void CartesianGrid::drawGrid( PaintContext* context )
{
//qDebug() << "KDChart::CartesianGrid::drawGrid( PaintContext* context ) called";
CartesianCoordinatePlane* plane = dynamic_cast<CartesianCoordinatePlane*>(context->coordinatePlane());
// This plane is used for tranlating the coordinates - not for the data boundaries
PainterSaver p( context->painter() );
plane = dynamic_cast< CartesianCoordinatePlane* >( plane->sharedAxisMasterPlane( context->painter() ) );
Q_ASSERT_X ( plane, "CartesianGrid::drawGrid",
"Bad function call: PaintContext::coodinatePlane() NOT a cartesian plane." );
const GridAttributes gridAttrsX( plane->gridAttributes( Qt::Horizontal ) );
const GridAttributes gridAttrsY( plane->gridAttributes( Qt::Vertical ) );
//qDebug() << "OK:";
if ( !gridAttrsX.isGridVisible() && !gridAttrsY.isGridVisible() ) return;
//qDebug() << "A";
// important: Need to update the calculated mData,
// before we may use it!
updateData( context->coordinatePlane() );
if( plane->axesCalcModeX() == KDChart::AbstractCoordinatePlane::Logarithmic && mData.first().stepWidth == 0.0 )
mData.first().stepWidth = 1.0;
if( plane->axesCalcModeY() == KDChart::AbstractCoordinatePlane::Logarithmic && mData.last().stepWidth == 0.0 )
mData.last().stepWidth = 1.0;
// test for programming errors: critical
Q_ASSERT_X ( mData.count() == 2, "CartesianGrid::drawGrid",
"Error: updateData did not return exactly two dimensions." );
// test for invalid boundaries: non-critical
if( !isBoundariesValid( mData ) ) return;
//qDebug() << "B";
DataDimension dimX = mData.first();
const DataDimension& dimY = mData.last();
// test for other programming errors: critical
Q_ASSERT_X ( dimX.stepWidth, "CartesianGrid::drawGrid",
"Error: updateData returned a Zero step width for the X grid." );
Q_ASSERT_X ( dimY.stepWidth, "CartesianGrid::drawGrid",
"Error: updateData returned a Zero step width for the Y grid." );
qreal numberOfUnitLinesX =
qAbs( dimX.distance() / dimX.stepWidth )
+ (dimX.isCalculated ? 1.0 : 0.0);
qreal numberOfUnitLinesY =
qAbs( dimY.distance() / dimY.stepWidth )
+ (dimY.isCalculated ? 1.0 : 0.0);
//qDebug("numberOfUnitLinesX: %f numberOfUnitLinesY: %f",numberOfUnitLinesX,numberOfUnitLinesY);
// do not draw a Zero size grid (and do not divide by Zero)
if( numberOfUnitLinesX <= 0.0 || numberOfUnitLinesY <= 0.0 ) return;
//qDebug() << "C";
const QPointF p1 = plane->translate( QPointF(dimX.start, dimY.start) );
const QPointF p2 = plane->translate( QPointF(dimX.end, dimY.end) );
//qDebug() << "dimX.isCalculated:" << dimX.isCalculated << "dimY.isCalculated:" << dimY.isCalculated;
//qDebug() << "dimX.start: " << dimX.start << "dimX.end: " << dimX.end;
//qDebug() << "dimY.start: " << dimY.start << "dimY.end: " << dimY.end;
//qDebug() << "p1:" << p1 << " p2:" << p2;
const qreal screenRangeX = qAbs ( p1.x() - p2.x() );
const qreal screenRangeY = qAbs ( p1.y() - p2.y() );
/*
* let us paint the grid at a smaller resolution
* the user can disable at any time
* by setting the grid attribute to false
* Same Value as for Cartesian Axis
*/
static const qreal GridLineDistanceTreshold = 4.0; // <Treshold> pixels between each grid line
const qreal MinimumPixelsBetweenLines =
GridLineDistanceTreshold;
//qDebug() << "x step " << dimX.stepWidth << " y step " << dimY.stepWidth;
//qreal unitFactorX = 1.0;
// qreal unitFactorY = 1.0;
//FIXME(khz): Remove this code, and do the calculation in the grid calc function
if( ! dimX.isCalculated ){
while( screenRangeX / numberOfUnitLinesX <= MinimumPixelsBetweenLines ){
dimX.stepWidth *= 10.0;
dimX.subStepWidth *= 10.0;
numberOfUnitLinesX = qAbs( dimX.distance() / dimX.stepWidth );
