diff options
Diffstat (limited to 'Smoke/seedpoint.c')
| -rw-r--r-- | Smoke/seedpoint.c | 70 |
1 files changed, 64 insertions, 6 deletions
diff --git a/Smoke/seedpoint.c b/Smoke/seedpoint.c index 4c07038..359bf03 100644 --- a/Smoke/seedpoint.c +++ b/Smoke/seedpoint.c @@ -16,13 +16,70 @@ struct point seedpoints[MAX_SEEDPOINTS];
int cur_seedpoint;
+static struct point2f hit_test(struct point2f mouse_coord)
+{
+ double l_ProjectionMatrix[16], l_ModelViewMatrix[16], l_PointNear[3], l_PointFar[3], l_dFactor;
+ int l_ViewPort[4];
+
+ struct point2f new_mouse, return_value;
+ new_mouse.x = mouse_coord.x;
+ new_mouse.y = mouse_coord.y;
+
+ //first setup the modelview matrix (assume the projection matrix is still valid/correct)
+ glMatrixMode(GL_MODELVIEW);
+
+ glPushMatrix();
+ glLoadIdentity();
+ glTranslatef(x_pos, y_pos, z_pos);
+ glScalef(z_pos, z_pos, z_pos);
+ glRotatef(x_rot, 1.0f, 0.0f, 0.0f);
+ glRotatef(y_rot, 0.0f, 1.0f, 0.0f);
+ glRotatef(z_rot, 0.0f, 0.0f, 1.0f);
+
+ //get the viewport, modelview and projection matrices' values
+ glGetIntegerv(GL_VIEWPORT, l_ViewPort);
+ glGetDoublev(GL_MODELVIEW_MATRIX, l_ModelViewMatrix);
+ glGetDoublev(GL_PROJECTION_MATRIX, l_ProjectionMatrix);
+
+ glPopMatrix();
+
+ //invert the mouse y coordinate
+ new_mouse.y = (winHeight - new_mouse.y);
+
+ //unproject the mouse coords to the object coordinates at the near clipping plane
+ gluUnProject((GLdouble) new_mouse.x, new_mouse.y, 0.0,
+ l_ModelViewMatrix, l_ProjectionMatrix, l_ViewPort,
+ &l_PointNear[0], &l_PointNear[1], &l_PointNear[2]);
+
+ //unproject the mouse coords to the object coordinates at the far clipping plane
+ gluUnProject((GLdouble) new_mouse.x, new_mouse.y, 1.0,
+ l_ModelViewMatrix, l_ProjectionMatrix, l_ViewPort,
+ &l_PointFar[0], &l_PointFar[1], &l_PointFar[2]);
+
+ //determine where the the vector (l_PointNear -> l_PointFar) intersects the plane z = 0,
+ //because we draw the data visualisation at z = 0, we get the coordinates
+ l_dFactor = -l_PointNear[2] / (l_PointFar[2] - l_PointNear[2]);
+
+ //return the x,y coordinates at the point where the vector intersects the z = 0 plane
+ return_value.x = l_PointNear[0] + (l_dFactor * (l_PointFar[0] - l_PointNear[0]));
+ return_value.y = l_PointNear[1] + (l_dFactor * (l_PointFar[1] - l_PointNear[1]));
+
+ return return_value;
+}
+
void create_seedpoint(float mx, float my)
{
+ struct point2f coords;
+
if (cur_seedpoint >= MAX_SEEDPOINTS) return;
- seedpoints[cur_seedpoint].x = mx;
- seedpoints[cur_seedpoint].y = my;
- seedpoints[cur_seedpoint].z = -725.0f;
+ coords.x = mx;
+ coords.y = my;
+ //coords = hit_test(coords);
+
+ seedpoints[cur_seedpoint].x = coords.x;
+ seedpoints[cur_seedpoint].y = coords.y;
+ seedpoints[cur_seedpoint].z = 0;
cur_seedpoint++;
} // create_seedpoint
@@ -58,6 +115,8 @@ void render_seedpoints(void) gluQuadricOrientation(qobj, GLU_INSIDE);
gluQuadricTexture(qobj, GL_TRUE);
+ glDisable(GL_BLEND);
+
glNewList(lid, GL_COMPILE);
gluSphere(qobj, 10.0f, 16, 16);
glEndList();
@@ -66,11 +125,10 @@ void render_seedpoints(void) {
float color_scale = (float)i/MAX_SEEDPOINTS;
- glColor3f(color_scale, 1.0f - color_scale, 0.0f);
+ glColor3f(color_scale, 1.0f - color_scale, 1.0f - color_scale);
glPushMatrix();
- glLoadIdentity();
- glTranslatef(seedpoints[i].x - (winWidth/2), -(seedpoints[i].y - (winHeight/2)), seedpoints[i].z);
+ glTranslatef(seedpoints[i].x, winHeight - seedpoints[i].y, seedpoints[i].z);
glCallList(lid);
glPopMatrix();
}
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