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vtkColorLegend.cxx
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vtkColorLegend.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkColorLegend.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkColorLegend.h"
#include "vtkAxis.h"
#include "vtkBrush.h"
#include "vtkCallbackCommand.h"
#include "vtkContext2D.h"
#include "vtkContextScene.h"
#include "vtkFloatArray.h"
#include "vtkImageData.h"
#include "vtkObjectFactory.h"
#include "vtkPen.h"
#include "vtkPoints2D.h"
#include "vtkScalarsToColors.h"
#include "vtkSmartPointer.h"
#include "vtkTransform2D.h"
//------------------------------------------------------------------------------
vtkStandardNewMacro(vtkColorLegend);
//------------------------------------------------------------------------------
vtkColorLegend::vtkColorLegend()
{
this->Interpolate = true;
this->Axis = vtkSmartPointer<vtkAxis>::New();
this->Axis->SetPosition(vtkAxis::RIGHT);
this->AddItem(this->Axis);
this->SetInline(false);
this->SetHorizontalAlignment(vtkChartLegend::RIGHT);
this->SetVerticalAlignment(vtkChartLegend::BOTTOM);
this->Callback = vtkSmartPointer<vtkCallbackCommand>::New();
this->Callback->SetClientData(this);
this->Callback->SetCallback(vtkColorLegend::OnScalarsToColorsModified);
this->TransferFunction = nullptr;
this->Orientation = vtkColorLegend::VERTICAL;
this->Position.Set(0.0, 0.0, 0.0, 0.0);
this->CustomPositionSet = false;
this->DrawBorder = false;
}
//------------------------------------------------------------------------------
vtkColorLegend::~vtkColorLegend() = default;
//------------------------------------------------------------------------------
void vtkColorLegend::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Interpolate: " << this->Interpolate << endl;
}
//------------------------------------------------------------------------------
void vtkColorLegend::GetBounds(double bounds[4])
{
if (this->TransferFunction)
{
bounds[0] = this->TransferFunction->GetRange()[0];
bounds[1] = this->TransferFunction->GetRange()[1];
}
else
{
bounds[0] = 0.0;
bounds[1] = 1.0;
}
bounds[2] = 0.0;
bounds[3] = 1.0;
}
//------------------------------------------------------------------------------
void vtkColorLegend::Update()
{
if (this->ImageData == nullptr || this->ImageData->GetMTime() < this->GetMTime())
{
this->ComputeTexture();
}
// check if the range of our TransferFunction changed
double bounds[4];
this->GetBounds(bounds);
if (bounds[0] == bounds[1])
{
vtkWarningMacro(<< "The color transfer function seems to be empty.");
this->Axis->Update();
return;
}
double axisBounds[2];
this->Axis->GetUnscaledRange(axisBounds);
if (bounds[0] != axisBounds[0] || bounds[1] != axisBounds[1])
{
this->Axis->SetUnscaledRange(bounds[0], bounds[1]);
}
this->Axis->Update();
}
//------------------------------------------------------------------------------
bool vtkColorLegend::Paint(vtkContext2D* painter)
{
if (this->TransferFunction == nullptr)
{
return true;
}
this->GetBoundingRect(painter);
if (this->DrawBorder)
{
// Draw a box around the legend.
painter->ApplyPen(this->Pen);
painter->ApplyBrush(this->Brush);
painter->DrawRect(
this->Rect.GetX(), this->Rect.GetY(), this->Rect.GetWidth(), this->Rect.GetHeight());
}
painter->DrawImage(this->Position, this->ImageData);
this->Axis->Paint(painter);
return true;
}
//------------------------------------------------------------------------------
void vtkColorLegend::SetTransferFunction(vtkScalarsToColors* transfer)
{
this->TransferFunction = transfer;
}
//------------------------------------------------------------------------------
vtkScalarsToColors* vtkColorLegend::GetTransferFunction()
{
return this->TransferFunction;
}
//------------------------------------------------------------------------------
void vtkColorLegend::SetPoint(float x, float y)
{
this->Superclass::SetPoint(x, y);
this->CustomPositionSet = false;
}
//------------------------------------------------------------------------------
void vtkColorLegend::SetTextureSize(float w, float h)
{
this->Position.SetWidth(w);
this->Position.SetHeight(h);
this->CustomPositionSet = false;
this->Modified();
}
//------------------------------------------------------------------------------
void vtkColorLegend::SetPosition(const vtkRectf& pos)
{
this->Position = pos;
this->SetPoint(pos[0], pos[1]);
this->UpdateAxisPosition();
this->CustomPositionSet = true;
}
//------------------------------------------------------------------------------
vtkRectf vtkColorLegend::GetPosition()
{
return this->Position;
}
//------------------------------------------------------------------------------
vtkRectf vtkColorLegend::GetBoundingRect(vtkContext2D* painter)
{
if (this->CacheBounds && this->RectTime > this->GetMTime() && this->RectTime > this->PlotTime &&
this->RectTime > this->Axis->GetMTime())
{
return this->Rect;
}
if (!this->CustomPositionSet)
{
// if the Position ivar was not explicitly set, we compute the
// location of the lower left point of the legend here.
float posX = floor(this->Point[0]);
float posY = floor(this->Point[1]);
float posW = this->Position.GetWidth();
float posH = this->Position.GetHeight();
if (this->Orientation == vtkColorLegend::VERTICAL)
{
// For vertical orientation, we need to move our anchor point
// further to the left to accommodate the width of the axis.
