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/*
* Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
* Copyright (C) 2010 François Sausset (sausset@gmail.com). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(MATHML)
#include "RenderMathMLSquareRoot.h"
#include "GraphicsContext.h"
#include "MathMLNames.h"
#include "Path.h"
namespace WebCore {
using namespace MathMLNames;
// Bottom padding of the radical (px)
const int gRadicalBasePad = 3;
// Threshold above which the radical shape is modified to look nice with big bases (%)
const float gThresholdBaseHeight = 1.5f;
// Radical width (%)
const float gRadicalWidth = 0.75f;
// Horizontal position of the bottom point of the radical (%)
const float gRadicalBottomPointXPos= 0.5f;
// Horizontal position of the top left point of the radical (%)
const float gRadicalTopLeftPointXPos = 0.2f;
// Vertical position of the top left point of the radical (%)
const float gRadicalTopLeftPointYPos = 0.5f;
// Vertical shift of the left end point of the radical (%)
const float gRadicalLeftEndYShift = 0.05f;
// Additional bottom root padding (%)
const float gRootBottomPadding = 0.2f;
// Radical line thickness (%)
const float gRadicalLineThickness = 0.02f;
// Radical thick line thickness (%)
const float gRadicalThickLineThickness = 0.1f;
RenderMathMLSquareRoot::RenderMathMLSquareRoot(Node *expression)
: RenderMathMLBlock(expression)
{
}
void RenderMathMLSquareRoot::paint(PaintInfo& info, int tx, int ty)
{
RenderMathMLBlock::paint(info, tx, ty);
if (info.context->paintingDisabled())
return;
tx += x();
ty += y();
int maxHeight = 0;
int width = 0;
RenderObject* current = firstChild();
while (current) {
if (current->isBoxModelObject()) {
RenderBoxModelObject* box = toRenderBoxModelObject(current);
// Check to see if this box has a larger height
if (box->offsetHeight() > maxHeight)
maxHeight = box->offsetHeight();
width += box->offsetWidth();
}
current = current->nextSibling();
}
// default to the font size in pixels if we're empty
if (!maxHeight)
maxHeight = style()->fontSize();
int frontWidth = static_cast<int>(style()->fontSize() * gRadicalWidth);
int topStartShift = 0;
// Base height above which the shape of the root changes
int thresholdHeight = static_cast<int>(gThresholdBaseHeight * style()->fontSize());
if (maxHeight > thresholdHeight && thresholdHeight) {
float shift = (maxHeight - thresholdHeight) / static_cast<float>(thresholdHeight);
if (shift > 1.)
shift = 1.0f;
topStartShift = static_cast<int>(gRadicalBottomPointXPos * frontWidth * shift);
}
width += topStartShift;
FloatPoint topStart(tx + frontWidth - topStartShift, ty);
FloatPoint bottomLeft(tx + frontWidth * gRadicalBottomPointXPos , ty + maxHeight + gRadicalBasePad);
FloatPoint topLeft(tx + frontWidth * gRadicalTopLeftPointXPos , ty + gRadicalTopLeftPointYPos * maxHeight);
FloatPoint leftEnd(tx , topLeft.y() + gRadicalLeftEndYShift * style()->fontSize());
info.context->save();
info.context->setStrokeThickness(gRadicalLineThickness * style()->fontSize());
info.context->setStrokeStyle(SolidStroke);
info.context->setStrokeColor(style()->visitedDependentColor(CSSPropertyColor), ColorSpaceDeviceRGB);
info.context->setLineJoin(MiterJoin);
info.context->setMiterLimit(style()->fontSize());
Path root;
root.moveTo(FloatPoint(topStart.x() + width , ty));
// draw top
root.addLineTo(topStart);
// draw from top left corner to bottom point of radical
root.addLineTo(bottomLeft);
// draw from bottom point to top of left part of radical base "pocket"
root.addLineTo(topLeft);
// draw to end
root.addLineTo(leftEnd);
info.context->strokePath(root);
info.context->save();
// Build a mask to draw the thick part of the root.
Path mask;
mask.moveTo(topStart);
mask.addLineTo(bottomLeft);
mask.addLineTo(topLeft);
mask.addLineTo(FloatPoint(2 * topLeft.x() - leftEnd.x(), 2 * topLeft.y() - leftEnd.y()));
info.context->clip(mask);
// Draw the thick part of the root.
info.context->setStrokeThickness(gRadicalThickLineThickness * style()->fontSize());
info.context->setLineCap(SquareCap);
Path line;
line.moveTo(bottomLeft);
line.addLineTo(topLeft);
info.context->strokePath(line);
info.context->restore();
info.context->restore();
}
void RenderMathMLSquareRoot::layout()
{
int maxHeight = 0;
RenderObject* current = firstChild();
while (current) {
if (current->isBoxModelObject()) {
RenderBoxModelObject* box = toRenderBoxModelObject(current);
if (box->offsetHeight() > maxHeight)
maxHeight = box->offsetHeight();
box->style()->setVerticalAlign(BASELINE);
}
current = current->nextSibling();
}
if (!maxHeight)
maxHeight = style()->fontSize();
if (maxHeight > static_cast<int>(gThresholdBaseHeight * style()->fontSize()))
style()->setPaddingBottom(Length(static_cast<int>(gRootBottomPadding * style()->fontSize()), Fixed));
RenderBlock::layout();
}
}
#endif // ENABLE(MATHML)
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