Hi,
I am trying to bind an object to the PassiveMouseFunc
now I can get it to draw the shape. however when i move the mouse it creates a trail, I don't want a trail.
I am already using double buffering, is there a way to get rid of the trail?
This is what i am talking about
Thx
-Ti22-
The first thing to do in your drawing function is this:
Code:glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Do al the drawing and stuff
OK I did it, I put the thing in my passiveMotion callback but when i do this everything else (the flowers i draw appear for a sec and disappears.
Last edited by Ti22; 11-07-2004 at 01:23 PM.
-Ti22-
You need to call your drawing function every frame you want it to be drawn. If your doing that I dont know why it dissappears, then I need to see code.
I am using the line u gave me in the passivemotionfunc callback.Code:void mouseMotion (GLint x, GLint y) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); waterThingy(x-400, (-y)+250, 0.0, 1.0, 1.0, 1.0); glutSwapBuffers(); } void mainDisplay (GLvoid) { glMatrixMode(GL_MODELVIEW); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); world(); glLoadIdentity(); flower(500.0, 500.0, 0.0, 0.2, 0.2, 0.2); glLoadIdentity(); flower(1000.0, 500.0, 0.0, 0.2, 0.2, 0.2); glLoadIdentity(); drawBucket(1500.0, 500.0, 0.0, 0.2, 0.2, 0.2); glLoadIdentity(); flower(100.0, 0.0, 0.0, 1.0, 1.0, 1.0); glLoadIdentity(); drawBucket(-300, 0.0, 0.0, 1.0, 1.0, 1.0); glLoadIdentity(); flower(300.0, 0.0, 0.0, 1.0, 1.0, 1.0); glutSwapBuffers(); } void main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB); glutInitWindowSize(800, 600); glutCreateWindow("Flower and Pot"); InitGL(); glutReshapeFunc(resize); glutDisplayFunc(mainDisplay); glutKeyboardFunc(keyBoard); glutPassiveMotionFunc(mouseMotion); glutMainLoop(); }
-Ti22-
You should only clear the buffer once every frame, and only swap it once every frame. Also check out the FAQ or search the board why void main is bad.Code:void mouseMotion (GLint x, GLint y) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Get rid of this here waterThingy(x-400, (-y)+250, 0.0, 1.0, 1.0, 1.0); glutSwapBuffers(); // Get rid of this too }
Last edited by Shakti; 11-07-2004 at 01:40 PM.
if i get rid of those lines it the object i bind to the mouse won't show up. and I changed it to int main.
btw shakti(means power in hindi rite?), i really appreciate this. ur replying so fast.
Last edited by Ti22; 11-07-2004 at 01:47 PM.
-Ti22-
Ok do this instead, have two global variables that should be the place where you want to draw the waterthingy, then in your mainDisplay you draw that with those coordinates instead, something like
Try something along those lines. if waterThingy actaully draws something (as I suspect it does) you really really want it to be in the drawing function.Code:GLint waterX = 0; GLint waterY = 0; void mouseMotion (GLint x, GLint y) { waterX = x-400; waterY = (-y)+250; } void mainDisplay (GLvoid) { glMatrixMode(GL_MODELVIEW); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); world(); glLoadIdentity(); flower(500.0, 500.0, 0.0, 0.2, 0.2, 0.2); glLoadIdentity(); flower(1000.0, 500.0, 0.0, 0.2, 0.2, 0.2); glLoadIdentity(); drawBucket(1500.0, 500.0, 0.0, 0.2, 0.2, 0.2); glLoadIdentity(); flower(100.0, 0.0, 0.0, 1.0, 1.0, 1.0); glLoadIdentity(); drawBucket(-300, 0.0, 0.0, 1.0, 1.0, 1.0); glLoadIdentity(); flower(300.0, 0.0, 0.0, 1.0, 1.0, 1.0); waterThingy(waterX,waterY, 0.0, 1.0, 1.0, 1.0); glutSwapBuffers(); }
ok i did that but now the Watering Can gets fixed it one position it doesn't move with the mouse.
Don't I have to return waterX and waterY to Global Variable ?
Last edited by Ti22; 11-07-2004 at 01:59 PM.
-Ti22-
Code:void mouseMotion (GLint x, GLint y) { waterX = x-400; waterY = (-y)+250; glutPostRedisplay(); }
WOW its Works !!! thx alot guys, really appreciate this.
Hugs and Kisses
Last edited by Ti22; 11-07-2004 at 02:02 PM.
-Ti22-
