;------------------------------------------------------------------------------
; C callable functions
- .global _tgi_load
- .global _tgi_load_driver
- .global _tgi_unload
- .global _tgi_install
- .global _tgi_uninstall
- .global _tgi_init
- .global _tgi_ioctl
+ .global _tgi_arc
+ .global _tgi_bar
+ .global _tgi_circle
+ .global _tgi_clear
.global _tgi_done
+ .global _tgi_ellipse
+ .global _tgi_getcolor
+ .global _tgi_getcolorcount
+ .global _tgi_getdefpalette
.global _tgi_geterror
.global _tgi_geterrormsg
- .global _tgi_clear
- .global _tgi_getpagecount
- .global _tgi_setviewpage
- .global _tgi_setdrawpage
- .global _tgi_getcolorcount
.global _tgi_getmaxcolor
- .global _tgi_setcolor
- .global _tgi_getcolor
- .global _tgi_setpalette
- .global _tgi_getpalette
- .global _tgi_getdefpalette
- .global _tgi_getxres
.global _tgi_getmaxx
- .global _tgi_getyres
.global _tgi_getmaxy
+ .global _tgi_getpagecount
+ .global _tgi_getpalette
.global _tgi_getpixel
- .global _tgi_setpixel
+ .global _tgi_getxres
+ .global _tgi_getyres
.global _tgi_gotoxy
+ .global _tgi_init
+ .global _tgi_install
+ .global _tgi_ioctl
.global _tgi_line
.global _tgi_lineto
- .global _tgi_circle
- .global _tgi_ellipse
- .global _tgi_bar
+ .global _tgi_load
+ .global _tgi_load_driver
+ .global _tgi_outtext
+ .global _tgi_outtextxy
+ .global _tgi_setcolor
+ .global _tgi_setdrawpage
+ .global _tgi_setpalette
+ .global _tgi_setpixel
+ .global _tgi_setviewpage
+ .global _tgi_textheight
.global _tgi_textscale
.global _tgi_textstyle
.global _tgi_textwidth
- .global _tgi_textheight
- .global _tgi_outtext
- .global _tgi_outtextxy
-
-
+ .global _tgi_uninstall
+ .global _tgi_unload
<sect1><tt/tgi.h/<label id="tgi.h"><p>
<itemize>
+<item><ref id="tgi_arc" name="tgi_arc">
<item><ref id="tgi_bar" name="tgi_bar">
<item><ref id="tgi_circle" name="tgi_circle">
<item><ref id="tgi_clear" name="tgi_clear">
</quote>
+<sect1>tgi_arc<label id="tgi_arc"><p>
+
+<quote>
+<descrip>
+<tag/Function/Draw an elliptic arc in the current color.
+<tag/Header/<tt/<ref id="tgi.h" name="tgi.h">/
+<tag/Declaration/<tt/void __fastcall__ tgi_arc (int x, int y,
+unsigned char rx, unsigned char ry, unsigned sa, unsigned ea);/
+<tag/Description/The function draws an elliptic arc with center at x/y and
+radii rx/ry using the current drawing color. The arc covers the angle
+between sa and ea (startangle and endangle), which must be in the range
+0..360.
+<tag/Limits/<itemize>
+<item>The function is only available as fastcall function, so it may only
+be used in presence of a prototype.
+<item>The function behaves unexpectedly or may crash if the angles are out
+of range.
