fa3e43fbaa
The word surface is more often used for something like a polygonal mesh, so this name is quite confusing. Canvas is consistent with a conventional name in GUI widget APIs.
309 lines
8.8 KiB
C++
309 lines
8.8 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt 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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// Copyright 2015 Sandia Corporation.
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_rendering_CanvasGL_h
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#define vtk_m_rendering_CanvasGL_h
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#include <vtkm/Types.h>
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#include <vtkm/rendering/Camera.h>
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#include <vtkm/rendering/Canvas.h>
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#include <vtkm/rendering/Color.h>
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#include <vtkm/rendering/BitmapFont.h>
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#include <vtkm/rendering/BitmapFontFactory.h>
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#include <vtkm/rendering/TextureGL.h>
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#include <vtkm/rendering/MatrixHelpers.h>
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#include <vtkm/rendering/internal/OpenGLHeaders.h>
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#include <iostream>
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#include <fstream>
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namespace vtkm {
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namespace rendering {
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class CanvasGL : public Canvas
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{
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public:
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VTKM_CONT_EXPORT
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CanvasGL(std::size_t w=1024,
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std::size_t h=1024,
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const vtkm::rendering::Color &c =
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vtkm::rendering::Color(0.0f,0.0f,0.0f,1.0f))
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: Canvas(w,h,c)
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{
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}
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VTKM_CONT_EXPORT
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virtual void Clear()
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{
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glClearColor(this->BackgroundColor.Components[0],
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this->BackgroundColor.Components[1],
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this->BackgroundColor.Components[2],
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1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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}
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VTKM_CONT_EXPORT
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virtual void Finish()
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{
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glFinish();
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}
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VTKM_CONT_EXPORT
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virtual void SetViewToWorldSpace(vtkm::rendering::Camera &camera, bool clip)
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{
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vtkm::Float32 oglP[16], oglM[16];
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MatrixHelpers::CreateOGLMatrix(camera.CreateProjectionMatrix(), oglP);
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glMatrixMode(GL_PROJECTION);
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glLoadMatrixf(oglP);
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MatrixHelpers::CreateOGLMatrix(camera.CreateViewMatrix(), oglM);
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glMatrixMode(GL_MODELVIEW);
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glLoadMatrixf(oglM);
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SetViewportClipping(camera, clip);
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}
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VTKM_CONT_EXPORT
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virtual void SetViewToScreenSpace(vtkm::rendering::Camera &camera, bool clip)
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{
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vtkm::Float32 oglP[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
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vtkm::Float32 oglM[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
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oglP[0*4+0] = 1.;
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oglP[1*4+1] = 1.;
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oglP[2*4+2] = -1.;
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oglP[3*4+3] = 1.;
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glMatrixMode(GL_PROJECTION);
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glLoadMatrixf(oglP);
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oglM[0*4+0] = 1.;
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oglM[1*4+1] = 1.;
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oglM[2*4+2] = 1.;
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oglM[3*4+3] = 1.;
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glMatrixMode(GL_MODELVIEW);
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glLoadMatrixf(oglM);
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SetViewportClipping(camera, clip);
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}
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VTKM_CONT_EXPORT
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virtual void SetViewportClipping(vtkm::rendering::Camera &camera, bool clip)
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{
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if (clip)
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{
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vtkm::Float32 vl, vr, vb, vt;
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camera.GetRealViewport(vl,vr,vb,vt);
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vtkm::Float32 _x = static_cast<vtkm::Float32>(camera.Width)*(1.f+vl)/2.f;
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vtkm::Float32 _y = static_cast<vtkm::Float32>(camera.Height)*(1.f+vb)/2.f;
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vtkm::Float32 _w = static_cast<vtkm::Float32>(camera.Width)*(vr-vl)/2.f;
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vtkm::Float32 _h = static_cast<vtkm::Float32>(camera.Height)*(vt-vb)/2.f;
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glViewport(static_cast<int>(_x), static_cast<int>(_y),
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static_cast<int>(_w), static_cast<int>(_h));
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}
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else
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{
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glViewport(0,0, camera.Width, camera.Height);
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}
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}
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VTKM_CONT_EXPORT
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virtual void SaveAs(const std::string &fileName)
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{
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std::ofstream of(fileName.c_str());
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of << "P6" << std::endl
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<< this->Width << " " << this->Height <<std::endl
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<< 255 << std::endl;
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int height = static_cast<int>(this->Height);
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for (int yIndex=height-1; yIndex>=0; yIndex--)
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for (std::size_t xIndex=0; xIndex < this->Width; xIndex++)
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{
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const vtkm::Float32 *tuple =
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&(this->ColorBuffer[static_cast<std::size_t>(yIndex)*this->Width*4 + xIndex*4]);
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of<<(unsigned char)(tuple[0]*255);
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of<<(unsigned char)(tuple[1]*255);
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of<<(unsigned char)(tuple[2]*255);
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}
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of.close();
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}
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VTKM_CONT_EXPORT
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virtual void AddLine(vtkm::Float64 x0, vtkm::Float64 y0,
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vtkm::Float64 x1, vtkm::Float64 y1,
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vtkm::Float32 linewidth,
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const vtkm::rendering::Color &c)
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{
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_LIGHTING);
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glColor3fv(c.Components);
