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POContinuous Line On Mouse Drag
 

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  1. POContinuous Line On Mouse Drag
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    <p>I am making a basic OpenGl program which is my weekend project.<br/> <strong>Description:</strong> <em>If I drag the mouse on the window screen then after I release the button(left) a line should appear that shows the path of dragging the mouse and a circle should traverse that line from start to end.</em><br/> My Code Works Very Well but the problem is that the line drawn is not continuous[rather its dashed] and it may be because of the mapping of OS screen to OpenGL screen. SO is there any way to make a continous line path or correct me If I am doing something wrong<br/><strong>Here is my code:</strong><br/></p> <pre><code>#include &lt;iostream&gt; #include &lt;glut.h&gt; #include &lt;string.h&gt; #define WIDTH 600 #define HEIGHT 600 using namespace std; double arr[5000][4]; int z=0; int flag=0; float radius=0.03; int ptr=0; int faltu_bit=1; float color[3][3]={{1.0,1.0,1.0},{1.0,1.0,0.0},{0.0,1.0,0.0}}; void drawText(char *str,float x,float y,int id) { int i; int len=strlen(str); //glLoadIdentity(); glColor3f(color[id][0],color[id][1],color[id][2]); glRasterPos2f(x,y); for(i=0;i&lt;len;i++) glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24,str[i]); } void init() { glClearColor( 0.0, 0.0, 0.0, 1.0); glMatrixMode( GL_PROJECTION); gluOrtho2D(0.0,WIDTH,0.0,HEIGHT); memset(arr,0,5000); glPointSize(20.0); } void resetAll() { memset(arr,0,5000); z=0; } ///OPENGL MAPPING/// float getOpenGLX(int x) { double ox = x/ (double)WIDTH*(WIDTH); return ox; } float getOpenGLY(int y) { double oy = (1 - y/ (double) HEIGHT)*HEIGHT; return oy; } void drawPoints() { glBegin( GL_POINTS ); glColor3f( 0.0,1.0,0.0 ); for ( int i = 0; i &lt; z; i++ ) { glVertex2f( arr[i][0],arr[i][1]); } glEnd(); } void drawBall(float x,float y) { glBegin( GL_POINTS); glColor3f( 1.0,1.0,0.0 ); glVertex2f(x,y); glEnd(); } void drawLines() { glBegin(GL_LINES); glColor3f(1.0,0.0,0.0); for(int i=0;i&lt;z;i++) { glVertex2f(arr[i][0],arr[i][1]); } glEnd(); } void addValue(int x,int y) { arr[z][0]=getOpenGLX(x); arr[z++][1]=getOpenGLY(y); } void trackBall() { drawPoints(); } void myDisplay() { glClear( GL_COLOR_BUFFER_BIT); if(!flag) { drawLines(); if(!faltu_bit) drawBall(arr[ptr][0],arr[ptr][1]); } if(faltu_bit) { drawText("Project by: Adil Ansar [10 CSS-32]",50.0,500.0,0); drawText("Welcome",250.0,300.0,1); drawText("Drag the Mouse Any Where in the Window to see the Path",10.0,200.0,2); } glutSwapBuffers(); glutPostRedisplay(); glFlush(); } void myMouseStat(int button,int state,int x, int y) { if(button==GLUT_LEFT_BUTTON &amp;&amp; state==GLUT_DOWN) { if(!flag) { if(faltu_bit) { faltu_bit=0; } resetAll(); flag=1; } } else if(button==GLUT_LEFT_BUTTON &amp;&amp; state==GLUT_UP) { if(flag) { ptr=0; flag=0; } } } void myPressedMove(int x,int y) { if(flag) { addValue(x,y); } } void myTimer(int t) { if(ptr!=z) { ptr++; } else { ptr=0; } glutTimerFunc(100,myTimer,0); } int main( int argc, char ** argv) { glutInit( &amp;argc, argv); glutInitDisplayMode( GLUT_DOUBLE| GLUT_RGB); glutInitWindowPosition( 100, 100); glutInitWindowSize(WIDTH,HEIGHT); glutCreateWindow( "Testing"); init(); glutDisplayFunc(myDisplay); glutMouseFunc(myMouseStat); glutMotionFunc(myPressedMove); glutTimerFunc(100,myTimer,0); glutMainLoop(); return 0; } </code></pre> <p><br/></p> <p><strong>This Is What I get:</strong><br/></p> <p><img src="https://i.stack.imgur.com/D5Ykq.png" alt="My code output"></p>
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