+</itemize>
+<tag/Availability/cc65
+<tag/See also/
+<ref id="tgi_bar" name="tgi_bar">,
+<ref id="tgi_circle" name="tgi_circle">,
+<ref id="tgi_ellipse" name="tgi_ellipse">,
+<ref id="tgi_setcolor" name="tgi_setcolor">
+<tag/Example/<verb>
+/* Draw the upper half of an ellipse */
+tgi_setcolor(TGI_COLOR_BLUE);
+tgi_arc (50, 50, 40, 20, 0, 180);
+</verb>
+</descrip>
+</quote>
+
+
<sect1>tgi_bar<label id="tgi_bar"><p>
<quote>
</itemize>
<tag/Availability/cc65
<tag/See also/
+<ref id="tgi_arc" name="tgi_arc">,
<ref id="tgi_bar" name="tgi_bar">,
<ref id="tgi_ellipse" name="tgi_ellipse">,
<ref id="tgi_setcolor" name="tgi_setcolor">
</itemize>
<tag/Availability/cc65
<tag/See also/
+<ref id="tgi_arc" name="tgi_arc">,
<ref id="tgi_bar" name="tgi_bar">,
<ref id="tgi_circle" name="tgi_circle">,
<ref id="tgi_setcolor" name="tgi_setcolor">
<tag/Header/<tt/<ref id="tgi.h" name="tgi.h">/
<tag/Declaration/<tt/const unsigned char* __fastcall__ tgi_getdefpalette (void);/
<tag/Description/The tgi driver has a default palette that is active at startup.
-The named colors TGI_COLOR_BLACK, TGI_COLOR_WHITE, TGI_COLOR_RED... need this
+The named colors TGI_COLOR_BLACK, TGI_COLOR_WHITE, TGI_COLOR_RED... need this
palette to work correctly.
<tag/Limits/<itemize>
<item>The function is only available as fastcall function, so it may only
#--------------------------------------------------------------------------
# Object files
-C_OBJS = tgi_ellipse.o \
+C_OBJS = tgi_arc.o \
tgi_load.o \
tgi_load_driver.o \
tgi_load_vectorfont.o
tgi_clipline.o \
tgi_curtoxy.o \
tgi_done.o \
+ tgi_ellipse.o \
tgi_free_vectorfont.o \
tgi_getcolor.o \
tgi_getcolorcount.o \
--- /dev/null
+/*****************************************************************************/
+/* */
+/* tgi_arc.c */
+/* */
+/* Draw an ellipse arc */
+/* */
+/* */
+/* */
+/* (C) 2002-2009, Ullrich von Bassewitz */
+/* Roemerstrasse 52 */
+/* D-70794 Filderstadt */
+/* EMail: uz@cc65.org */
+/* */
+/* */
+/* This software is provided 'as-is', without any expressed or implied */
+/* warranty. In no event will the authors be held liable for any damages */
+/* arising from the use of this software. */
+/* */
+/* Permission is granted to anyone to use this software for any purpose, */
+/* including commercial applications, and to alter it and redistribute it */
+/* freely, subject to the following restrictions: */
+/* */
+/* 1. The origin of this software must not be misrepresented; you must not */
+/* claim that you wrote the original software. If you use this software */
+/* in a product, an acknowledgment in the product documentation would be */
+/* appreciated but is not required. */
+/* 2. Altered source versions must be plainly marked as such, and must not */
+/* be misrepresented as being the original software. */
+/* 3. This notice may not be removed or altered from any source */
+/* distribution. */
+/* */
+/*****************************************************************************/
+
+
+
+#include <tgi.h>
+#include <cc65.h>
+
+
+
+/*****************************************************************************/
+/* Code */
+/*****************************************************************************/
+
+
+
+static int RoundMul (int rhs, int lhs)
+{
+ long res = cc65_imul16x16r32 (rhs, lhs);
+ if ((unsigned char)res & 0x80) {
+ return (int)(res >> 8) + 1;
+ } else {
+ return (int)(res >> 8);
+ }
+}
+
+
+
+void __fastcall__ tgi_arc (int x, int y, unsigned char rx, unsigned char ry,
+ unsigned sa, unsigned ea)
+/* Draw an ellipse arc with center at x/y and radii rx/ry using the current
+ * drawing color. The arc covers the angle between sa and ea (startangle and
+ * endangle), which must be in the range 0..360 (otherwise the function may
+ * bevave unextectedly).
