figures.c

This example shows how to draw bordered and non bordered figures. Then it uses rotated figures in a simple animation. It has been used to generate the third image of the documentation.

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <math.h>

#include "mgsLib.h"

// Points to define the generic polygon (x and y coordinates for each point)
int points[] = {500, 300, 470, 250, 520, 255, 560, 280, 555, 320, 535, 345, 480, 340};

int main()
{
    int scr;
    int angles[5] = {0};
    
    
    // Create a screen
    if ((scr = mgsCreateScreen(800, 600, "Animating figures", 0xFFC0C0, NULL)) < 0)
        exit(EXIT_FAILURE);
    
    // Draw four figures near the corners
    // A bordered rectangle top left
    mgsBorderedRectangle(scr, 50, 50, 150, 130, MGS_CRED, 3, 0x202080);
    // A five points star top right
    mgsStarCR(scr, 5, 700, 90, 70, 30, MGS_CBLUE);
    // A regular heptagon bottom left
    mgsRegPolygonCR(scr, 7, 100, 510, 60, MGS_CBLUE);
    // A bordered ellipse bottom right
    mgsBorderedEllipse(scr, 700, 510, 40, 70, MGS_CRED, 3, 0x202080);
    // Finally the 7 sides polygon whose vertex are defined in the points vector
    mgsBorderedPolygon(scr, 7, points, 0x208020, 8, MGS_CBLACK);
    
    // Show the created image
    mgsUpdateScreen(scr);
    
    // Wait for A to be pressed
    puts("Press A to animate");
    while(!mgsKeyPressed('A'));
    
    // And animate until S is pressed
    puts("Press S to exit");
    while(!mgsKeyPressed('S')) {
        // We update the angles. The rectangle and ellipse will rotate counterclockwise 
        // around their respective centers; the star and regular polygon clockwise.
        angles[0] += 2;
        angles[1] -= 2;
        angles[2] -= 2;
        angles[3] += 2;
        // And the generic polygon slower, counterclockwise and around the center of the screen
        angles[4] += 1;
        
        // Clear the previous screen
        mgsClearScreen(scr);
        
        // Draw the rotated figures
        mgsRotatedBorderedRectangle(scr, 50, 50, 150, 130, angles[0], MGS_CRED, 3, 0x202080);
        mgsRotatedStarCR(scr, 5, 700, 90, 70, 30, angles[1], MGS_CBLUE);
        mgsRotatedRegPolygonCR(scr, 7, 100, 510, 60, angles[2], MGS_CBLUE);
        mgsRotatedBorderedEllipse(scr, 700, 510, 40, 70, angles[3], MGS_CRED, 3, 0x202080);
        mgsRotatedBorderedPolygon(scr, 7, points, 400, 300, angles[4], 0x208020, 8, MGS_CBLACK);
        
        // Wait until the frame time expires
        mgsWaitFrame();
        // And show the new image frame
        mgsUpdateScreen(scr);
        
        
    }
}