用emwin图形库生成一个自定义波形图，可以在模拟器上运行的完整代码

以下是一个使用emWin图形库生成自定义波形图的示例代码：

#include "GUI.h"
#include "DIALOG.h"
#include <math.h>

#define PI 3.14159265358979323846

static void DrawGraph(WM_HWIN hWin) {
    GUI_RECT Rect;
    int x, y, i;
    float amplitude = 50.0f;
    float frequency = 0.1f;
    float phase = 0.0f;
    float step = 1.0f;
    int numPoints = 1000;
    float points[numPoints][2];
    float xVal = 0.0f, yVal = 0.0f;

    /* Generate data points for the waveform */
    for (i = 0; i < numPoints; i++) {
        xVal = i * step;
        yVal = amplitude * sin(2 * PI * frequency * xVal + phase);
        points[i][0] = xVal;
        points[i][1] = yVal;
    }

    /* Draw the waveform */
    Rect.x0 = 10;
    Rect.y0 = 10;
    Rect.x1 = 230;
    Rect.y1 = 110;
    GUI_SetPenSize(2);
    GUI_SetColor(GUI_GREEN);
    GUI_DrawRect(Rect.x0, Rect.y0, Rect.x1, Rect.y1);
    GUI_SetColor(GUI_RED);
    for (i = 0; i < numPoints - 1; i++) {
        x = (int)points[i][0];
        y = (int)points[i][1];
        GUI_DrawLine(Rect.x0 + x, Rect.y1 - y, Rect.x0 + x + 1, Rect.y1 - (int)points[i + 1][1]);
    }
}

void MainTask(void) {
    GUI_Init();
    WM_SetSize(WM_HBKWIN, 320, 240);  // Set screen size to match emulator
    WM_SetDesktopColor(GUI_WHITE);
    DrawGraph(WM_HBKWIN);
    while (1) {
        GUI_Delay(100);
    }
}

这个代码生成一个简单的正弦波形图，并在模拟器上显示。可以通过调整幅度、频率、相位和数据点数量来调整波形的形状。