mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 21:33:55 +00:00
97 lines
3.5 KiB
C++
97 lines
3.5 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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//
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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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#include <vtkm/rendering/TextAnnotationBillboard.h>
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#include <vtkm/Matrix.h>
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namespace vtkm
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{
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namespace rendering
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{
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TextAnnotationBillboard::TextAnnotationBillboard(const std::string& text,
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const vtkm::rendering::Color& color,
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vtkm::Float32 scalar,
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const vtkm::Vec3f_32& position,
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vtkm::Float32 angleDegrees)
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: TextAnnotation(text, color, scalar)
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, Position(position)
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, Angle(angleDegrees)
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{
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}
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TextAnnotationBillboard::~TextAnnotationBillboard() {}
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void TextAnnotationBillboard::SetPosition(const vtkm::Vec3f_32& position)
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{
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this->Position = position;
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}
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void TextAnnotationBillboard::SetPosition(vtkm::Float32 xpos,
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vtkm::Float32 ypos,
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vtkm::Float32 zpos)
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{
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this->SetPosition(vtkm::make_Vec(xpos, ypos, zpos));
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}
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void TextAnnotationBillboard::Render(const vtkm::rendering::Camera& camera,
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const vtkm::rendering::WorldAnnotator& worldAnnotator,
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vtkm::rendering::Canvas& canvas) const
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{
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using MatrixType = vtkm::Matrix<vtkm::Float32, 4, 4>;
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using VectorType = vtkm::Vec3f_32;
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MatrixType viewMatrix = camera.CreateViewMatrix();
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MatrixType projectionMatrix =
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camera.CreateProjectionMatrix(canvas.GetWidth(), canvas.GetHeight());
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VectorType screenPos = vtkm::Transform3DPointPerspective(
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vtkm::MatrixMultiply(projectionMatrix, viewMatrix), this->Position);
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canvas.SetViewToScreenSpace(camera, true);
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MatrixType translateMatrix =
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vtkm::Transform3DTranslate(screenPos[0], screenPos[1], -screenPos[2]);
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vtkm::Float32 windowAspect = vtkm::Float32(canvas.GetWidth()) / vtkm::Float32(canvas.GetHeight());
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MatrixType scaleMatrix = vtkm::Transform3DScale(1.f / windowAspect, 1.f, 1.f);
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MatrixType viewportMatrix;
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vtkm::MatrixIdentity(viewportMatrix);
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//if view type == 2D?
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{
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vtkm::Float32 vl, vr, vb, vt;
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camera.GetRealViewport(canvas.GetWidth(), canvas.GetHeight(), vl, vr, vb, vt);
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vtkm::Float32 xs = (vr - vl);
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vtkm::Float32 ys = (vt - vb);
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viewportMatrix = vtkm::Transform3DScale(2.f / xs, 2.f / ys, 1.f);
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}
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MatrixType rotateMatrix = vtkm::Transform3DRotateZ(this->Angle * vtkm::Pi_180f());
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vtkm::Matrix<vtkm::Float32, 4, 4> fullTransformMatrix = vtkm::MatrixMultiply(
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translateMatrix,
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vtkm::MatrixMultiply(scaleMatrix, vtkm::MatrixMultiply(viewportMatrix, rotateMatrix)));
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VectorType origin = vtkm::Transform3DPointPerspective(fullTransformMatrix, VectorType(0, 0, 0));
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VectorType right = vtkm::Transform3DVector(fullTransformMatrix, VectorType(1, 0, 0));
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VectorType up = vtkm::Transform3DVector(fullTransformMatrix, VectorType(0, 1, 0));
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// scale depth from (1, -1) to (0, 1);
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vtkm::Float32 depth = screenPos[2] * .5f + .5f;
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worldAnnotator.AddText(
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origin, right, up, this->Scale, this->Anchor, this->TextColor, this->Text, depth);
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canvas.SetViewToWorldSpace(camera, true);
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}
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}
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} // vtkm::rendering
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