1 files changed, 300 insertions, 0 deletions
diff --git a/src/engine/drawer.cpp b/src/engine/drawer.cpp
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+++ b/src/engine/drawer.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtDataVis3D module.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qdatavis3namespace.h"
+#include "drawer_p.h"
+#include "shaderhelper_p.h"
+#include "objecthelper_p.h"
+#include "camerahelper_p.h"
+#include "qdataitem.h"
+#include "qdataitem_p.h"
+#include "utils_p.h"
+#include "texturehelper_p.h"
+#include <QMatrix4x4>
+#include <qmath.h>
+
+QTCOMMERCIALDATAVIS3D_BEGIN_NAMESPACE
+
+Drawer::Drawer(const Theme &theme, const QFont &font, LabelTransparency transparency)
+    : m_theme(theme),
+      m_font(font),
+      m_transparency(transparency),
+      m_textureHelper(new TextureHelper())
+{
+    initializeOpenGLFunctions();
+}
+
+Drawer::~Drawer()
+{
+
+}
+
+void Drawer::setTheme(const Theme &theme)
+{
+    m_theme = theme;
+    emit drawerChanged();
+}
+
+void Drawer::setFont(const QFont &font)
+{
+    m_font = font;
+    emit drawerChanged();
+}
+
+void Drawer::setTransparency(LabelTransparency transparency)
+{
+    m_transparency = transparency;
+    emit drawerChanged();
+}
+
+void Drawer::drawObject(ShaderHelper *shader, ObjectHelper *object, GLuint textureId,
+                        GLuint depthTextureId)
+{
+    if (textureId) {
+        // Activate texture
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, textureId);
+        shader->setUniformValue(shader->texture(), 0);
+    }
+
+    if (depthTextureId) {
+        // Activate depth texture
+        glActiveTexture(GL_TEXTURE1);
+        glBindTexture(GL_TEXTURE_2D, depthTextureId);
+        shader->setUniformValue(shader->shadow(), 1);
+    }
+
+    // 1st attribute buffer : vertices
+    glEnableVertexAttribArray(shader->posAtt());
+    glBindBuffer(GL_ARRAY_BUFFER, object->vertexBuf());
+    glVertexAttribPointer(shader->posAtt(), 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
+
+    // 2nd attribute buffer : normals
+    glEnableVertexAttribArray(shader->normalAtt());
+    glBindBuffer(GL_ARRAY_BUFFER, object->normalBuf());
+    glVertexAttribPointer(shader->normalAtt(), 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
+
+    if (textureId || depthTextureId) {
+        // 3rd attribute buffer : UVs
+        glEnableVertexAttribArray(shader->uvAtt());
+        glBindBuffer(GL_ARRAY_BUFFER, object->uvBuf());
+        glVertexAttribPointer(shader->uvAtt(), 2, GL_FLOAT, GL_FALSE, 0, (void*)0);
+    }
+
+    // Index buffer
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, object->elementBuf());
+
+    // Draw the triangles
+    glDrawElements(GL_TRIANGLES, object->indexCount(), GL_UNSIGNED_SHORT, (void*)0);
+
+    // Free buffers
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+
+    if (textureId || depthTextureId) {
+        glBindTexture(GL_TEXTURE_2D, 0);
+        glDisableVertexAttribArray(shader->uvAtt());
+    }
+    glDisableVertexAttribArray(shader->normalAtt());
+    glDisableVertexAttribArray(shader->posAtt());
+}
+
+void Drawer::drawLabel(const QDataItem &item, const LabelItem &label,
+                       const QMatrix4x4 &viewmatrix, const QMatrix4x4 &projectionmatrix,
+                       const QVector3D &positionComp, const QVector3D &rotation,
+                       GLfloat maxHeight, SelectionMode mode,
+                       ShaderHelper *shader, ObjectHelper *object, bool useDepth, bool rotateAlong,
+                       LabelPosition position, Qt::AlignmentFlag alignment)
+{
+    // Draw label
+    LabelItem labelItem = label;
+    if (!labelItem.textureId())
+        return; // No texture, skip
+
+    QSize textureSize = labelItem.size();
+    QMatrix4x4 modelMatrix;
+    QMatrix4x4 MVPMatrix;
+    GLfloat xPosition;
+    GLfloat yPosition;
+    GLfloat zPosition = positionComp.z();
+
+    switch (position) {
+    case LabelBelow: {
+        yPosition = -1.6f; // minus maximum negative height (+ some extra for label)
+        break;
+    }
+    case LabelLow: {
+        yPosition = -positionComp.y();
+        break;
+    }
+    case LabelMid: {
+        // Use this for positioning with absolute item y position value
+        yPosition = item.d_ptr->translation().y();
+        break;
+    }
+    case LabelHigh: {