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glLineWidth(linewidth);
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glBegin(GL_LINES);
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glVertex2f(float(x0),float(y0));
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glVertex2f(float(x1),float(y1));
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glEnd();
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}
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VTKM_CONT_EXPORT
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virtual void AddColorBar(vtkm::Float32 x, vtkm::Float32 y,
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vtkm::Float32 w, vtkm::Float32 h,
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const vtkm::rendering::ColorTable &ct,
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bool horizontal)
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{
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const int n = 256;
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_LIGHTING);
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glBegin(GL_QUADS);
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for (int i=0; i<n; i++)
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{
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vtkm::Float32 v0 = static_cast<vtkm::Float32>(i)/static_cast<vtkm::Float32>(n);
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vtkm::Float32 v1 = static_cast<vtkm::Float32>(i+1)/static_cast<vtkm::Float32>(n);
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Color c0 = ct.MapRGB(v0);
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Color c1 = ct.MapRGB(v1);
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if (horizontal)
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{
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vtkm::Float32 x0 = x + w*v0;
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vtkm::Float32 x1 = x + w*v1;
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vtkm::Float32 y0 = y;
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vtkm::Float32 y1 = y + h;
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glColor3fv(c0.Components);
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glVertex2f(x0,y0);
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glVertex2f(x0,y1);
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glColor3fv(c1.Components);
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glVertex2f(x1,y1);
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glVertex2f(x1,y0);
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}
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else // vertical
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{
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vtkm::Float32 x0 = x;
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vtkm::Float32 x1 = x + w;
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vtkm::Float32 y0 = y + h*v0;
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vtkm::Float32 y1 = y + h*v1;
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glColor3fv(c0.Components);
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glVertex2f(x0,y1);
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glVertex2f(x1,y1);
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glColor3fv(c1.Components);
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glVertex2f(x1,y0);
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glVertex2f(x0,y0);
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}
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}
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glEnd();
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}
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VTKM_CONT_EXPORT
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virtual void AddText(vtkm::Float32 x, vtkm::Float32 y,
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vtkm::Float32 scale,
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vtkm::Float32 angle,
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vtkm::Float32 windowaspect,
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vtkm::Float32 anchorx, vtkm::Float32 anchory,
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Color color,
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std::string text)
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{
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glPushMatrix();
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glTranslatef(x,y,0);
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glScalef(1.f/windowaspect, 1, 1);
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glRotatef(angle, 0,0,1);
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glColor3fv(color.Components);
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RenderText(scale, anchorx, anchory, text);
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glPopMatrix();
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}
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private:
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BitmapFont Font;
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TextureGL FontTexture;
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void RenderText(vtkm::Float32 scale,
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vtkm::Float32 anchorx, vtkm::Float32 anchory,
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std::string text)
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{
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if (this->FontTexture.ID == 0)
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{
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Font = BitmapFontFactory::CreateLiberation2Sans();
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std::vector<unsigned char> &rawpngdata = this->Font.GetRawImageData();
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std::vector<unsigned char> rgba;
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unsigned long width, height;
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int error = decodePNG(rgba, width, height,
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&rawpngdata[0], rawpngdata.size());
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if (error != 0)
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{
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return;
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}
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this->FontTexture.CreateAlphaFromRGBA(int(width),int(height),rgba);
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}
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this->FontTexture.Enable();
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glDepthMask(GL_FALSE);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable(GL_BLEND);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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glDisable(GL_LIGHTING);
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//glTexEnvf(GL_TEXTURE_FILTER_CONTROL, GL_TEXTURE_LOD_BIAS, -.5);
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glBegin(GL_QUADS);
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vtkm::Float32 textwidth = this->Font.GetTextWidth(text);
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vtkm::Float32 fx = -(.5f + .5f*anchorx) * textwidth;
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vtkm::Float32 fy = -(.5f + .5f*anchory);
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vtkm::Float32 fz = 0;
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for (unsigned int i=0; i<text.length(); ++i)
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{
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char c = text[i];
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char nextchar = (i < text.length()-1) ? text[i+1] : 0;
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vtkm::Float32 vl,vr,vt,vb;
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vtkm::Float32 tl,tr,tt,tb;
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this->Font.GetCharPolygon(c, fx, fy,
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vl, vr, vt, vb,
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tl, tr, tt, tb, nextchar);
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glTexCoord2f(tl, 1.f-tt);
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glVertex3f(scale*vl, scale*vt, fz);
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glTexCoord2f(tl, 1.f-tb);
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glVertex3f(scale*vl, scale*vb, fz);
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glTexCoord2f(tr, 1.f-tb);
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glVertex3f(scale*vr, scale*vb, fz);
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glTexCoord2f(tr, 1.f-tt);
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glVertex3f(scale*vr, scale*vt, fz);
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}
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glEnd();
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this->FontTexture.Disable();
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//glTexEnvf(GL_TEXTURE_FILTER_CONTROL, GL_TEXTURE_LOD_BIAS, 0);
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glDepthMask(GL_TRUE);
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glDisable(GL_ALPHA_TEST);
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}
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};
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}} //namespace vtkm::rendering
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#endif //vtk_m_rendering_CanvasGL_h
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