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POHow to make simple paint app using opengl/glut using c++ on xcode
 

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  1. POHow to make simple paint app using opengl/glut using c++ on xcode
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    <p>So fare i am able to register mouse events. the only problem i am having is how to get the drawing to the screen. I have posted bellow the code that i am using currently. all it does is draw a window and some colored lines. i would idealy like a way to just draw to the screen and not have the screen completely clear every time i call the draw function.</p> <pre><code>void myInit(void) { glClearColor(1.0,1.0,1.0,0.0); // set white background color glColor3f(0.0f, 0.0f, 0.0f); // set the drawing color glPointSize(4.0); // a ‘dot’ is 4 by 4 pixels glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, 640.0, 0.0, 480.0); } void myDisplay(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the screen //First Line glLineWidth(8.0f); glBegin(GL_LINE_STRIP); glColor3ub(255, 0, 0); glVertex2i(40, 380); glColor3ub(0, 255, 0); glVertex2i(600, 380); glEnd(); //Second Line glLineWidth(8.0f); glBegin(GL_LINE_STRIP); glColor3ub(0, 0, 255); glVertex2i(40, 250); glColor3ub(0, 255, 0); glVertex2i(600, 250); glEnd(); //Third Line glLineWidth(8.0f); glBegin(GL_LINE_STRIP); glColor3ub(255, 0, 0); glVertex2i(40, 120); glColor3ub(0, 0, 255); glVertex2i(600, 120); glEnd(); glFlush(); // send all output to display } int main(int argc, char** argv) { //GLUT &amp; OpenGL glutInit(&amp;argc, argv); // initialize the toolkit glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); // set display mode glutInitWindowSize(640,480); // set window size glutInitWindowPosition(100, 150); // set window position on screen glutCreateWindow("my first attempt"); // open the screen window glutDisplayFunc(myDisplay); // register redraw function myInit(); glutMainLoop(); // go into a perpetual loop } </code></pre>
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    1. USlufthansa747
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    1. COi dont know what to try :P
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