}
}
if( dimX.subStepWidth && (screenRangeX / (dimX.distance() / dimX.subStepWidth) <= MinimumPixelsBetweenLines) ){
dimX.subStepWidth = 0.0;
//qDebug() << "de-activating grid sub steps: not enough space";
}
const bool drawUnitLinesX = gridAttrsX.isGridVisible() &&
(screenRangeX / numberOfUnitLinesX > MinimumPixelsBetweenLines);
const bool drawUnitLinesY = gridAttrsY.isGridVisible() &&
(screenRangeY / numberOfUnitLinesY > MinimumPixelsBetweenLines);
const bool isLogarithmicX = dimX.isCalculated && (dimX.calcMode == AbstractCoordinatePlane::Logarithmic );
const bool isLogarithmicY = (dimY.calcMode == AbstractCoordinatePlane::Logarithmic );
/*
while ( !drawUnitLinesX ) {
unitFactorX *= 10.0;
drawUnitLinesX = screenRangeX / (numberOfUnitLinesX / unitFactorX) > MinimumPixelsBetweenLines;
}
while ( !drawUnitLinesY ) {
unitFactorY *= 10.0;
drawUnitLinesY = screenRangeY / (numberOfUnitLinesY / unitFactorY) > MinimumPixelsBetweenLines;
}
*/
const bool drawSubGridLinesX = isLogarithmicX ||
((dimX.subStepWidth != 0.0) &&
(screenRangeX / (numberOfUnitLinesX / dimX.stepWidth * dimX.subStepWidth) > MinimumPixelsBetweenLines) &&
gridAttrsX.isSubGridVisible());
const bool drawSubGridLinesY = isLogarithmicY ||
((dimY.subStepWidth != 0.0) &&
(screenRangeY / (numberOfUnitLinesY / dimY.stepWidth * dimY.subStepWidth) > MinimumPixelsBetweenLines) &&
gridAttrsY.isSubGridVisible());
qreal minValueX = qMin( dimX.start, dimX.end );
qreal maxValueX = qMax( dimX.start, dimX.end );
qreal minValueY = qMin( dimY.start, dimY.end );
qreal maxValueY = qMax( dimY.start, dimY.end );
AbstractGrid::adjustLowerUpperRange( minValueX, maxValueX, dimX.stepWidth, true, true );
AbstractGrid::adjustLowerUpperRange( minValueY, maxValueY, dimY.stepWidth, true, true );
if ( drawSubGridLinesX ) {
context->painter()->setPen( PrintingParameters::scalePen( gridAttrsX.subGridPen() ) );
qreal f = minValueX;
qreal fLogSubstep = minValueX;
int logSubstep = 0;
while ( f <= maxValueX ) {
QPointF topPoint( f, maxValueY );
QPointF bottomPoint( f, minValueY );
topPoint = plane->translate( topPoint );
bottomPoint = plane->translate( bottomPoint );
context->painter()->drawLine( topPoint, bottomPoint );
if ( isLogarithmicX ){
if( logSubstep == 9 ){
fLogSubstep *= ( fLogSubstep > 0.0 ) ? 10.0 : 0.1;
if( fLogSubstep == 0.0 )
fLogSubstep = pow( 10.0, floor( log10( dimX.start ) ) );
logSubstep = 0;
f = fLogSubstep;
}
else
{
f += fLogSubstep;
}
++logSubstep;
}else{
f += dimX.subStepWidth;
}
if(maxValueX == 0 && minValueX == 0)
break;
}
}
if ( drawSubGridLinesY ) {
context->painter()->setPen( PrintingParameters::scalePen( gridAttrsY.subGridPen() ) );
qreal f = minValueY;
qreal fLogSubstep = minValueY;
int logSubstep = 0;
while ( f <= maxValueY ) {
//qDebug() << "sub grid line Y at" << f;
QPointF leftPoint( minValueX, f );
QPointF rightPoint( maxValueX, f );
leftPoint = plane->translate( leftPoint );
rightPoint = plane->translate( rightPoint );
context->painter()->drawLine( leftPoint, rightPoint );
if ( isLogarithmicY ){
if( logSubstep == 9 ){
fLogSubstep *= ( fLogSubstep > 0.0 ) ? 10.0 : 0.1;
if( fLogSubstep == 0.0 )
fLogSubstep = pow( 10.0, floor( log10( dimY.start ) ) );
logSubstep = 0;
f = fLogSubstep;
}
else
{
f += fLogSubstep;
}
++logSubstep;
}else{
f += dimY.subStepWidth;
}
if(maxValueY == 0 && minValueY == 0)
break;
}
}
const bool drawXZeroLineX
= dimX.isCalculated &&
gridAttrsX.zeroLinePen().style() != Qt::NoPen;
const bool drawZeroLineY
= gridAttrsY.zeroLinePen().style() != Qt::NoPen;
const bool drawOuterX = gridAttrsX.isOuterLinesVisible();
const bool drawOuterY = gridAttrsY.isOuterLinesVisible();
