From 7824fa044ac7d2db13af5873ce2e90365153e0be Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Mon, 10 Aug 2026 11:11:18 -0700
Subject: Chapter 31: Software Drawing and Graphical Games

Co-authored-by: Hsiang-Ying Fu <66062782+fuhsnn@users.noreply.github.com>
Co-authored-by: fuhsnn <66062782+fuhsnn@users.noreply.github.com>
Co-authored-by: Symious <14933944+symious@users.noreply.github.com>
Co-authored-by: Jun Kawasaki <jun784@gmail.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
---
 src/test/java/com/seaofnodes/simple/DrawTest.java | 105 ++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 src/test/java/com/seaofnodes/simple/DrawTest.java

(limited to 'src/test/java/com/seaofnodes/simple/DrawTest.java')

diff --git a/src/test/java/com/seaofnodes/simple/DrawTest.java b/src/test/java/com/seaofnodes/simple/DrawTest.java
new file mode 100644
index 00000000..6eb261f1
--- /dev/null
+++ b/src/test/java/com/seaofnodes/simple/DrawTest.java
@@ -0,0 +1,105 @@
+package com.seaofnodes.simple;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.junit.Test;
+
+// Native raster and game checks; no backend or display is needed.
+public class DrawTest {
+    @Test public void rectanglesAndColors() throws Exception {
+        TestC.runSYS("""
+            val main = { ->
+                val c = new sys.draw.Canvas(12,10);
+                u32 color = sys.draw.rgb(300,-1,128);
+                if( color!=16711808 ) return 1;
+                c.clear(7).fillRect(-2,-1,5,4,color);
+                for( int y=0; y<10; y++ )
+                    for( int x=0; x<12; x++ )
+                        if( c.pixels[y*12+x]!=(x<3 && y<3 ? color : 7) ) return 2;
+                c.clear(0).rect(2,2,7,6,1,9);
+                for( int y=0; y<10; y++ )
+                    for( int x=0; x<12; x++ ) {
+                        var inside = 2<=x<9 && 2<=y<8;
+                        var border = inside && (x==2 || x==8 || y==2 || y==7);
+                        if( c.pixels[y*12+x]!=(border ? 9 : 0) ) return 3;
+                    }
+                c.clear(5).fillRect(20,0,8,8,1).rect(0,0,12,10,0,1);
+                c.fillRect(0,0,-1,5,1).pixel(-1,0,1).pixel(12,9,1);
+                for( int i=0; i<c.pixels#; i++ ) if( c.pixels[i]!=5 ) return 4;
+                return 0;
+            };
+            ""","drawRectangles","",-1);
+    }
+
+    @Test public void circlesLinesAndText() throws Exception {
+        TestC.runSYS("""
+            val main = { ->
+                val c = new sys.draw.Canvas(16,16);
+                c.fillCircle(8,8,3,1);
+                for( int y=0; y<16; y++ )
+                    for( int x=0; x<16; x++ )
+                        if( c.pixels[y*16+x]!=((x-8)*(x-8)+(y-8)*(y-8)<=9 ? 1 : 0) ) {
+                            sys.io.p("circle mismatch %(x) %(y): %(c.pixels[y*16+x])\\n");
+                            return 1;
+                        }
+                c.clear(0).circle(8,8,3,1,2);
+                if( c.pixels[8*16+8]!=0 || c.pixels[8*16+11]!=2 || c.pixels[8*16+10]!=0 ) return 2;
+                c.clear(0).circle(8,8,3,3,2);
+                if( c.pixels[8*16+8]!=2 ) return 8;
+                c.clear(0).line(-5,8,20,8,3,3);
+                for( int y=0; y<16; y++ )
+                    for( int x=0; x<16; x++ )
+                        if( c.pixels[y*16+x]!=(7<=y<=9 ? 3 : 0) ) return 3;
+                c.clear(0).line(8,8,8,8,2,4);
+                if( c.pixels[8*16+8]!=4 || c.pixels[8*16+9]!=4 || c.pixels[9*16+9]!=0 ) return 4;
+                c.clear(0).line(2,2,13,13,1,5);
+                if( c.pixels[7*16+7]!=5 || c.pixels[7*16+8]!=0 ) return 5;
+                c.clear(0).text(0,0,"x",1,6).text(8,0,"X",1,6);
+                for( int y=0; y<5; y++ )
+                    for( int x=0; x<3; x++ )
+                        if( c.pixels[y*16+x]!=c.pixels[y*16+x+8] ) return 6;
+                c.clear(0).fillCircle(-1,-1,2,7);
+                if( c.pixels[0]!=7 || c.pixels[2]!=0 ) return 7;
+                return 0;
+            };
+            ""","drawCurves","",-1);
+    }
+
+    @Test public void graphicalGameWithoutWindow() throws Exception {
+        String game=Files.readString(Path.of("docs/examples/TicTacToeGraphical.smp"))
+            .replace("val main =","val _windowMain =");
+        TestC.runSYS(game+"""
+
+            val main = { ->
+                val board = new u8[9];
+                _reset(board);
+                if( _square(48,168)!=0 || _square(551,671)!=8 || _square(552,400)!=-1 || _square(100,167)!=-1 ) return 1;
+                if( !_move(board,4) || board[4]!='X' || board[0]!='O' ) return 2;
+                if( _sound(board)!=sys.audio.BOOP ) return 10;
+                if( _move(board,4) || _move(board,0) || _move(board,-1) || _move(board,9) ) return 3;
+                val moves = "1879";
+                _reset(board);
+                for( int i=0; i<moves#; i++ )
+                    if( !_move(board,moves[i]-'1') ) return 4;
+                if( _winner(board)!='X' || _move(board,1) ) return 5;
+                if( _sound(board)!=sys.audio.WIN ) return 11;
+                val screen = new sys.draw.Canvas(600,780);
+                _draw(screen,board,-1);
+                if( screen.pixels[252*600+132]==screen.pixels[0] ) return 6;
+                _reset(board);
+                val draw = "12768";
+                for( int i=0; i<draw#; i++ ) _move(board,draw[i]-'1');
+                if( !_finished(board) || _winner(board)!=0 ) return 7;
+                _reset(board);
+                _move(board,0); _move(board,1); _move(board,3);
+                if( _winner(board)!='O' ) return 8;
+                if( _sound(board)!=sys.audio.LOSE ) return 12;
+                _draw(screen,board,-1);
+                _reset(board);
+                if( _finished(board) ) return 9;
+                _draw(screen,board,4);
+                return 0;
+            };
+            ""","drawGame","",-1);
+    }
+}
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