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Fix graph blocks rendering optimization (#1164)

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This commit is contained in:
Adam Zambrzycki 2019-02-05 16:21:02 +01:00 committed by xarkes
parent 8c82449423
commit 3493eae194
1 changed files with 14 additions and 9 deletions
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23
src/widgets/GraphView.cpp
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@ -416,8 +416,8 @@ void GraphView::paintEvent(QPaintEvent *event)
int render_offset_x = -horizontalScrollBar()->value() * current_scale;
int render_offset_y = -verticalScrollBar()->value() * current_scale;
int render_width = viewport()->size().width() / current_scale;
int render_height = viewport()->size().height() / current_scale;
int render_width = viewport()->size().width();
int render_height = viewport()->size().height();
// Do we have scrollbars?
bool hscrollbar = horizontalScrollBar()->pageStep() < width * current_scale;
@ -450,12 +450,17 @@ void GraphView::paintEvent(QPaintEvent *event)
for (auto &blockIt : blocks) {
GraphBlock &block = blockIt.second;
// Check if block is visible
if ((block.x + block.width > -render_offset_x) ||
(block.y + block.height > -render_offset_y) ||
(-render_offset_x + render_width > block.x) ||
(-render_offset_y + render_height > block.y)) {
// Only draw block if it is visible
qreal blockXRender = block.x * current_scale;
qreal blockYRender = block.y * current_scale;
qreal blockWidthRender = block.width * current_scale;
qreal blockHeightRender = block.height * current_scale;
// Check if block is visible by checking if block intersects with view area
if (-render_offset_x < blockXRender + blockWidthRender
&& -render_offset_x + render_width > blockXRender
&& -render_offset_y < blockYRender + blockHeightRender
&& -render_offset_y + render_height > blockYRender) {
// If it intersects then draw it
drawBlock(p, block);
}
@ -469,7 +474,7 @@ void GraphView::paintEvent(QPaintEvent *event)
QPen pen(edge.color);
// if(blockSelected)
// pen.setStyle(Qt::DashLine);
pen.setWidth(pen.width()/ec.width_scale);
pen.setWidth(pen.width() / ec.width_scale);
p.setPen(pen);
p.setBrush(edge.color);
p.drawPolyline(edge.polyline);