCenterX / dWorldCenterX);
	double dScaleY = fabs(m_dFrameCenterY / dWorldCenterY);
    m_dScale = wxMin(dScaleX, dScaleY);

	double dWorldDeltaX = dWorldCenterX + m_CurrentBounds.MinX;
	double dWorldDeltaY = dWorldCenterY + m_CurrentBounds.MinY;

	double dWorldDeltaXSt = m_dScale * dWorldDeltaX;// + m_dAngleRad * dWorldDeltaY;
	double dWorldDeltaYSt = m_dScale * dWorldDeltaY;//m_dAngleRad * dWorldDeltaX +

	//double dCenterX = m_dCacheCenterX - dWorldDeltaXSt;//(dWorldCenterX + m_CurrentBounds.MinX) * dScale;//
	//double dCenterY = m_dCacheCenterY + dWorldDeltaYSt;//(dWorldCenterY + m_CurrentBounds.MinY) * dScale;//
	m_dFrameXShift = m_dFrameCenterX - dWorldDeltaXSt;//(dWorldCenterX + m_CurrentBounds.MinX) * dScale;//
	m_dFrameYShift = m_dFrameCenterY + dWorldDeltaYSt;//(dWorldCenterY + m_CurrentBounds.MinY) * dScale;//

//	cairo_matrix_init (m_pMatrix, 1, 0, 0, 1, m_dCacheCenterX, m_dCacheCenterY);
	//cairo_matrix_init (m_pMatrix, dScale, 0.0, 0.0, -dScale, dCenterX, dCenterY);
	cairo_matrix_init_translate (m_pMatrix, m_dCacheCenterX, m_dCacheCenterY);
	//rotate
	//cairo_matrix_rotate(m_pMatrix, 45.0 * M_PI / 180.0);
	if(!IsDoubleEquil(m_dAngleRad, 0.0))
	//{
		//cairo_matrix_translate(m_pMatrix, dWorldDeltaXSt, dWorldDeltaYSt);
		cairo_matrix_rotate(m_pMatrix, m_dAngleRad);
		//cairo_matrix_translate(m_pMatrix, -dWorldDeltaXSt, dWorldDeltaYSt);
	//}
	//else
	cairo_matrix_translate(m_pMatrix, -dWorldDeltaXSt, dWorldDeltaYSt);

	cairo_matrix_scale(m_pMatrix, m_dScale, -m_dScale);

	//init matrix for Wld2DC & DC2Wld
	cairo_matrix_init_translate (m_pDisplayMatrix, m_dFrameCenterX, m_dFrameCenterY);
	if(!IsDoubleEquil(m_dAngleRad, 0.0))
		cairo_matrix_rotate(m_pDisplayMatrix, m_dAngleRad);
	cairo_matrix_translate(m_pDisplayMatrix, -dWorldDeltaXSt, dWorldDeltaYSt);
	cairo_matrix_scale(m_pDisplayMatrix, m_dScale, -m_dScale);

	//init matrix for TransformRect
	cairo_matrix_init_translate (m_pDisplayMatrixNoRotate, m_dFrameCenterX, m_dFrameCenterY);
	cairo_matrix_translate(m_pDisplayMatrixNoRotate, -dWorldDeltaXSt, dWorldDeltaYSt);
	cairo_matrix_scale(m_pDisplayMatrixNoRotate, m_dScale, -m_dScale);

	//set matrix to all caches
	for(size_t i = 0; i < m_saLayerCaches.size(); ++i)
		cairo_set_matrix (m_saLayerCaches[i].pCairoContext, m_pMatrix);
}

void
draw_gdk_apply_netstate_transformation  (cairo_matrix_t *fullMatrix, cairo_matrix_t *scaleMatrix,
	gerbv_netstate_t *state) {
	/* apply scale factor */
	cairo_matrix_scale (fullMatrix, state->scaleA, state->scaleB);
	cairo_matrix_scale (scaleMatrix, state->scaleA, state->scaleB);
	/* apply offset */
	cairo_matrix_translate (fullMatrix, state->offsetA, state->offsetB);
	/* apply mirror */
	switch (state->mirrorState) {
		case GERBV_MIRROR_STATE_FLIPA:
			cairo_matrix_scale (fullMatrix, -1, 1);
			cairo_matrix_scale (scaleMatrix, -1, 1);
			break;
		case GERBV_MIRROR_STATE_FLIPB:
			cairo_matrix_scale (fullMatrix, 1, -1);
			cairo_matrix_scale (scaleMatrix, -1, 1);
			break;
		case GERBV_MIRROR_STATE_FLIPAB:
			cairo_matrix_scale (fullMatrix, -1, -1);
			cairo_matrix_scale (scaleMatrix, -1, 1);
			break;
		default:
			break;
	}
	/* finally, apply axis select */
	if (state->axisSelect == GERBV_AXIS_SELECT_SWAPAB) {
		/* we do this by rotating 270 (counterclockwise, then mirroring
		   the Y axis */
		cairo_matrix_rotate (fullMatrix, 3 * M_PI / 2);
		cairo_matrix_scale (fullMatrix, 1, -1);
	}
}

