void PolygonalSkin::setPoints(const std::vector<FloatPoint>& _points)
{
if (_points.size() < 2)
{
mVertexCount = 0;
mResultVerticiesPos.clear();
mResultVerticiesUV.clear();
mLinePoints = _points;
return;
}
VectorFloatPoint finalPoints;
finalPoints.reserve(_points.size());
mLineLength = 0.0f;
FloatPoint point = _points[0];
finalPoints.push_back(point);
// ignore repeating points
for (std::vector<FloatPoint>::const_iterator iter = _points.begin() + 1; iter != _points.end(); ++iter)
{
if (point != *iter)
{
finalPoints.push_back(*iter);
mLineLength += len(iter->left - point.left, iter->top - point.top);
point = *iter;
}
}
mLinePoints = finalPoints;
#ifdef MYGUI_NO_POLYGONAL_SKIN_CROPPING
size_t count = (mLinePoints.size() - 1) * VertexQuad::VertexCount * 2;
#else
// it's too hard to calculate maximum possible verticies count and worst
// approximation gives 7 times more verticies than in not cropped geometry
// so we multiply count by 2, because this looks enough
size_t count = (mLinePoints.size() - 1) * VertexQuad::VertexCount * 2 * 2;
#endif
if (count > mVertexCount)
{
mVertexCount = count;
if (nullptr != mRenderItem) mRenderItem->reallockDrawItem(this, mVertexCount);
}
_updateView();
}
void PolygonalSkin::_rebuildGeometry()
{
if (mLinePoints.size() < 2) return;
if (!mRenderItem || !mRenderItem->getRenderTarget()) return;
mGeometryOutdated = false;
// using mCurrentCoord as rectangle where we draw polygons
// base texture coordinates
FloatPoint baseVerticiesUV[4] =
{
FloatPoint(mCurrentTexture.left, mCurrentTexture.top),
FloatPoint(mCurrentTexture.right, mCurrentTexture.top),
FloatPoint(mCurrentTexture.right, mCurrentTexture.bottom),
FloatPoint(mCurrentTexture.left, mCurrentTexture.bottom)
};
// UV vectors
FloatPoint vectorU = baseVerticiesUV[1] - baseVerticiesUV[0];
FloatPoint vectorV = baseVerticiesUV[3] - baseVerticiesUV[0];
FloatPoint vertex1;
FloatPoint vertex2;
mResultVerticiesPos.clear();
mResultVerticiesUV.clear();
// add first two verticies
FloatPoint normal = _getPerpendicular(mLinePoints[0], mLinePoints[1]);
FloatPoint points[2] = {mLinePoints[0] + normal, mLinePoints[0] - normal};
FloatPoint pointsUV[2] = {baseVerticiesUV[0], baseVerticiesUV[3]};
// add other verticies
float currentLength = 0.0f;
for (size_t i = 1; i < mLinePoints.size(); ++i)
{
currentLength += len(mLinePoints[i - 1].left - mLinePoints[i].left, mLinePoints[i - 1].top - mLinePoints[i].top);
// getting normal between previous and next point
if (i != mLinePoints.size() - 1)
normal = _getMiddleLine(mLinePoints[i - 1], mLinePoints[i + 1], mLinePoints[i]);
else
normal = _getPerpendicular(mLinePoints[i - 1], mLinePoints[i]);
bool edge = false;
bool sharp = false;
if (normal == FloatPoint() /*|| len(normal.left, normal.top) > mLineWidth * 2*/)
{
edge = true;
normal = _getPerpendicular(mLinePoints[i - 1], mLinePoints[i]);
}
else if (len(normal.left, normal.top) > mLineWidth * 1.5)
{
sharp = true;
normal = _getPerpendicular(mLinePoints[i - 1], mLinePoints[i]);
}
// check orientation
FloatPoint lineDir = mLinePoints[i] - mLinePoints[i - 1];
if (lineDir.left * normal.top - lineDir.top * normal.left < 0)
{
normal.left = -normal.left;
normal.top = -normal.top;
}
FloatPoint UVoffset(currentLength / mLineLength * vectorU.left, currentLength / mLineLength * vectorU.top);
mResultVerticiesPos.push_back(points[0]);
mResultVerticiesPos.push_back(points[1]);
mResultVerticiesPos.push_back(mLinePoints[i] + normal);
mResultVerticiesUV.push_back(pointsUV[0]);
mResultVerticiesUV.push_back(pointsUV[1]);
mResultVerticiesUV.push_back(baseVerticiesUV[0] + UVoffset);
mResultVerticiesPos.push_back(points[1]);
mResultVerticiesPos.push_back(mLinePoints[i] - normal);
mResultVerticiesPos.push_back(mLinePoints[i] + normal);
mResultVerticiesUV.push_back(pointsUV[1]);
mResultVerticiesUV.push_back(baseVerticiesUV[3] + UVoffset);
mResultVerticiesUV.push_back(baseVerticiesUV[0] + UVoffset);
points[edge ? 1 : 0] = mLinePoints[i] + normal;
points[edge ? 0 : 1] = mLinePoints[i] - normal;
pointsUV[0] = baseVerticiesUV[0] + UVoffset;
pointsUV[1] = baseVerticiesUV[3] + UVoffset;
if (sharp)
{
normal = _getMiddleLine(mLinePoints[i - 1], mLinePoints[i + 1], mLinePoints[i]);
float sharpness = len(normal.left, normal.top) / mLineWidth;
float length = len(normal.left, normal.top);
