Demo 23 of 35 in category NeHe
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# Lesson25.tcl
#
# Piotr Cieslak & NeHe's Morphing Points Tutorial
#
# This Code Was Created By Pet & Commented/Cleaned Up By Jeff Molofee
# If You've Found This Code Useful, Please Let Me Know.
# Visit NeHe Productions At http://nehe.gamedev.net
#
# Modified for Tcl3D by Paul Obermeier 2007/03/03
# See www.tcl3d.org for the Tcl3D extension.
package require tcl3d
# Font to be used in the Tk listbox.
set gDemo(listFont) {-family {Courier} -size 10}
# Determine the directory of this script.
set gDemo(scriptDir) [file dirname [info script]]
# Display mode.
set gDemo(fullScreen) true
# Window size.
set gDemo(winWidth) 640
set gDemo(winHeight) 480
set gDemo(xrot) 0.0 ; # X Rotation
set gDemo(yrot) 0.0 ; # Y Rotation
set gDemo(zrot) 0.0 ; # Z Rotation
set gDemo(xspeed) 0.1 ; # X Spin Speed
set gDemo(yspeed) 0.1 ; # Y Spin Speed
set gDemo(zspeed) 0.0 ; # Z Spin Speed
set gDemo(cx) 0.0 ; # X Position
set gDemo(cy) 0.0 ; # Y Position
set gDemo(cz) -15.0 ; # Z Position
set gDemo(key) 1 ; # Used To Make Sure Same Morph Key Is Not Pressed
set gDemo(step) 0 ; # Step Counter
set gDemo(steps) 200 ; # Maximum Number Of Steps
set gDemo(morph) false ; # Default morph To False (Not Morphing)
set gDemo(maxver) 0 ; # Will Eventually Hold The Maximum Number Of Vertices
# Show errors occuring in the Togl callbacks.
proc bgerror { msg } {
tk_messageBox -icon error -type ok -message "Error: $msg\n\n$::errorInfo"
ExitProg
}
# Print info message into widget a the bottom of the window.
proc PrintInfo { msg } {
if { [winfo exists .fr.info] } {
.fr.info configure -text $msg
}
}
proc SetFullScreenMode { win } {
set sh [winfo screenheight $win]
set sw [winfo screenwidth $win]
wm minsize $win $sw $sh
wm maxsize $win $sw $sh
set fmtStr [format "%dx%d+0+0" $sw $sh]
wm geometry $win $fmtStr
wm overrideredirect $win 1
focus -force $win
}
proc SetWindowMode { win w h } {
set sh [winfo screenheight $win]
set sw [winfo screenwidth $win]
wm minsize $win 10 10
wm maxsize $win $sw $sh
set fmtStr [format "%dx%d+0+25" $w $h]
wm geometry $win $fmtStr
wm overrideredirect $win 0
focus -force $win
}
# Toggle between windowing and fullscreen mode.
proc ToggleWindowMode {} {
if { $::gDemo(fullScreen) } {
SetFullScreenMode .
set ::gDemo(fullScreen) false
} else {
SetWindowMode . $::gDemo(winWidth) $::gDemo(winHeight)
set ::gDemo(fullScreen) true
}
}
proc Reset {} {
global gDemo
set gDemo(xrot) 0.0
set gDemo(yrot) 0.0
set gDemo(zrot) 0.0
set gDemo(xspeed) 0.0
set gDemo(yspeed) 0.0
set gDemo(zspeed) 0.0
set gDemo(cx) 0.0
set gDemo(cy) 0.0
set gDemo(cz) -15.0
.fr.toglwin postredisplay
}
# Set z speed.
proc SetZSpeed { val } {
set ::gDemo(zspeed) [expr {$::gDemo(zspeed) + $val}]
.fr.toglwin postredisplay
}
# Set y speed.
proc SetYSpeed { val } {
set ::gDemo(yspeed) [expr {$::gDemo(yspeed) + $val}]
.fr.toglwin postredisplay
}
# Set x speed.
proc SetXSpeed { val } {
set ::gDemo(xspeed) [expr {$::gDemo(xspeed) + $val}]
