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英國國旗

#include <stdio.h>
#include <gd.h>
#include <math.h>
 
void draw_uk_flag(gdImagePtr img);
void fillTriangle(gdImagePtr img, int x1, int y1, int x2, int y2, int x3, int y3, int color);
 
int main() {
    // 設置國旗的寬和高
    int width = 1200;
    int height = width / 2;
 
    // 創建圖像
    gdImagePtr img = gdImageCreateTrueColor(width, height);
    gdImageAlphaBlending(img, 0);
 
    // 繪製英國國旗
    draw_uk_flag(img);
 
    // 將圖像保存到文件
    FILE *outputFile = fopen("./../images/uk_flag.png", "wb");
    if (outputFile == NULL) {
        fprintf(stderr, "打開输出文件時發生錯誤。\n");
        return 1;
    }
    gdImagePngEx(img, outputFile, 9);
    fclose(outputFile);
    gdImageDestroy(img);
    return 0;
}
 
 
 
void draw_uk_flag(gdImagePtr img) {
    int width = gdImageSX(img);
    int height = gdImageSY(img);
 
    int red, white, blue;
    red = gdImageColorAllocate(img, 204, 0, 0);       // 红色
    white = gdImageColorAllocate(img, 255, 255, 255); // 白色
    blue = gdImageColorAllocate(img, 0, 0, 153);      // 藍色
 
    gdImageFilledRectangle(img, 0, 0, width, height, blue);
 
 
  int x1, y1, x2, y2, x3, y3;
  {
    int line_thickness = 100;
    gdImageSetThickness(img, line_thickness);
 
    int x1, y1, x2, y2, x3, y3;
 
    // 繪製白色斜線
    x1 = 0;
    y1 = 600;
    x2 = 1200;
    y2 = 0;
    gdImageLine(img, x1, y1, x2, y2, white);
 
    x1 = 0;
    y1 = 0;
    x2 = 1200;
    y2 = 600;
    gdImageLine(img, x1, y1, x2, y2, white);
}
  {
    int line_thickness = 33;
    gdImageSetThickness(img, line_thickness);
 
 
    // 繪製红色斜線
    x1 = 566;
    y1 = 300;
    x2 = 1166;
    y2 = 0;
    gdImageLine(img, x1, y1, x2, y2, red);
 
    x1 = 1233;
    y1 = 600;
    x2 = 633;
    y2 = 300;
    gdImageLine(img, x1, y1, x2, y2, red);
 
    x1 = 566;
    y1 = 300;
    x2 = -33;
    y2 = 0;
    gdImageLine(img, x1, y1, x2, y2, red);
 
    x1 = 600;
    y1 = 316.5;
    x2 = 0;
    y2 = 616.5;
    gdImageLine(img, x1, y1, x2, y2, red);
  }
  {
  int line_thickness = 33;
  gdImageSetThickness(img, line_thickness);
 
  int x1, y1, x2, y2, x3, y3;
 
  // 繪製  斜線
  x1 = 0;
  y1 = 600;
  x2 = 1200;
  y2 = 0;
  gdImageLine(img, x1, y1, x2, y2, red );
 
 
  x1 = 1200;
    y1 = 16.5;
    x2 = 600;
    y2 = 316.5;
    gdImageLine(img, x1, y1, x2, y2, white);
 
 
  x1 = 0;
    y1 = 583.5;
    x2 = 600;
    y2 = 283.5;
    gdImageLine(img, x1, y1, x2, y2, white);
 
 
  }
 
    // 繪製白色十字
    int cross_width = width / 32;
    int cross_arm_width = width / 32;
    int center_x = width / 2;
    int center_y = height / 2;
 
    gdImageFilledRectangle(img, center_x + 2.7 * cross_width, 0, center_x - 2.7 * cross_width, height, white);
    gdImageFilledRectangle(img, 0, center_y + 2.7 * cross_arm_width, width, center_y - 2.7 * cross_arm_width, white);
 
    // 繪製红色十字
    gdImageFilledRectangle(img, center_x + 1.5 * cross_width, 0, center_x - 1.5 * cross_width, height, red);
    gdImageFilledRectangle(img, 0, center_y + 1.5 * cross_arm_width, width, center_y - 1.5 * cross_arm_width, red);
}
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