+ */
+{
+ int x1, y1, x2, y2;
+ unsigned char inc;
+ unsigned char done = 0;
+
+ /* Bail out if there's nothing to do */
+ if (sa > ea) {
+ return;
+ }
+
+ /* Determine the number of segments to use. This may be refined ... */
+ if (rx + ry >= 25) {
+ inc = 12;
+ } else {
+ inc = 24;
+ }
+
+ /* Calculate the start coords */
+ x1 = x + RoundMul (rx, cc65_cos (sa));
+ y1 = y + RoundMul (ry, cc65_sin (sa));
+ do {
+ sa += inc;
+ if (sa >= ea) {
+ sa = ea;
+ done = 1;
+ }
+ x2 = x + RoundMul (rx, cc65_cos (sa));
+ y2 = y - RoundMul (ry, cc65_sin (sa));
+ tgi_line (x1, y1, x2, y2);
+ x1 = x2;
+ y1 = y2;
+ } while (!done);
+}
+
+
+
+++ /dev/null
-/*****************************************************************************/
-/* */
-/* tgi_ellipse.c */
-/* */
-/* Draw a full ellipse */
-/* */
-/* */
-/* */
-/* (C) 2002-2009, Ullrich von Bassewitz */
-/* Roemerstrasse 52 */
-/* D-70794 Filderstadt */
-/* EMail: uz@cc65.org */
-/* */
-/* */
-/* This software is provided 'as-is', without any expressed or implied */
-/* warranty. In no event will the authors be held liable for any damages */
-/* arising from the use of this software. */
-/* */
-/* Permission is granted to anyone to use this software for any purpose, */
-/* including commercial applications, and to alter it and redistribute it */
-/* freely, subject to the following restrictions: */
-/* */
-/* 1. The origin of this software must not be misrepresented; you must not */
-/* claim that you wrote the original software. If you use this software */
-/* in a product, an acknowledgment in the product documentation would be */
-/* appreciated but is not required. */
-/* 2. Altered source versions must be plainly marked as such, and must not */
-/* be misrepresented as being the original software. */
-/* 3. This notice may not be removed or altered from any source */
-/* distribution. */
-/* */
-/*****************************************************************************/
-
-
-
-#include <tgi.h>
-#include <cc65.h>
-
-
-
-/*****************************************************************************/
-/* Code */
-/*****************************************************************************/
-
-
-
-static int RoundMul (int rhs, int lhs)
-{
- long res = cc65_imul16x16r32 (rhs, lhs);
- if ((unsigned char)res & 0x80) {
- return (int)(res >> 8) + 1;
- } else {
- return (int)(res >> 8);
- }
-}
-
-
-
-void __fastcall__ tgi_ellipse (int x, int y, unsigned char rx, unsigned char ry)
-/* Draw a full ellipse with center at x/y and radii rx/ry using the current
- * drawing color.
- */
-{
- int x1, y1, x2, y2;
- unsigned angle;
- unsigned char inc;
- unsigned size = rx + ry;
-
- if (size >= 128) {
- inc = 12;
- } else if (size >= 32) {
- inc = 15;
- } else if (size >= 12) {
- inc = 20;
- } else {
- inc = 45;
- }
-
- x1 = x + rx;
- y1 = y;
- angle = 0;
- for (angle = 0; angle <= 360; angle += inc) {
- x2 = x + RoundMul (rx, cc65_cos (angle));
- y2 = y + RoundMul (ry, cc65_sin (angle));
- tgi_line (x1, y1, x2, y2);
- x1 = x2;
- y1 = y2;
- }
-}
-
-
-
--- /dev/null
+;
+; Ullrich von Bassewitz, 2009-11-05
+;
+; void __fastcall__ tgi_ellipse (int x, int y, unsigned char rx, unsigned char ry);
+; /* Draw a full ellipse with center at x/y and radii rx/ry using the current
+; * drawing color.
+; */
+;
+
+
+ .include "tgi-kernel.inc"
+
+ .import pusha, push0
+
+
+;----------------------------------------------------------------------------
+;
+
+.code
+.proc _tgi_ellipse
+
+ jsr pusha ; Push ry
+ jsr push0 ; Start angle is 0
+ lda #<360
+ ldx #>360 ; End angle is 360
+ jmp _tgi_arc
+
+.endproc
projects / cc65 / commitdiff