.fr.toglwin postredisplay
}
# Set z position.
proc SetZPos { val } {
set ::gDemo(cz) [expr {$::gDemo(cz) + $val}]
.fr.toglwin postredisplay
}
# Set y position.
proc SetYPos { val } {
set ::gDemo(cy) [expr {$::gDemo(cy) + $val}]
.fr.toglwin postredisplay
}
# Set x position.
proc SetXPos { val } {
set ::gDemo(cx) [expr {$::gDemo(cx) + $val}]
.fr.toglwin postredisplay
}
# Switch between morphing algorithms.
proc SwitchMorph { key } {
global gDemo
if { $key == 1 && $gDemo(key) != 1 && !$gDemo(morph) } {
set gDemo(key) 1
set gDemo(morph) true
set gDemo(dest) 1
}
if { $key == 2 && $gDemo(key) != 2 && !$gDemo(morph) } {
set gDemo(key) 2
set gDemo(morph) true
set gDemo(dest) 2
}
if { $key == 3 && $gDemo(key) != 3 && !$gDemo(morph) } {
set gDemo(key) 3
set gDemo(morph) true
set gDemo(dest) 3
}
if { $key == 4 && $gDemo(key) != 4 && !$gDemo(morph) } {
set gDemo(key) 4
set gDemo(morph) true
set gDemo(dest) 4
}
}
proc readstr { fp } {
while { 1 } {
gets $fp line
# Empty line or comment: Read next line
if { ($line eq "") || ([string index $line 0] eq "/") } {
continue
} else {
break
}
}
return $line
}
# Loads Object Number k From File (name)
proc objload {name k } {
global gObjects gDemo
set fileName [file join $::gDemo(scriptDir) "Data" $name]
set filein [open $fileName r]
set oneline [readstr $filein]
scan $oneline "Vertices: %d" ver
set gObjects($k,verts) $ver
for { set i 0 } { $i < $ver } { incr i } {
set oneline [readstr $filein]
scan $oneline "%f %f %f" rx ry rz
lappend gObjects($k,points) [list $rx $ry $rz]
}
close $filein
# Keeps Track Of Highest Number Of Vertices Used In Any Of The Objects
if { $ver > $gDemo(maxver) } {
set gDemo(maxver) $ver
}
}
# Calculates Movement Of Points During Morphing
# This Makes Points Move At A Speed So They All Get To Their
# Destination At The Same Time
proc calculate { i sour dest } {
global gObjects gDemo
set sourPoint [lindex $gObjects($sour,points) $i]
set destPoint [lindex $gObjects($dest,points) $i]
set x [expr {([lindex $sourPoint 0] - [lindex $destPoint 0]) / $gDemo(steps)}]
set y [expr {([lindex $sourPoint 1] - [lindex $destPoint 1]) / $gDemo(steps)}]
set z [expr {([lindex $sourPoint 2] - [lindex $destPoint 2]) / $gDemo(steps)}]
return [list $x $y $z]
}
# Resize And Initialize The GL Window
proc ReshapeCallback { toglwin { w -1 } { h -1 } } {
set w [$toglwin width]
set h [$toglwin height]
glViewport 0 0 $w $h ; # Reset The Current Viewport
glMatrixMode GL_PROJECTION ; # Select The Projection Matrix
glLoadIdentity ; # Reset The Projection Matrix
# Calculate The Aspect Ratio Of The Window
gluPerspective 45.0 [expr double($w)/double($h)] 0.1 100.0
glMatrixMode GL_MODELVIEW ; # Select The Modelview Matrix
glLoadIdentity ; # Reset The Modelview Matrix
set ::gDemo(winWidth) $w
set ::gDemo(winHeight) $h
}
# All Setup For OpenGL Goes Here
proc CreateCallback { toglwin } {
global gObjects gDemo
glBlendFunc GL_SRC_ALPHA GL_ONE ; # Set The Blending Function For Translucency
glClearColor 0.0 0.0 0.0 0.0 ; # This Will Clear The Background Color To Black
glClearDepth 1.0 ; # Enables Clearing Of The Depth Buffer
glDepthFunc GL_LESS ; # The Type Of Depth Test To Do
glEnable GL_DEPTH_TEST ; # Enables Depth Testing
glShadeModel GL_SMOOTH ; # Enables Smooth Color Shading