normal.left *= 2 * mLineWidth / length / (sharpness - 0.5f);
normal.top *= 2 * mLineWidth / length / (sharpness - 0.5f);
// check orientation
lineDir = mLinePoints[i] - mLinePoints[i - 1];
if (lineDir.left * normal.top - lineDir.top * normal.left < 0)
{
normal.left = -normal.left;
normal.top = -normal.top;
}
FloatPoint lineDir1 = mLinePoints[i] - mLinePoints[i - 1];
FloatPoint lineDir2 = mLinePoints[i + 1] - mLinePoints[i];
if (lineDir1.left * lineDir2.top - lineDir1.top * lineDir2.left > 0)
{
normal.left = -normal.left;
normal.top = -normal.top;
}
// check orientation
FloatPoint normal2 = _getPerpendicular(mLinePoints[i], mLinePoints[i + 1]);
lineDir = mLinePoints[i - 1] - mLinePoints[i];
if ((lineDir.left * normal2.top - lineDir.top * normal2.left < 0))
{
normal2.left = -normal2.left;
normal2.top = -normal2.top;
}
FloatPoint UVcenter((baseVerticiesUV[0].left + baseVerticiesUV[3].left) / 2, (baseVerticiesUV[0].top + baseVerticiesUV[3].top) / 2);
mResultVerticiesPos.push_back(points[0]);
mResultVerticiesPos.push_back(mLinePoints[i] + normal);
mResultVerticiesPos.push_back(mLinePoints[i]);
mResultVerticiesUV.push_back(pointsUV[0]);
mResultVerticiesUV.push_back(baseVerticiesUV[0] + UVoffset);
mResultVerticiesUV.push_back(UVcenter + UVoffset);
mResultVerticiesPos.push_back(mLinePoints[i] + normal);
mResultVerticiesPos.push_back(mLinePoints[i] + normal2);
mResultVerticiesPos.push_back(mLinePoints[i]);
mResultVerticiesUV.push_back(baseVerticiesUV[0] + UVoffset);
mResultVerticiesUV.push_back(baseVerticiesUV[0] + UVoffset);
mResultVerticiesUV.push_back(UVcenter + UVoffset);
points[0] = mLinePoints[i] + normal2;
points[1] = mLinePoints[i] - normal2;
pointsUV[0] = baseVerticiesUV[0] + UVoffset;
pointsUV[1] = baseVerticiesUV[3] + UVoffset;
}
}
#ifndef MYGUI_NO_POLYGONAL_SKIN_CROPPING
// crop triangles
IntCoord cropRectangle(
mCurrentCoord.left,
mCurrentCoord.top,
mCurrentCoord.width,
mCurrentCoord.height
);
VectorFloatPoint newResultVerticiesPos;
VectorFloatPoint newResultVerticiesUV;
newResultVerticiesPos.reserve(mResultVerticiesPos.size());
newResultVerticiesUV.reserve(mResultVerticiesPos.size());
for (size_t i = 0; i < mResultVerticiesPos.size(); i += 3)
{
VectorFloatPoint croppedTriangle =
geometry_utility::cropPolygon(&mResultVerticiesPos[i], 3, cropRectangle);
if (!croppedTriangle.empty())
{
FloatPoint v0 = mResultVerticiesUV[i + 2] - mResultVerticiesUV[i];
FloatPoint v1 = mResultVerticiesUV[i + 1] - mResultVerticiesUV[i];
for (size_t j = 1; j < croppedTriangle.size() - 1; ++j)
{
newResultVerticiesPos.push_back(croppedTriangle[0]);
newResultVerticiesPos.push_back(croppedTriangle[j]);
newResultVerticiesPos.push_back(croppedTriangle[j + 1]);
// calculate UV
FloatPoint point;
point = geometry_utility::getPositionInsideRect(croppedTriangle[0], mResultVerticiesPos[i], mResultVerticiesPos[i + 1], mResultVerticiesPos[i + 2]);
newResultVerticiesUV.push_back(geometry_utility::getUVFromPositionInsideRect(point, v0, v1, mResultVerticiesUV[i]));
point = geometry_utility::getPositionInsideRect(croppedTriangle[j], mResultVerticiesPos[i], mResultVerticiesPos[i + 1], mResultVerticiesPos[i + 2]);
newResultVerticiesUV.push_back(geometry_utility::getUVFromPositionInsideRect(point, v0, v1, mResultVerticiesUV[i]));
point = geometry_utility::getPositionInsideRect(croppedTriangle[j + 1], mResultVerticiesPos[i], mResultVerticiesPos[i + 1], mResultVerticiesPos[i + 2]);
newResultVerticiesUV.push_back(geometry_utility::getUVFromPositionInsideRect(point, v0, v1, mResultVerticiesUV[i]));
}
}
}
std::swap(mResultVerticiesPos, newResultVerticiesPos);
std::swap(mResultVerticiesUV, newResultVerticiesUV);
#endif
// now calculate widget base offset and then resulting position in screen coordinates
const RenderTargetInfo& info = mRenderItem->getRenderTarget()->getInfo();
float vertex_left_base = ((info.pixScaleX * (float)(mCroppedParent->getAbsoluteLeft()) + info.hOffset) * 2) - 1;
float vertex_top_base = -(((info.pixScaleY * (float)(mCroppedParent->getAbsoluteTop()) + info.vOffset) * 2) - 1);
for (size_t i = 0; i < mResultVerticiesPos.size(); ++i)
{
mResultVerticiesPos[i].left = vertex_left_base + mResultVerticiesPos[i].left * info.pixScaleX * 2;
mResultVerticiesPos[i].top = vertex_top_base + mResultVerticiesPos[i].top * info.pixScaleY * -2;
}
}