images.c

This example shows how to use a background image for the screen and to load and display other bmp images, rotated and scaled. It has been used to create the fourth image of the documentation.

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

#include "mgsLib.h"


int main()
{
    int scr, imgSeagull, imgCrab;
    
    
    // Create a screen with a nice seaside background
    if ((scr = mgsCreateScreen(800, 600, "Using images", MGS_CWHITE, "seaside.bmp")) < 0)
        exit(EXIT_FAILURE);
    
    // Load the image of a seagull. Show an error if anything goes wrong
    if ((imgSeagull = mgsLoadImage("seagull.bmp")) < 0)
        mgsShowError(imgSeagull, "Error loading seagull image", MGS_EFWIN);
    // Load now the image of a crab. Show an error if anything goes wrong
    if ((imgCrab = mgsLoadImage("crab.bmp")) < 0)
        mgsShowError(imgCrab, "Error loading crab image", MGS_EFWIN);
    
    // Show the original seagull images, with and without background, near the right upper corner
    mgsDisplayImage(scr, imgSeagull, 10, 10, 0);
    mgsDisplayImage(scr, imgSeagull, 10, 100, 1);
    
    // Place two rotated, big seagulls with the sky as background
    mgsDisplayRotatedImage(scr, imgSeagull, 220, 102, 1.3, 1.3, -10, 1);
    mgsDisplayRotatedImage(scr, imgSeagull, 480, 180, 1.2, 1.2, 45, 1);
    
    // Place two more rotated seagulls on the sky
    mgsDisplayRotatedImage(scr, imgSeagull, 250, 50, 1.0, 1.0, 30, 1);
    mgsDisplayRotatedImage(scr, imgSeagull, 400, 80, 1.0, 1.0, -5, 1);
    
    // End with two more small rotated seagulls to end the flock
    mgsDisplayRotatedImage(scr, imgSeagull, 650, 30, 0.7, 0.7, -45, 1);
    mgsDisplayRotatedImage(scr, imgSeagull, 460, 60, 0.7, 0.7, 60, 1);
    
    // Show the original crab images, with and without background, near the right lower corner 
    mgsDisplayImage(scr, imgCrab, 10, 500, 0);
    mgsDisplayImage(scr, imgCrab, 10, 420, 1);
    
    // And place some crabs to feed the gulls
    mgsDisplayRotatedImage(scr, imgCrab, 460, 360, 0.5, 0.5, 0, 1);
    mgsDisplayRotatedImage(scr, imgCrab, 420, 340, 0.2, 0.2, 0, 1);
    mgsDisplayRotatedImage(scr, imgCrab, 310, 350, 0.4, 0.4, 5, 1);
    
    // Show the created image
    mgsUpdateScreen(scr);
    
    // Wait for S to be pressed
    puts("Press S to exit");
    while(!mgsKeyPressed('S'));

    
}