GraphApplication添加了图形小部件，但显示屏上没有显示任何内容要如何解决？

我从这篇文章下载了 GraphApplication 来试用 Graph Widget。
https://community.st.com/s/question/0D50X0000ALvsTfSQJ/how-to-start-using-the-graph-widget-from-touchgfxopenrepository-in-touchgfx-designer
在将必要的代码添加到我的 Screen1View.cpp 并导入这些文件后，我正在使用 STM32F429i-Discovery Board 来显示此图，
Graph.hpp, GraphLine.hpp, AbstractGraph.hpp,
Graph.cpp、GraphLine.cpp、AbstractGraph.cpp。
该图仍未显示在我的 Screen1View 上。在显示屏上，它只显示来自 GraphApplication 示例的蓝色背景图像。
这是我的代码。

File Screen1View.hpp
#ifndef SCREEN1VIEW_HPP
#define SCREEN1VIEW_HPP
#include
#include
#include
class Screen1View : public Screen1ViewBase
{
public:
Screen1View();
virtual ~Screen1View() {}
virtual void setupScreen();
virtual void tearDownScreen();
virtual void handleTickEvent();
protected:
int tickCounter;
Graph graph;
};
#endif // SCREEN1VIEW_HPP

File Screen1View.cpp
#include
static int randomNumberBetween(int lowest, int highest);
static int randomNumberBetween(int lowest, int highest)
{
#ifdef SIMULATOR
return lowest + (highest - lowest) * rand() / RAND_MAX;
#else
uint32_t random = (touchgfx::HAL::getInstance()->getCPUCycles() * HAL::getInstance()->getCPUCycles());
return lowest + (random % (highest - lowest));
#endif
}
Screen1View::Screen1View()
{
}
void Screen1View::setupScreen()
{
//Screen1ViewBase::setupScreen();
// Place the graph on the screen
graph.setXY(20, 20);
// Set the outer dimensions and color of the graph
graph.setup(440, 200, Color::getColorFrom24BitRGB(0xFF, 0xFF, 0xAC));
// Set the range for the x and y axis of the graph. That is
// the max and min x/y value that can be displayed inside the
// dimension of the graph.
graph.setRange(0, 50, 0, 200);
// Set the line width in pixels
graph.setLineWidth(2);
add(graph);
}
void Screen1View::tearDownScreen()
{
Screen1ViewBase::tearDownScreen();
}
void Screen1View::handleTickEvent()
{
// Number of ticks between inserting a point in the graph
int interval = 5;
tickCounter++;
if (tickCounter % interval == 0)
{
// Insert a point in the graph.
// The Y value is a random number in the y range of the graph.
graph.addValue(tickCounter / interval, randomNumberBetween(graph.getRangeBottom(), graph.getRangeTop()));
}
if (tickCounter == 37 * interval)
{
// Change the range of the Y axis
graph.setRange(0, 50, 0, 400);
graph.invalidate();
}
if (tickCounter == 50 * interval)
{
// Reset the graph and start over
graph.setRange(0, 50, 0, 200);
graph.setLineWidth(2);
graph.clear();
graph.invalidate();
tickCounter = 0;
}
}