init

1 files changed, 62 insertions, 0 deletions

diff --git a/src/1/main.c b/src/1/main.c
new file mode 100644
index 0000000..f75eca5
--- /dev/null
+++ b/src/1/main.c
@@ -0,0 +1,62 @@
+#include <GL/glut.h>
+#include <stdlib.h>
+#include <time.h>
+
+typedef GLfloat point2[2];
+
+float rand_float() { return 1 * (float)rand() / (float)RAND_MAX; }
+
+void myInit() {
+    glClearColor(1.0, 1.0, 1.0, 1.0);
+    glColor3f(rand_float(), rand_float(), rand_float());
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluOrtho2D(0.0, 500.0, 0.0, 500.0);
+    glMatrixMode(GL_MODELVIEW);
+}
+
+void triangle(point2 a, point2 b, point2 c) {
+    glBegin(GL_TRIANGLES);
+    glVertex2fv(a);
+    glVertex2fv(b);
+    glVertex2fv(c);
+    glEnd();
+}
+
+void divide_triangle(point2 a, point2 b, point2 c, int k) {
+    point2 ab, ac, bc;
+    int j;
+    if (k > 0) {
+        for (j = 0; j < 2; j++)
+            ab[j] = (a[j] + b[j]) / 2;
+        for (j = 0; j < 2; j++)
+            ac[j] = (a[j] + c[j]) / 2;
+        for (j = 0; j < 2; j++)
+            bc[j] = (b[j] + c[j]) / 2;
+
+        divide_triangle(a, ab, ac, k - 1);
+        divide_triangle(c, ac, bc, k - 1);
+        divide_triangle(b, bc, ab, k - 1);
+    } else {
+        triangle(a, b, c);
+    }
+}
+
+void display() {
+    glClear(GL_COLOR_BUFFER_BIT);
+    point2 v[3] = {{0.0, 0.0}, {250.0, 500.0}, {500.0, 0.0}};
+    divide_triangle(v[0], v[1], v[2], 8);
+    glFlush();
+}
+
+int main(int argc, char *argv[]) {
+    srand(time(0));
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+    glutInitWindowSize(500, 500);
+    glutInitWindowPosition(0, 0);
+    glutCreateWindow("Sierpinski Gasket");
+    glutDisplayFunc(display);
+    myInit();
+    glutMainLoop();
+}