// To do this, we query our axis to get its preliminary bounds.
// Even though its position has not yet been set, its width &
// height should still be accurate.
this->UpdateAxisPosition();
this->Axis->Update();
vtkRectf axisRect = this->Axis->GetBoundingRect(painter);
posX -= axisRect.GetWidth();
}
// Compute bottom left point based on current alignment.
if (this->HorizontalAlignment == vtkChartLegend::CENTER)
{
posX -= posW / 2.0;
}
else if (this->HorizontalAlignment == vtkChartLegend::RIGHT)
{
posX -= posW;
}
if (this->VerticalAlignment == vtkChartLegend::CENTER)
{
posY -= posH / 2.0;
}
else if (this->VerticalAlignment == vtkChartLegend::TOP)
{
posY -= posH;
}
this->Position.SetX(posX);
this->Position.SetY(posY);
this->UpdateAxisPosition();
}
this->Axis->Update();
vtkRectf axisRect = this->Axis->GetBoundingRect(painter);
if (this->Orientation == vtkColorLegend::HORIZONTAL)
{
// "+ 1" so the texture doesn't obscure the border
this->Rect = vtkRectf(this->Position.GetX(), this->Position.GetY() - axisRect.GetHeight() + 1,
this->Position.GetWidth() + 1, this->Position.GetHeight() + axisRect.GetHeight());
}
else
{
this->Rect = vtkRectf(this->Position.GetX(), this->Position.GetY(),
this->Position.GetWidth() + axisRect.GetWidth(), this->Position.GetHeight());
}
this->RectTime.Modified();
return this->Rect;
}
//------------------------------------------------------------------------------
void vtkColorLegend::ComputeTexture()
{
if (this->TransferFunction == nullptr)
{
return;
}
if (!this->ImageData)
{
this->ImageData = vtkSmartPointer<vtkImageData>::New();
}
double bounds[4];
this->GetBounds(bounds);
if (bounds[0] == bounds[1])
{
vtkWarningMacro(<< "The color transfer function seems to be empty.");
return;
}
// Set the axis up
this->Axis->SetUnscaledRange(bounds[0], bounds[1]);
// this->Axis->AutoScale();
// Could depend on the screen resolution
const int dimension = 256;
double* values = new double[dimension];
// Texture 1D
if (this->Orientation == vtkColorLegend::VERTICAL)
{
this->ImageData->SetExtent(0, 0, 0, dimension - 1, 0, 0);
}
else
{
this->ImageData->SetExtent(0, dimension - 1, 0, 0, 0, 0);
}
this->ImageData->AllocateScalars(VTK_UNSIGNED_CHAR, 4);
for (int i = 0; i < dimension; ++i)
{
values[i] = bounds[0] + i * (bounds[1] - bounds[0]) / (dimension - 1);
}
unsigned char* ptr = reinterpret_cast<unsigned char*>(this->ImageData->GetScalarPointer());
this->TransferFunction->MapScalarsThroughTable2(values, ptr, VTK_DOUBLE, dimension, 1, 4);
delete[] values;
}
//------------------------------------------------------------------------------
void vtkColorLegend::OnScalarsToColorsModified(
vtkObject* caller, unsigned long eid, void* clientdata, void* calldata)
{
vtkColorLegend* self = reinterpret_cast<vtkColorLegend*>(clientdata);
self->ScalarsToColorsModified(caller, eid, calldata);
}
//------------------------------------------------------------------------------
void vtkColorLegend::ScalarsToColorsModified(
vtkObject* vtkNotUsed(object), unsigned long vtkNotUsed(eid), void* vtkNotUsed(calldata))
{
this->Modified();
}
//------------------------------------------------------------------------------
void vtkColorLegend::SetOrientation(int orientation)
{
if (orientation < 0 || orientation > 1)
{
vtkErrorMacro("Error, invalid orientation value supplied: " << orientation);
return;
}
this->Orientation = orientation;
if (this->Orientation == vtkColorLegend::HORIZONTAL)
{
this->Axis->SetPosition(vtkAxis::BOTTOM);
}
}
//------------------------------------------------------------------------------
void vtkColorLegend::SetTitle(const vtkStdString& title)
{
this->Axis->SetTitle(title);
}
//------------------------------------------------------------------------------
vtkStdString vtkColorLegend::GetTitle()
{
return this->Axis->GetTitle();
}
//------------------------------------------------------------------------------
void vtkColorLegend::UpdateAxisPosition()
{
if (this->Orientation == vtkColorLegend::VERTICAL)
{
this->Axis->SetPoint1(
vtkVector2f(this->Position.GetX() + this->Position.GetWidth(), this->Position.GetY()));
this->Axis->SetPoint2(vtkVector2f(this->Position.GetX() + this->Position.GetWidth(),
this->Position.GetY() + this->Position.GetHeight()));
}
else
{
this->Axis->SetPoint1(vtkVector2f(this->Position.GetX(), this->Position.GetY()));
this->Axis->SetPoint2(
vtkVector2f(this->Position.GetX() + this->Position.GetWidth(), this->Position.GetY()));
}
}
//------------------------------------------------------------------------------
bool vtkColorLegend::MouseMoveEvent(const vtkContextMouseEvent& mouse)
{
bool retval = this->Superclass::MouseMoveEvent(mouse);
this->Position[0] = this->Point[0];
this->Position[1] = this->Point[1];
this->UpdateAxisPosition();
return retval;
}