glHint GL_PERSPECTIVE_CORRECTION_HINT GL_NICEST ; # Really Nice Perspective Calculations
set gDemo(maxver) 0 ; # Sets Max Vertices To 0 By Default
objload "Sphere.txt" 1 ; # Load First Object Into List gObjects(1,points)
objload "Torus.txt" 2 ; # Load Second Object Into List gObjects(2,points)
objload "Tube.txt" 3 ; # Load Third Object Into List gObjects(3,points)
# Fourth Object Gets Random Values
for { set i 0 } { $i < 486 } { incr i } {
set x [expr (int(14000*rand())/1000)-7] ; # Random Float Value From -7 to 7
set y [expr (int(14000*rand())/1000)-7] ; # Random Float Value From -7 to 7
set z [expr (int(14000*rand())/1000)-7] ; # Random Float Value From -7 to 7
lappend gObjects(4,points) [list $x $y $z]
}
# Load sphere.txt Object Into Helper (Used As Starting Point)
objload "Sphere.txt" "helper"
# Source & Destination Are Set To Equal First Object
set gDemo(sour) 1
set gDemo(dest) 1
}
proc Animate {} {
.fr.toglwin postredisplay
set ::animateId [tcl3dAfterIdle Animate]
}
proc StartAnimation {} {
if { ! [info exists ::animateId] } {
Animate
}
}
proc StopAnimation {} {
if { [info exists ::animateId] } {
after cancel $::animateId
unset ::animateId
}
}
# Here's Where We Do All The Drawing
proc DisplayCallback { toglwin } {
global gObjects gDemo
# Clear Screen And Depth Buffer
glClear [expr $::GL_COLOR_BUFFER_BIT | $::GL_DEPTH_BUFFER_BIT]
# Viewport command is not really needed, but has been inserted for
# Mac OSX. Presentation framework (Tk) does not send a reshape event,
# when switching from one demo to another.
glViewport 0 0 [$toglwin width] [$toglwin height]
glLoadIdentity
glTranslatef $gDemo(cx) $gDemo(cy) $gDemo(cz)
glRotatef $gDemo(xrot) 1 0 0
glRotatef $gDemo(yrot) 0 1 0
glRotatef $gDemo(zrot) 0 0 1
if { [info exists ::animateId] } {
# Increase xrot,yrot & zrot by xspeed, yspeed & zspeed
set gDemo(xrot) [expr {$gDemo(xrot) + $gDemo(xspeed)}]
set gDemo(yrot) [expr {$gDemo(yrot) + $gDemo(yspeed)}]
set gDemo(zrot) [expr {$gDemo(zrot) + $gDemo(zspeed)}]
}
glBegin GL_POINTS
for { set i 0 } { $i < $gObjects(1,verts) } { incr i } {
# Loop Through All The Verts Of morph1 (All Objects Have
# The Same Amount Of Verts For Simplicity, Could Use maxver Also)
# If morph Is True Calculate Movement Otherwise Movement=0
if { $gDemo(morph) } {
set q [calculate $i $gDemo(sour) $gDemo(dest)]
} else {
set q [list 0.0 0.0 0.0]
}
set helpTmp [lindex $gObjects(helper,points) $i]
set tx [expr {[lindex $helpTmp 0] - [lindex $q 0]}]
set ty [expr {[lindex $helpTmp 1] - [lindex $q 1]}]
set tz [expr {[lindex $helpTmp 2] - [lindex $q 2]}]
lset gObjects(helper,points) $i [list $tx $ty $tz]
glColor3f 0 1 1 ; # Set Color To A Bright Shade Of Off Blue
glVertex3f $tx $ty $tz ; # Draw A Point At The Current Temp Values (Vertex)
glColor3f 0 0.5 1 ; # Darken Color A Bit
# Calculate Two Positions Ahead
set tx [expr {$tx - 2* [lindex $q 0]}]
set ty [expr {$ty - 2* [lindex $q 1]}]
set ty [expr {$ty - 2* [lindex $q 1]}]
glVertex3f $tx $ty $tz ; # Draw A Second Point At The Newly Calculate Position
glColor3f 0 0 1 ; # Set Color To A Very Dark Blue
# Calculate Two More Positions Ahead
set tx [expr {$tx - 2* [lindex $q 0]}]
set ty [expr {$ty - 2* [lindex $q 1]}]
set ty [expr {$ty - 2* [lindex $q 1]}]
