void OpacityTransferFunctionWidget::RestoreControlPoints(int number,
float max,
float* scalar,
float* opacity) {
// Temporary control point
ControlPoint tmp;
// Set number of control points
_numberOfControlPoints = number;
// Set maximum scalar value
_scalarMaximum = max;
// Clear all control points
_controlPoint.clear();
// Set each control point from arrays
for (int i = 0 ; i < number ; i++) {
tmp.SetScalar(scalar[i]);
tmp.SetOpacity(opacity[i]);
_controlPoint.push_back(tmp);
}
// Set focus point
_focusPoint = -1;
return;
}
OpacityTransferFunctionWidget::OpacityTransferFunctionWidget(int w, int h) {
// Initialize background color
_backgroundColor[0] = 0.0;
_backgroundColor[1] = 0.0;
_backgroundColor[2] = 0.0;
_backgroundColor[3] = 0.0;
// Initialize box bound
_boxBound[0] = 0.0;
_boxBound[1] = 0.0;
_boxBound[2] = 0.0;
_boxBound[3] = 0.0;
// Initialize box color
_boxColor[0] = 1.0;
_boxColor[1] = 1.0;
_boxColor[2] = 1.0;
_boxColor[3] = 1.0;
// Initialize control point color
_controlPointColor[0] = 1.0;
_controlPointColor[1] = 1.0;
_controlPointColor[2] = 1.0;
_controlPointColor[3] = 1.0;
// Initialize control point size
_controlPointSize = 8;
// Initialize focus point index
_focusPoint = -1;
// Initialize focus point color
_focusPointColor[0] = 0.0;
_focusPointColor[1] = 0.0;
_focusPointColor[2] = 0.0;
_focusPointColor[3] = 1.0;
// Initialize frustum
_frustum[0] = 0.0;
_frustum[1] = 1.0;
_frustum[2] = 0.0;
_frustum[3] = 1.0;
_frustum[4] = -1.0;
_frustum[5] = 1.0;
// Initialize line color
_lineColor[0] = 1.0;
_lineColor[1] = 1.0;
_lineColor[2] = 1.0;
_lineColor[3] = 1.0;
// Initialize number of control points
_numberOfControlPoints = 0;
// Initialize opacity range
_opacityMaximum = 1.0;
_opacityMinimum = 0.0;
// Initialize size of window
_pixelDimensions[0] = w;
_pixelDimensions[1] = h;
// Initialize scalar range
_scalarMaximum = 1.0;
_scalarMinimum = 0.0;
// Initialize text color
_textColor[0] = 1.0;
_textColor[1] = 1.0;
_textColor[2] = 1.0;
_textColor[3] = 1.0;
// Initialize transfer function
ControlPoint controlPoint;
// First control point
controlPoint.SetScalar(0.0);
controlPoint.SetOpacity(0.0);
_controlPoint.push_back(controlPoint);
// Second control point
controlPoint.SetScalar(1.0);
controlPoint.SetOpacity(1.0);
_controlPoint.push_back(controlPoint);
// Increment number of control points
_numberOfControlPoints = 2;
}
bool OpacityTransferFunctionWidget::AddControlPoint(int px, int py) {
// Box coordinates
float bx = 0.0;
float by = 0.0;
// Control point
ControlPoint controlPoint;
// Function coordinates
float scalar = 0.0;
float opacity = 0.0;
// World coordinates
float wx = 0.0;
float wy = 0.0;
// Check that pixel coordinates are within world space
if (IsPixelInWorld(px, py) == true) {
// Get corresponding world coordinates
PixelToWorld(px, py, &wx, &wy);
// Check that world coordinates are within box space
if (IsWorldInBox(wx, wy) == true) {
// Get corresponding box coordinates
WorldToBox(wx, wy, &bx, &by);
// Get corresponding function coordinates
BoxToFunction(bx, by, &scalar, &opacity);
// Set control point
controlPoint.SetOpacity(opacity);
controlPoint.SetScalar(scalar);
// Add control point
_controlPoint.push_back(controlPoint);
// Sort control points
sort(_controlPoint.begin(), _controlPoint.end());
// Get index of newly added point
_focusPoint = GetControlPointIndex(scalar, opacity);
// Increment number of control points
_numberOfControlPoints++;
// Control point added
return true;
}
}
// Set focus point
_focusPoint = -1;
// Did not add control point
return false;
}