void
_cairo_draw_film_foreground (cairo_t *cr,
			     int      x,
			     int      y,
			     int      width,
			     int      height,
			     int      thumbnail_size)
{
	cairo_pattern_t *pattern;
	double           film_scale;
	cairo_matrix_t   matrix;
	double           film_strip;

	/* left film strip */

	pattern = _cairo_film_pattern_create ();

	if (thumbnail_size > 128)
		film_scale = 256.0 / thumbnail_size;
	else
		film_scale = 128.0 / thumbnail_size;
	film_strip = 9.0 / film_scale;

	cairo_matrix_init_identity (&matrix);
	cairo_matrix_scale (&matrix, film_scale, film_scale);
	cairo_matrix_translate (&matrix, -x, 0);
	cairo_pattern_set_matrix (pattern, &matrix);
	cairo_set_source (cr, pattern);
	cairo_rectangle (cr,
			 x,
			 y,
			 film_strip,
			 height);
	cairo_fill (cr);

	/* right film strip */

	x = x + width - film_strip;
	cairo_matrix_init_identity (&matrix);
	cairo_matrix_scale (&matrix, film_scale, film_scale);
	cairo_matrix_translate (&matrix, -x, 0);
	cairo_pattern_set_matrix (pattern, &matrix);
	cairo_set_source (cr, pattern);
	cairo_rectangle (cr,
			 x,
			 y,
			 film_strip,
			 height);
	cairo_fill (cr);

	cairo_pattern_destroy (pattern);
}

static cairo_test_status_t
source (cairo_t *cr, int width, int height)
{
    cairo_pattern_t *pattern;
    cairo_matrix_t   mat;

    cairo_translate (cr, PAD, PAD);

    pattern = create_pattern (cr);

    cairo_matrix_init_identity (&mat);
    cairo_matrix_scale (&mat, 2, 1.5);
    cairo_matrix_rotate (&mat, 1);
    cairo_matrix_translate (&mat, -PAT_WIDTH/4.0, -PAT_WIDTH/2.0);
    cairo_pattern_set_matrix (pattern, &mat);
    cairo_pattern_set_extend (pattern, CAIRO_EXTEND_NONE);

    cairo_set_source (cr, pattern);
    cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
    cairo_paint (cr);

    cairo_pattern_destroy (pattern);

    return CAIRO_TEST_SUCCESS;
}

static cairo_status_t
_cairo_type3_glyph_surface_emit_image_pattern (cairo_type3_glyph_surface_t *surface,
					       cairo_image_surface_t       *image,
					       cairo_matrix_t              *pattern_matrix)
{
    cairo_matrix_t mat, upside_down;
    cairo_status_t status;

    if (image->width == 0 || image->height == 0)
	return CAIRO_STATUS_SUCCESS;

    mat = *pattern_matrix;

    /* Get the pattern space to user space matrix  */
    status = cairo_matrix_invert (&mat);

    /* cairo_pattern_set_matrix ensures the matrix is invertible */
    assert (status == CAIRO_STATUS_SUCCESS);

    /* Make this a pattern space to Type 3 font space matrix */
    cairo_matrix_multiply (&mat, &mat, &surface->cairo_to_pdf);

    /* PDF images are in a 1 unit by 1 unit image space. Turn the 1 by
     * 1 image upside down to convert to flip the Y-axis going from
     * cairo to PDF. Then scale the image up to the required size. */
    cairo_matrix_scale (&mat, image->width, image->height);
    cairo_matrix_init (&upside_down, 1, 0, 0, -1, 0, 1);
    cairo_matrix_multiply (&mat, &upside_down, &mat);

    return _cairo_type3_glyph_surface_emit_image (surface, image, &mat);
}

static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
    cairo_font_face_t *font_face;
    cairo_font_options_t *font_options;
    cairo_scaled_font_t *scaled_font;
    cairo_matrix_t identity;
    cairo_matrix_t zero;

    cairo_matrix_init_identity(&identity);

    zero = identity;
    cairo_matrix_scale(&zero, 0, 0);

    font_face = cairo_get_font_face (cr);
    font_options = cairo_font_options_create ();
    cairo_get_font_options (cr, font_options);
    scaled_font = cairo_scaled_font_create (font_face,
	    &identity,
	    &zero,
	    font_options);
    cairo_set_scaled_font (cr, scaled_font);
    cairo_show_text (cr, "Hello");
    cairo_scaled_font_destroy (scaled_font);
    cairo_font_options_destroy (font_options);