glVertex3f $tx $ty $tz ; # Draw A Third Point At The Second New Position
}
glEnd
# If We're Morphing And We Haven't Gone Through All 200 Steps Increase Our Step Counter
# Otherwise Set Morphing To False, Make Source=Destination And Set The Step Counter Back To Zero.
if { $gDemo(morph) && $gDemo(step) <= $gDemo(steps) } {
incr gDemo(step)
} else {
set gDemo(morph) false
set gDemo(sour) $gDemo(dest)
set gDemo(step) 0
}
$toglwin swapbuffers
}
proc Cleanup {} {
global gObjects gDemo
catch { unset gObjects }
catch { unset gDemo }
}
# Put all exit related code here.
proc ExitProg {} {
exit
}
# Create the OpenGL window and some Tk helper widgets.
proc CreateWindow {} {
frame .fr
pack .fr -expand 1 -fill both
# Create Our OpenGL Window
togl .fr.toglwin -width $::gDemo(winWidth) -height $::gDemo(winHeight) \
-double true -depth true \
-createcommand CreateCallback \
-reshapecommand ReshapeCallback \
-displaycommand DisplayCallback
listbox .fr.usage -font $::gDemo(listFont) -height 11
label .fr.info
grid .fr.toglwin -row 0 -column 0 -sticky news
grid .fr.usage -row 1 -column 0 -sticky news
grid .fr.info -row 2 -column 0 -sticky news
grid rowconfigure .fr 0 -weight 1
grid columnconfigure .fr 0 -weight 1
wm title . "Tcl3D demo: Piotr Cieslak & NeHe's Morphing Points Tutorial (Lesson 25)"
# Watch For ESC Key And Quit Messages
wm protocol . WM_DELETE_WINDOW "ExitProg"
bind . <Key-Escape> "ExitProg"
bind . <Key-F1> "ToggleWindowMode"
bind . <Key-Down> "SetXSpeed 0.01"
bind . <Key-Up> "SetXSpeed -0.01"
bind . <Key-Right> "SetYSpeed 0.01"
bind . <Key-Left> "SetYSpeed -0.01"
bind . <Key-Prior> "SetZSpeed 0.01"
bind . <Key-Next> "SetZSpeed -0.01"
bind . <Key-a> "SetXPos -0.1"
bind . <Key-d> "SetXPos 0.1"
bind . <Key-s> "SetYPos -0.1"
bind . <Key-w> "SetYPos 0.1"
bind . <Key-q> "SetZPos -0.1"
bind . <Key-z> "SetZPos 0.1"
bind . <Key-1> "SwitchMorph 1"
bind . <Key-2> "SwitchMorph 2"
bind . <Key-3> "SwitchMorph 3"
bind . <Key-4> "SwitchMorph 4"
bind . <Key-r> "Reset"
bind .fr.toglwin <1> "StartAnimation"
bind .fr.toglwin <2> "StopAnimation"
bind .fr.toglwin <3> "StopAnimation"
bind .fr.toglwin <Control-Button-1> "StopAnimation"
.fr.usage insert end "Key-Escape Exit"
.fr.usage insert end "Key-F1 Toggle window mode"
.fr.usage insert end "Key-Up|Down Decrease|Increase x speed"
.fr.usage insert end "Key-Left|Right Decrease|Increase y speed"
.fr.usage insert end "Key-Next|Prior Decrease|Increase z speed"
.fr.usage insert end "Key-a|d Decrease|Increase x position"
.fr.usage insert end "Key-s|w Decrease|Increase y position"
.fr.usage insert end "Key-q|z Decrease|Increase z position"
.fr.usage insert end "Key-1|2|3|4 Toggle morphs"
.fr.usage insert end "Key-r Reset position and rotation"
.fr.usage insert end "Mouse-L|MR Start|Stop animation"
.fr.usage configure -state disabled
}
CreateWindow
PrintInfo [tcl3dOglGetInfoString]
if { [file tail [info script]] eq [file tail $::argv0] } {
# If started directly from tclsh or wish, then start animation.
update
StartAnimation
}
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