1

直接在青天與滿地紅的圖案中, 利用白色作為畫線顏色, 將第二組的 ABED 等四個點的座標, 以直線相連

#include <stdio.h>
#include <gd.h>
#include <math.h>

void draw_roc_flag(gdImagePtr img);

int main() {
    int width = 1200;
    int height = (int)(width * 2.0 / 3.0);

    gdImagePtr img = gdImageCreateTrueColor(width, height);
    gdImageAlphaBlending(img, 0);

    draw_roc_flag(img);

    FILE *outputFile = fopen("roc_flag.png", "wb");
    if (outputFile == NULL) {
        fprintf(stderr, "Error opening the output file.\n");
        return 1;
    }
    gdImagePngEx(img, outputFile, 9);
    fclose(outputFile);
    gdImageDestroy(img);
    return 0;
}

void draw_roc_flag(gdImagePtr img) {
    int width = gdImageSX(img);
    int height = gdImageSY(img);
    int red, white, blue;
    int center_x = (int)(width / 4);
    int center_y = (int)(height / 4);

    red = gdImageColorAllocate(img, 255, 0, 0);
    white = gdImageColorAllocate(img, 255, 255, 255);
    blue = gdImageColorAllocate(img, 0, 0, 149);

    gdImageFilledRectangle(img, 0, 0, width, height, red);
    gdImageFilledRectangle(img, 0, 0, (int)(width / 2.0), (int)(height / 2.0), blue);

    int A_x = 429;
    int A_y = 125;
    int B_x = 279;
    int B_y = 165;
    int E_x = 170;
    int E_y = 274;
    int D_x = 319;
    int D_y = 234;

    gdImageLine(img, A_x, A_y, B_x, B_y, white);
    gdImageLine(img, B_x, B_y, E_x, E_y, white);
    gdImageLine(img, E_x, E_y, D_x, D_y, white);
    gdImageLine(img, D_x, D_y, A_x, A_y, white);
}

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