+        // TODO: Fix this. Can't seem to get it right (if ok with positive-only bars, doesn't look good on +- and vice versa)
+        yPosition = item.d_ptr->translation().y() + (item.d_ptr->value() / maxHeight) / 2.0f;
+        break;
+    }
+    case LabelOver: {
+        float mod = 0.1f;
+        if (item.d_ptr->value() < 0)
+            mod = -0.1f;
+        yPosition = item.d_ptr->translation().y() - (positionComp.y() / 2.0f - 0.2f)
+                + (item.d_ptr->value() / maxHeight) + mod;
+        break;
+    }
+    case LabelBottom: {
+        yPosition = -1.95f; // TODO: Calculate from scene
+        xPosition = 0.0f;
+        break;
+    }
+    case LabelTop: {
+        yPosition = 1.95f; // TODO: Calculate from scene
+        xPosition = 0.0f;
+        break;
+    }
+    case LabelLeft: {
+        yPosition = 0.0f;
+        xPosition = -2.5f; // TODO: Calculate from scene
+        break;
+    }
+    case LabelRight: {
+        yPosition = 0.0f;
+        xPosition = 2.5f; // TODO: Calculate from scene
+        break;
+    }
+    }
+
+    // Calculate scale factor to get uniform font size
+    GLfloat scaledFontSize = 0.05f + m_font.pointSizeF() / 500.0f;
+    GLfloat scaleFactor = scaledFontSize / (GLfloat)textureSize.height();
+
+    // Apply alignment
+    GLfloat xAlignment = 0.0f;
+    GLfloat zAlignment = 0.0f;
+    switch (alignment) {
+    case Qt::AlignLeft: {
+        xAlignment = (-(GLfloat)textureSize.width() * scaleFactor)
+                * qFabs(cos(rotation.y() * m_pi / 180.0f));
+        zAlignment = ((GLfloat)textureSize.width() * scaleFactor)
+                * qFabs(sin(rotation.y() * m_pi / 180.0f));
+        break;
+    }
+    case Qt::AlignRight: {
+        xAlignment = ((GLfloat)textureSize.width() * scaleFactor)
+                * qFabs(cos(rotation.y() * m_pi / 180.0f));
+        zAlignment = (-(GLfloat)textureSize.width() * scaleFactor)
+                * qFabs(sin(rotation.y() * m_pi / 180.0f));
+        break;
+    }
+    default: {
+        break;
+    }
+    }
+
+    if (position < LabelBottom) {
+        xPosition = item.d_ptr->translation().x();
+        if (useDepth)
+            zPosition = item.d_ptr->translation().z();
+        else if (ModeZoomColumn == mode)
+            xPosition = -(item.d_ptr->translation().z()) + positionComp.z(); // flip first to left
+    }
+
+    // Position label
+    modelMatrix.translate(xPosition + xAlignment, yPosition, zPosition + zAlignment);
+
+    // Rotate
+    modelMatrix.rotate(rotation.z(), 0.0f, 0.0f, 1.0f);
+    modelMatrix.rotate(rotation.y(), 0.0f, 1.0f, 0.0f);
+    modelMatrix.rotate(rotation.x(), 1.0f, 0.0f, 0.0f);
+
+    if (useDepth && !rotateAlong) {
+        // Apply negative camera rotations to keep labels facing camera
+        QPointF camRotations = CameraHelper::getCameraRotations();
+        modelMatrix.rotate(-camRotations.x(), 0.0f, 1.0f, 0.0f);
+        modelMatrix.rotate(-camRotations.y(), 1.0f, 0.0f, 0.0f);
+    }
+
+    // Scale label based on text size
+    modelMatrix.scale(QVector3D((GLfloat)textureSize.width() * scaleFactor,
+                                scaledFontSize,
+                                0.0f));
+
+    MVPMatrix = projectionmatrix * viewmatrix * modelMatrix;
+
+    // Set shader bindings
+    shader->setUniformValue(shader->MVP(), MVPMatrix);
+
+    // Draw the object
+    drawObject(shader, object, labelItem.textureId());
+}
+
+void Drawer::generateLabelTexture(QDataItem *item)
+{
+    LabelItem labelItem = item->d_ptr->label();
+    generateLabelItem(&labelItem, item->d_ptr->valueStr());
+    item->d_ptr->setLabel(labelItem);
+}
+
+void Drawer::generateLabelItem(LabelItem *item, const QString &text)
+{
+    // Delete previous texture, if there is one
+    GLuint labelTexture = item->textureId();
+    if (labelTexture)
+        glDeleteTextures(1, &labelTexture);
+
+    // Create labels
+    // Print label into a QImage using QPainter
+    QImage label = Utils::printTextToImage(m_font,
+                                           text,
+                                           m_theme.m_textBackgroundColor,
+                                           m_theme.m_textColor,
+                                           m_transparency);
+
+    // Set label size
+    item->setSize(label.size());
+    // Insert text texture into label
+    item->setTextureId(m_textureHelper->create2DTexture(label, true, true));
+}
+
+QTCOMMERCIALDATAVIS3D_END_NAMESPACE