From fb20ee8bb3b2dcf7b66c4aa8c10aa322681a1346 Mon Sep 17 00:00:00 2001
From: opgrsankkar <opgrsankkar@gmail.com>
Date: Wed, 2 Aug 2017 22:53:35 +0530
Subject: [PATCH] Basic Fan
---
fan.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 97 insertions(+)
create mode 100644 fan.c
diff --git a/fan.c b/fan.c
new file mode 100644
index 0000000..e5d7688
--- /dev/null
+++ b/fan.c
@@ -0,0 +1,97 @@
+/**
+ * rotating fan
+ */
+#include <graphics.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+double rotatex(double x, double y, double angle, double pivotx, double pivoty){
+ return (x)*cos(angle) - (y)*sin(angle) + pivotx* (1-cos(angle)) + pivoty*(sin(angle));
+ // return (x - pivotx)*cos(angle) - (y - pivoty)*sin(angle) + pivotx;
+}
+double rotatey(double x, double y, double angle, double pivotx, double pivoty){
+ return (x)*sin(angle) + (y)*cos(angle) + pivoty* (1-cos(angle)) - pivotx*(sin(angle));
+ // return (x - pivotx)*sin(angle) - (y - pivoty)*cos(angle) + pivoty;
+}
+
+int kbhit()
+{
+ struct timeval tv;
+ fd_set fds;
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ FD_ZERO(&fds);
+ FD_SET(STDIN_FILENO, &fds); //STDIN_FILENO is 0
+ select(STDIN_FILENO+1, &fds, NULL, NULL, &tv);
+ return FD_ISSET(STDIN_FILENO, &fds);
+}
+
+int main()
+{
+
+ /* request autodetection */
+ int gdriver = DETECT, gmode, errorcode;
+ /* Local Variables */
+ double cx, cy;
+ double l1x1, l1y1, l1x2, l1y2;
+ double l1angle = 120 / 180.0 * 3.14;
+ double l2angle = 240 / 180.0 * 3.14;
+ double rotate_angle = 2 / 180.0 * 3.14;
+ int speed=1;
+ int i=0;
+
+ /* initialize graphics and local variables */
+ initgraph(&gdriver, &gmode, "");
+
+ cx = getmaxx() / 2;
+ cy = getmaxy() / 2;
+
+ l1x1 = cx;
+ l1y1 = cy - 20;
+ l1x2 = cx;
+ l1y2 = cy - 90;
+
+ while (!kbhit()) {
+ i++;
+ if(i>=60){
+ l1x1 = cx;
+ l1y1 = cy - 20;
+ l1x2 = cx;
+ l1y2 = cy - 90;
+ i=0;
+
+ }
+
+ circle((int)cx, (int)cy, 20);
+ line((int)l1x1, (int)l1y1, (int)l1x2,(int) l1y2);
+
+ line(
+ (int)rotatex(l1x1, l1y1, l1angle, cx, cy),
+ (int)rotatey(l1x1, l1y1, l1angle, cx, cy),
+ (int)rotatex(l1x2, l1y2, l1angle, cx, cy),
+ (int)rotatey(l1x2, l1y2, l1angle, cx, cy)
+ );
+
+ line(
+ (int)rotatex(l1x1, l1y1, l2angle, cx, cy),
+ (int)rotatey(l1x1, l1y1, l2angle, cx, cy),
+ (int)rotatex(l1x2, l1y2, l2angle, cx, cy),
+ (int)rotatey(l1x2, l1y2, l2angle, cx, cy)
+ );
+
+ /* prepare for next frame */
+ delay(15);
+ cleardevice();
+
+ l1x1 = rotatex(l1x1, l1y1, rotate_angle, cx, cy);
+ l1y1 = rotatey(l1x1, l1y1, rotate_angle, cx, cy);
+ l1x2 = rotatex(l1x2, l1y2, rotate_angle, cx, cy);
+ l1y2 = rotatey(l1x2, l1y2, rotate_angle, cx, cy);
+
+ }
+
+ /* clean up */
+ closegraph();
+ return 0;
+}
--
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