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Article contents:== Outdated egg! This is an egg for CHICKEN 3, the unsupported old release. You're almost certainly looking for [[/eggref/4/ezxdisp|the CHICKEN 4 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-4.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == ezxdisp [[toc:]] === Description A simple graphics library for X11. === Author n-sibata and Morihiko Tamai, packaged for CHICKEN by [[/users/felix winkelmann|felix winkelmann]]. === Requirements Requires the [[easyffi]] egg. === Download [[http://code.call-cc.org/legacy-eggs/3/ezxdisp.egg|ezxdisp.egg]] === Documentation ezxdisp is a simple graphics library for 2D/3D graphical applications. (The official distribution can be found [[http://mimi.aist-nara.ac.jp/~morihi-t/ezxdisp|here]]). ==== Initialize/Finalize a window <procedure>(ezx-init SIZE_X SIZE_Y WINDOW_NAME)</procedure> This procedure returns a {{EZX}} object all other procedures accept. <procedure>(ezx-quit EZX)</procedure> ==== Update the graphics in the window <procedure>(ezx-redraw EZX)</procedure> ==== Erase the graphics in the window/layer <procedure>(ezx-wipe EZX)</procedure> <procedure>(ezx-wipe-layer EZX LAYER)</procedure> {{LAYER}} should be an exact integer between 0 and 8. ==== Get the pointer coordinates <procedure>(ezx-sensebutton EZX)</procedure> Returns the current pointer coordinates as three values: {{BUTTON}}, {{X}} and {{Y}} <procedure>(ezx-pushbutton EZX)</procedure> Block until an event is received. Returns three values: {{BUTTON}}, {{X}} and {{Y}} The BUTTON result is 1, 2 or 3 for the first, second and third mouse button, respectively. The button number is additionally bitwise OR'd with 8 if the shift key is pressed and with 16 if the control key is pressed. ==== Draw 2D graphics <procedure>(ezx-line-2d EZX X0 Y0 X1 Y1 COLOR WIDTH)</procedure> <procedure>(ezx-circle-2d EZX X0 Y0 R COLOR WIDTH)</procedure> <procedure>(ezx-fillcircle-2d EZX X0 Y0 R COLOR WIDTH)</procedure> <procedure>(ezx-str-2d EZX X0 Y0 STRING COLOR)</procedure> <procedure>(ezx-fillrect-2d EZX X0 Y0 X1 Y1 COLOR)</procedure> ==== Draw 3D graphics <procedure>(ezx-set-light-3d EZX EX EY EZ)</procedure> <procedure>(ezx-set-view-3d EZX EX EY EZ VX VY VZ M)</procedure> <procedure>(ezx-c3d-to-2d EZX SX SY SZ)</procedure> Returns two values, {{DX}} and {{DY}}. <procedure>(ezx-line-3d EZX X0 Y0 Z0 X1 Y1 Z1 COLOR WIDTH)</procedure> <procedure>(ezx-str-3d EZX X0 Y0 Z0 STRING COLOR WIDTH)</procedure> <procedure>(ezx-poly-3d EZX POINTS HX HY HZ N COLOR)</procedure> <procedure>(ezx-circle-3d EZX X0 Y0 Z0 R COLOR)</procedure> The {{POINTS}} argument should be a SRFI-4 {{f64vector}} containing X, Y and Z coordinates. ==== Miscellaneous functions <procedure>(ezx-select-layer EZX LAYER)</procedure> Focuses on the layer. <procedure>(ezx-raise-window EZX)</procedure> Raises the window. <procedure>(ezx-window-name EZX STRING)</procedure> Sets a name of the window. <procedure>(ezx-set-background EZX COLOR)</procedure> Sets the background color of the window. ==== Colors <procedure>(make-ezx-color R G B)</procedure> This procedure returns a "color object", which is internally encoded as a {{f64vector}}. The red, green and blue components should be between 0 and 1. === Examples <enscript highlight="scheme"> (define ezx (ezx-init 100 100 "Hello, ezxdisp")) (ezx-set-background ezx (make-ezx-color 1 1 1)) (ezx-fillcircle-2d ezx 50 50 25 (make-ezx-color 1 0 0) 1) (ezx-redraw ezx) (let loop () (let-values ([(b _ _) (ezx-pushbutton ezx)]) (when (zero? b) (loop)) ) ) (ezx-quit ezx) </enscript> A more elaborate example is in the egg distribution in a file named {{3d_clock.scm}}, which displays an animated 3D-clock. === Changelog * 1.3 Added {{ezx-event-pending}} * 1.2 Adapted to externalized {{easyffi}} extension * 1.1 {{ezx-set-background}} wasn't documented * 1.0 Initial release === License This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Description of your changes:

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