const QPointF bottomRightPoint = plane->translate( QPointF( maxValueX, minValueY ) );
if ( drawUnitLinesX || drawXZeroLineX ) {
//qDebug() << "E";
if ( drawUnitLinesX )
context->painter()->setPen( PrintingParameters::scalePen( gridAttrsX.gridPen() ) );
// const qreal minX = dimX.start;
qreal f = minValueX;
while ( f <= maxValueX ) {
// PENDING(khz) FIXME: make draving/not drawing of Zero line more sophisticated?:
const bool zeroLineHere = drawXZeroLineX && (f == 0.0);
if ( drawUnitLinesX || zeroLineHere ){
//qDebug("main grid line X at: %f --------------------------",f);
QPointF topPoint( f, maxValueY );
QPointF bottomPoint( f, minValueY );
topPoint = plane->translate( topPoint );
bottomPoint = plane->translate( bottomPoint );
const qreal penWidth = context->painter()->pen().widthF();
if ( zeroLineHere )
context->painter()->setPen( PrintingParameters::scalePen( gridAttrsX.zeroLinePen() ) );
if ( drawOuterX || (topPoint.x()> 2 * penWidth && topPoint.x()<bottomRightPoint.x()-2.0 * penWidth) )
context->painter()->drawLine( topPoint, bottomPoint );
if ( zeroLineHere )
context->painter()->setPen( PrintingParameters::scalePen( gridAttrsX.gridPen() ) );
}
if ( isLogarithmicX ) {
f *= ( f > 0.0 ) ? 10.0 : 0.1;
if( f == 0.0 )
f = pow( 10.0, floor( log10( dimX.start ) ) );
}
else
f += dimX.stepWidth;
if(maxValueX == 0 && minValueX == 0)
break;
}
// draw the last line if not logarithmic calculation
// we need the in order to get the right grid line painted
// when f + dimX.stepWidth jump over maxValueX
if ( ! isLogarithmicX && drawOuterX )
context->painter()->drawLine( plane->translate( QPointF( maxValueX, maxValueY ) ),
plane->translate( QPointF( maxValueX, minValueY ) ) );
}
if ( drawUnitLinesY || drawZeroLineY ) {
//qDebug() << "F";
if ( drawUnitLinesY )
context->painter()->setPen( PrintingParameters::scalePen( gridAttrsY.gridPen() ) );
//const qreal minY = dimY.start;
//qDebug("minY: %f maxValueY: %f dimY.stepWidth: %f",minY,maxValueY,dimY.stepWidth);
qreal f = minValueY;
while ( f <= maxValueY ) {
// PENDING(khz) FIXME: make draving/not drawing of Zero line more sophisticated?:
//qDebug("main grid line Y at: %f",f);
const bool zeroLineHere = (f == 0.0);
if ( drawUnitLinesY || zeroLineHere ){
QPointF leftPoint( minValueX, f );
QPointF rightPoint( maxValueX, f );
leftPoint = plane->translate( leftPoint );
rightPoint = plane->translate( rightPoint );
if ( zeroLineHere )
context->painter()->setPen( PrintingParameters::scalePen( gridAttrsY.zeroLinePen() ) );
if ( drawOuterY || (leftPoint.y()>2.0 && leftPoint.y()<bottomRightPoint.y()-2.0) )
context->painter()->drawLine( leftPoint, rightPoint );
if ( zeroLineHere )
context->painter()->setPen( PrintingParameters::scalePen( gridAttrsY.gridPen() ) );
}
if ( isLogarithmicY ) {
f *= ( f > 0.0 ) ? 10.0 : 0.1;
if( f == 0.0 )
f = pow( 10.0, floor( log10( dimY.start ) ) );
}
else
f += dimY.stepWidth;
if(maxValueY == 0 && minValueY == 0)
break;
}
}
//qDebug() << "Z";
}
DataDimensionsList CartesianGrid::calculateGrid(
const DataDimensionsList& rawDataDimensions ) const
{
Q_ASSERT_X ( rawDataDimensions.count() == 2, "CartesianGrid::calculateGrid",
"Error: calculateGrid() expects a list with exactly two entries." );
CartesianCoordinatePlane* plane = dynamic_cast<CartesianCoordinatePlane*>( mPlane );
Q_ASSERT_X ( plane, "CartesianGrid::calculateGrid",
"Error: PaintContext::calculatePlane() called, but no cartesian plane set." );
DataDimensionsList l( rawDataDimensions );
// rule: Returned list is either empty, or it is providing two
// valid dimensions, complete with two non-Zero step widths.
