StackOverflow2013

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plurals

PO
primarykey
Id
20154687
data
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0
AnswerCount
0
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2013-11-22T21:19:57.820
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2013-11-22T21:19:57.820
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44729
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20154421
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2
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3
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text
Body
Don't swap the buffers in the middle. Just draw the selection box on the back-buffer like everything else: <a href="https://i.stack.imgur.com/TR8NG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TR8NG.png" alt="selection"></a> <pre><code>#include <GL/glut.h> int StartX = -1; int StartY = -1; int EndX = -1; int EndY = -1; void mouse( int button, int state, int x, int y ) { if( button == GLUT_LEFT && state == GLUT_DOWN ) { StartX = x; StartY = y; } if( button == GLUT_LEFT && state == GLUT_UP ) { StartX = -1; StartY = -1; EndX = -1; EndY = -1; } } void motion( int x, int y ) { EndX = x; EndY = y; glutPostRedisplay(); } void display() { double w = glutGet( GLUT_WINDOW_WIDTH ); double h = glutGet( GLUT_WINDOW_HEIGHT ); glClear( GL_COLOR_BUFFER_BIT ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); double ar = w / h; glOrtho( -2 * ar, 2 * ar, -2, 2, -1, 1 ); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); glBegin( GL_TRIANGLES ); glColor3ub( 255, 0, 0 ); glVertex2i( -1, -1 ); glColor3ub( 0, 255, 0 ); glVertex2i( 1, -1 ); glColor3ub( 0, 0, 255 ); glVertex2i( 0, 1 ); glEnd(); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); glOrtho( 0, w, h, 0, -1, 1 ); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); if( StartX > 0 && StartY > 0 && EndX > 0 && EndY > 0 ) { glLogicOp(GL_XOR); glEnable(GL_COLOR_LOGIC_OP); glColor3f(1.0, 1.0, 1.0); glLineWidth(3.0); glBegin(GL_LINE_LOOP); glVertex2i(StartX, StartY); glVertex2i(EndX, StartY); glVertex2i(EndX, EndY); glVertex2i(StartX, EndY); glEnd(); glDisable(GL_COLOR_LOGIC_OP); } glutSwapBuffers(); } int main( int argc, char **argv ) { glutInit( &argc, argv ); glutInitDisplayMode( GLUT_RGBA | GLUT_DOUBLE ); glutInitWindowSize( 640, 480 ); glutCreateWindow( "GLUT" ); glutDisplayFunc( display ); glutMouseFunc( mouse ); glutMotionFunc( motion ); glutMainLoop(); return 0; } </code></pre> Since you weren't specifying them I added projection and modelview matrices.
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singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POopengl rubberbanded box not showing
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USgenpfault
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PostLinksRelatedPostIdPostId
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PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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1. This table or related slice is empty.

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