104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
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#include<graphics.h>
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#include<stdio.h>
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#include<conio.h>
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#include<math.h>
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#include<dos.h>
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// Calculates new co-ordinates of a figure after
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// rotating it at an angle about a point (cx,cy)
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void rotate( int figure[], int edges, double angle, int cx, int cy ) {
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double x, y;
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angle = -1 * (angle*3.14/180);
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double cos_a = cos(angle);
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double sin_a = sin(angle);
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for (int i=0; i < edges; i++) {
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x = figure[2*i] - cx;
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y = figure[2*i+1] - cy;
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figure[2*i] = floor( (x * cos_a) - (y * sin_a) + cx + 0.5 );
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figure[2*i+1] = floor( (x * sin_a)+(y * cos_a) + cy + 0.5 );
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}
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}
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void drawClock(int,int,int);
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void main() {
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int second_hand[4],minute_hand[4], hour_hand[4], edges = 2 ;
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double angle;
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int cx=300, cy=200;
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int gd = DETECT, gm;
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initgraph( &gd, &gm, "" );
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int max_y = getmaxy();
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clrscr();
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cleardevice();
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angle = -6;
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// Set the initial position of the second, minute and the hour hands.
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second_hand[0] = cx ;
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second_hand[1] = max_y - cy;
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second_hand[2] = cx;
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second_hand[3] = max_y - 320;
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hour_hand[0] = cx;
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hour_hand[1] = max_y - cy;
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hour_hand[2] = cx + 90;
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hour_hand[3] = max_y - 200;
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minute_hand[0] = cx;
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minute_hand[1] = max_y - cy;
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minute_hand[2] = cx;
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minute_hand[3] = max_y - 310;
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cleardevice();
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setbkcolor(WHITE);
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// Draw the clock
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drawClock(cx,max_y - cy,150);
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setlinestyle(SOLID_FILL,0,1);
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// Draw the minute and the hour hand
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drawpoly(2,minute_hand);
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drawpoly(2,hour_hand);
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int i=0;
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while(!kbhit()) {
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setcolor(RED);
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drawpoly(2,second_hand);
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setcolor(GREEN);
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drawpoly(2,minute_hand);
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setcolor(BLUE);
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drawpoly(2,hour_hand);
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delay(1000);
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// set delay(10) to tick the clock fast
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setcolor(15);
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drawpoly(2,second_hand);
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rotate(second_hand,edges,angle,cx,max_y - cy);
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i++;
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// Reset the second hand and move the minute hand
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// when the second hand has moved 60 times.
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if(i%60 == 0) {
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second_hand[0] = cx ;
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second_hand[1] = max_y - cy;
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second_hand[2] = cx;
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second_hand[3] = max_y - 320;
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drawpoly(2,minute_hand);
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rotate(minute_hand,edges,angle,cx,max_y - cy);
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}
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// Move the minute hand
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// when the second hand has moved 720 (60*12) times.
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if(i%720 == 0) {
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i = 0;
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drawpoly(2,hour_hand);
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rotate(hour_hand,edges,angle,cx,max_y - cy);
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}
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}
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getch();
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}
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// Function to draw the clock
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void drawClock(int cx, int cy, int r) {
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setcolor(GREEN);
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setlinestyle(SOLID_FILL,0,3);
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circle(cx,cy,r);
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int max_y = getmaxy();
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int center[2] = {
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cx, max_y - 340
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}
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;
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for (int i=0; i<60; i++) {
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if(i%5 == 0) {
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circle(center[0],center[1],2);
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} else {
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circle(center[0],center[1],1);
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}
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rotate(center,1,-6,cx,cy);
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}
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}
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