if( isBoundariesValid( l ) ) {
const QPointF translatedBottomLeft( plane->translateBack( plane->geometry().bottomLeft() ) );
const QPointF translatedTopRight( plane->translateBack( plane->geometry().topRight() ) );
//qDebug() << "CartesianGrid::calculateGrid() first:" << l.first().start << l.first().end << " last:" << l.last().start << l.last().end;
//qDebug() << "CartesianGrid::calculateGrid() translated x:" << translatedBottomLeft.x() << translatedTopRight.x() << " y:" << translatedBottomLeft.y() << translatedTopRight.y();
//qDebug() << "CartesianGrid::calculateGrid() raw data y-range :" << l.last().end - l.last().start;
//qDebug() << "CartesianGrid::calculateGrid() translated y-range:" << translatedTopRight.y() - translatedBottomLeft.y();
/* Code is obsolete. The dataset dimension of the diagram should *never* be > 1.
if( l.first().isCalculated
&& plane->autoAdjustGridToZoom()
&& plane->axesCalcModeX() == CartesianCoordinatePlane::Linear
&& plane->zoomFactorX() > 1.0 )
{
l.first().start = translatedBottomLeft.x();
l.first().end = translatedTopRight.x();
}
*/
const GridAttributes gridAttrsX( plane->gridAttributes( Qt::Horizontal ) );
const GridAttributes gridAttrsY( plane->gridAttributes( Qt::Vertical ) );
const DataDimension dimX
= calculateGridXY( l.first(), Qt::Horizontal,
gridAttrsX.adjustLowerBoundToGrid(),
gridAttrsX.adjustUpperBoundToGrid() );
if( dimX.stepWidth ){
//qDebug("CartesianGrid::calculateGrid() l.last().start: %f l.last().end: %f", l.last().start, l.last().end);
//qDebug(" l.first().start: %f l.first().end: %f", l.first().start, l.first().end);
// one time for the min/max value
const DataDimension minMaxY
= calculateGridXY( l.last(), Qt::Vertical,
gridAttrsY.adjustLowerBoundToGrid(),
gridAttrsY.adjustUpperBoundToGrid() );
if( plane->autoAdjustGridToZoom()
&& plane->axesCalcModeY() == CartesianCoordinatePlane::Linear
&& plane->zoomFactorY() > 1.0 )
{
l.last().start = translatedBottomLeft.y();
l.last().end = translatedTopRight.y();
}
// and one other time for the step width
const DataDimension dimY
= calculateGridXY( l.last(), Qt::Vertical,
gridAttrsY.adjustLowerBoundToGrid(),
gridAttrsY.adjustUpperBoundToGrid() );
if( dimY.stepWidth ){
l.first().start = dimX.start;
l.first().end = dimX.end;
l.first().stepWidth = dimX.stepWidth;
l.first().subStepWidth = dimX.subStepWidth;
l.last().start = minMaxY.start;
l.last().end = minMaxY.end;
l.last().stepWidth = dimY.stepWidth;
l.last().subStepWidth = dimY.subStepWidth;
//qDebug() << "CartesianGrid::calculateGrid() final grid y-range:" << l.last().end - l.last().start << " step width:" << l.last().stepWidth << endl;
// calculate some reasonable subSteps if the
// user did not set the sub grid but did set
// the stepWidth.
// FIXME (Johannes)
// the last (y) dimension is not always the dimension for the ordinate!
// since there's no way to check for the orientation of this dimension here,
// we cannot automatically assume substep values
//if ( dimY.subStepWidth == 0 )
// l.last().subStepWidth = dimY.stepWidth/2;
//else
// l.last().subStepWidth = dimY.subStepWidth;
}
}
}
//qDebug() << "CartesianGrid::calculateGrid() final grid Y-range:" << l.last().end - l.last().start << " substep width:" << l.last().subStepWidth;
//qDebug() << "CartesianGrid::calculateGrid() final grid X-range:" << l.first().end - l.first().start << " substep width:" << l.first().subStepWidth;
return l;
}