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96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkStringToImage.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkStringToImage
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* @brief base class for classes that render supplied text
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* to an image.
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*
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*
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*
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*/
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#ifndef vtkStringToImage_h
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#define vtkStringToImage_h
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#include "vtkObject.h"
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#include "vtkRenderingCoreModule.h" // For export macro
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class vtkStdString;
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class vtkUnicodeString;
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class vtkTextProperty;
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class vtkImageData;
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class vtkVector2i;
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class VTKRENDERINGCORE_EXPORT vtkStringToImage : public vtkObject
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{
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public:
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vtkTypeMacro(vtkStringToImage, vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@{
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/**
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* Given a text property and a string, get the bounding box [xmin, xmax] x
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* [ymin, ymax]. Note that this is the bounding box of the area
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* where actual pixels will be written, given a text/pen/baseline location
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* of (0,0).
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* For example, if the string starts with a 'space', or depending on the
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* orientation, you can end up with a [-20, -10] x [5, 10] bbox (the math
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* to get the real bbox is straightforward).
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* Return 1 on success, 0 otherwise.
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* You can use IsBoundingBoxValid() to test if the computed bbox
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* is valid (it may not if GetBoundingBox() failed or if the string
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* was empty).
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*/
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virtual vtkVector2i GetBounds(
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vtkTextProperty* property, const vtkUnicodeString& string, int dpi) = 0;
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virtual vtkVector2i GetBounds(vtkTextProperty* property, const vtkStdString& string, int dpi) = 0;
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//@}
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//@{
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/**
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* Given a text property and a string, this function initializes the
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* vtkImageData *data and renders it in a vtkImageData. textDims, if provided,
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* will be overwritten by the pixel width and height of the rendered string.
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* This is useful when ScaleToPowerOfTwo is true, and the image dimensions may
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* not match the dimensions of the rendered text.
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*/
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virtual int RenderString(vtkTextProperty* property, const vtkUnicodeString& string, int dpi,
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vtkImageData* data, int textDims[2] = nullptr) = 0;
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virtual int RenderString(vtkTextProperty* property, const vtkStdString& string, int dpi,
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vtkImageData* data, int text_dims[2] = nullptr) = 0;
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//@}
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/**
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* Should we produce images at powers of 2, makes rendering on old OpenGL
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* hardware easier. Default is false.
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*/
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virtual void SetScaleToPowerOfTwo(bool scale);
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vtkGetMacro(ScaleToPowerOfTwo, bool);
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protected:
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vtkStringToImage();
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~vtkStringToImage() override;
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bool Antialias;
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bool ScaleToPowerOfTwo;
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private:
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vtkStringToImage(const vtkStringToImage&) = delete;
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void operator=(const vtkStringToImage&) = delete;
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};
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#endif // vtkStringToImage_h
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