    return cairo_test_status_from_status (cairo_test_get_context (cr),
                                          cairo_status(cr));
}

static SeedValue
seed_cairo_matrix_scale (SeedContext ctx,
				  SeedObject function,
				  SeedObject this_object,
				  gsize argument_count,
				  const SeedValue arguments[],
				  SeedException *exception)
{
  gdouble x, y;
  cairo_matrix_t m;

  if (argument_count != 3)
    {
      EXPECTED_EXCEPTION("scale", "3 arguments");
    }

  if (!seed_value_to_cairo_matrix (ctx, arguments[0], &m, exception))
    {
      seed_make_exception (ctx, exception, "ArgumentError", "scale needs an array [xx, yx, xy, yy, x0, y0]");
    }
  x = seed_value_to_double (ctx, arguments[1], exception);
  y = seed_value_to_double (ctx, arguments[2], exception);

  cairo_matrix_scale (&m, x, y);

  return seed_value_from_cairo_matrix (ctx, &m, exception);
}

/**
 * adg_gtk_area_reset:
 * @area: an #AdgGtkArea
 *
 * Forcibly resets the zoom ratio and position of the canvas bound
 * to @area. This means the canvas will be scaled and centered on
 * the current available space.
 **/
void
adg_gtk_area_reset(AdgGtkArea *area)
{
    AdgGtkAreaPrivate *data;
    GtkWidget *parent;
    const CpmlExtents *sheet;
    GtkAllocation allocation;
    CpmlPair size;
    gdouble zoom;

    g_return_if_fail(ADG_GTK_IS_AREA(area));

    data = adg_gtk_area_get_instance_private(area);
    cairo_matrix_init_identity(&data->render_map);

    sheet = _adg_get_extents(area);
    if (!sheet->is_defined || sheet->size.x <= 0 || sheet->size.y <= 0)
        return;

    parent = gtk_widget_get_parent((GtkWidget *) area);
    gtk_widget_get_allocation(parent, &allocation);
    size.x = allocation.width;
    size.y = allocation.height;
    zoom = MIN(size.x / sheet->size.x, size.y / sheet->size.y);

    cairo_matrix_scale(&data->render_map, zoom, zoom);
    cairo_matrix_translate(&data->render_map,
                           (size.x / zoom - sheet->size.x) / 2 - sheet->org.x,
                           (size.y / zoom - sheet->size.y) / 2 - sheet->org.y);

    /* Trigger a resize trying to hide the scrollbars on the parent */
    gtk_widget_queue_resize(parent);
}

JNIEXPORT void JNICALL
Java_org_freedesktop_cairo_CairoMatrix_cairo_1matrix_1scale
(
	JNIEnv* env,
	jclass cls,
	jlong _self,
	jdouble _sx,
	jdouble _sy
)
{
	cairo_matrix_t* self;
	double sx;
	double sy;

	// convert parameter self
	self = (cairo_matrix_t*) _self;

	// convert parameter sx
	sx = (double) _sx;

	// convert parameter sy
	sy = (double) _sy;

	// call function
	cairo_matrix_scale(self, sx, sy);

	// cleanup parameter self

	// cleanup parameter sx

	// cleanup parameter sy
}

static int
cairmat_scale (lua_State *L) {
    cairo_matrix_t mat;
    from_lua_matrix(L, &mat, 1);
    cairo_matrix_scale(&mat, luaL_checknumber(L, 2), luaL_checknumber(L, 3));
    to_lua_matrix(L, &mat, 1);
    return 0;
}

static int m_cairo_matrix_scale(lua_State * L)
{
	cairo_matrix_t * matrix = luaL_checkudata(L, 1, MT_NAME_CAIRO_MATRIX);
	double sx = luaL_checknumber(L, 2);
	double sy = luaL_checknumber(L, 3);
	cairo_matrix_scale(matrix, sx, sy);
	return 0;
}

void ofCairoRenderer::scale(float xAmnt, float yAmnt, float zAmnt ){
	if(!surface || !cr) return;
	cairo_matrix_scale(getCairoMatrix(),xAmnt,yAmnt);
	setCairoMatrix();

	if(!b3D) return;
	modelView.glScale(xAmnt,yAmnt,zAmnt);
}

static cairo_status_t
_cairo_skia_context_scale (void *abstract_cr,
			   double sx,
			      double sy)
{
    cairo_skia_context_t *cr = (cairo_skia_context_t *) abstract_cr;

    cairo_matrix_scale (&cr->matrix, sx, sy);
    return CAIRO_STATUS_SUCCESS;
}