TempleOSTS_140317.ISO

Demo/Graphics/Symmetry.CPP

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+//This is demonstrates symmetry.
+//Right-click and draw line of symmetry.
+//If the line of symmetry is a point, symmetry is turned-off.
+
+U0 SymmetryDemo()
+{
+  I64 msg_code,x1,y1,x2,y2,p1,p2;
+  CDC *dc=DCAlias;
+
+  SettingsPush; //See $LK,"SettingsPush",A="MN:SettingsPush"$
+  Fs->win_inhibit=WIG_TASK_DFT-WIF_FOCUS-WIF_BORDER;
+
+  WinMax;
+  DCFill;
+  DocClear;
+  dc->flags|=DCF_SYMMETRY;
+  GrSetSymmetry(dc,Fs->pix_width/2,0,Fs->pix_width/2,1);
+  do {
+    msg_code=GetMsg(&p1,&p2,
+      1<<MSG_KEY_DOWN+1<<MSG_IP_L_DOWN+
+      1<<MSG_IP_R_DOWN);
+    switch (msg_code) {
+      case MSG_IP_R_DOWN:
+	dc->flags&=~DCF_SYMMETRY;
+	dc->color=ROP_XOR+RED^COLOR_TRANSPARENT;
+	x1=p1; y1=p2;
+	x2=p1; y2=p2;
+	while (msg_code!=MSG_IP_R_UP) {
+	  GrLine3(dc,x1,y1,0,x2,y2,0);
+	  msg_code=GetMsg(&p1,&p2,
+	    1<<MSG_IP_R_UP+1<<MSG_IP_MOVE);
+	  GrLine3(dc,x1,y1,0,x2,y2,0);
+	  x2=p1; y2=p2;
+	}
+	GrLine3(dc,x1,y1,0,x2,y2,0);
+	if (GrSetSymmetry3(dc,x1,y1,0,x2,y2,0,x2,y2,1))
+	  dc->flags|=DCF_SYMMETRY;
+	break;
+      case MSG_IP_L_DOWN:
+	dc->color=ROP_XOR+BLACK^COLOR_TRANSPARENT;
+	x1=p1; y1=p2;
+	x2=p1; y2=p2;
+	while (msg_code!=MSG_IP_L_UP) {
+	  GrLine3(dc,x1,y1,0,x2,y2,0);
+	  msg_code=GetMsg(&p1,&p2,
+	    1<<MSG_IP_L_UP+1<<MSG_IP_MOVE);
+	  GrLine3(dc,x1,y1,0,x2,y2,0);
+	  x2=p1; y2=p2;
+	}
+	GrLine3(dc,x1,y1,0,x2,y2,0);
+	break;
+      case MSG_KEY_DOWN:
+	break;
+    }
+  } while (msg_code!=MSG_KEY_DOWN || !p1);
+  GetMsg(,,1<<MSG_KEY_UP);
+  DCFill;
+  DCDel(dc);
+  SettingsPop;
+}
+
+SymmetryDemo;  //Execute when #included