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qcustomplot 大量数据拖拽卡顿，开启opengl

news 2025/8/2 6:36:09

记录一下qcustomplot在加载大量数据情况下卡顿的解决办法。

1. 导入库文件

QT       += core gui  opengl
DEFINES += QCUSTOMPLOT_USE_OPENGLwin32:LIBS += -lOpengl32 \-lglu32 \-lglut

2. 开启opengl

customplot->setOpenGl(true);

3. 解决opengl异常缩放问题

修改qcustomplot.cpp源码中mGlPaintDevice.data()->setDevicePixelRatio(mDevicePixelRatio);改为 mGlPaintDevice.data()->setDevicePixelRatio(1.0);

void QCPPaintBufferGlFbo::reallocateBuffer()
{// release and delete possibly existing framebuffer:if (mGlFrameBuffer){if (mGlFrameBuffer->isBound())mGlFrameBuffer->release();delete mGlFrameBuffer;mGlFrameBuffer = 0;}if (mGlContext.isNull()){qDebug() << Q_FUNC_INFO << "OpenGL context doesn't exist";return;}if (mGlPaintDevice.isNull()){qDebug() << Q_FUNC_INFO << "OpenGL paint device doesn't exist";return;}// create new fbo with appropriate size:mGlContext.data()->makeCurrent(mGlContext.data()->surface());QOpenGLFramebufferObjectFormat frameBufferFormat;frameBufferFormat.setSamples(mGlContext.data()->format().samples());frameBufferFormat.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);mGlFrameBuffer = new QOpenGLFramebufferObject(mSize*mDevicePixelRatio, frameBufferFormat);if (mGlPaintDevice.data()->size() != mSize*mDevicePixelRatio)mGlPaintDevice.data()->setSize(mSize*mDevicePixelRatio);
#ifdef QCP_DEVICEPIXELRATIO_SUPPORTED// mGlPaintDevice.data()->setDevicePixelRatio(mDevicePixelRatio);mGlPaintDevice.data()->setDevicePixelRatio(1.0);
#endif}