simpleturtle.c

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#include "../awt/frame.h"
#include "turtlegraphic.h"
#include "simpleturtle.h"

#ifdef __cplusplus
extern "C" {
#endif

#ifdef __cplusplus
   #define ST_PARAM_FRAME 
   #define ST_PARAM_END_FRAME 
   #define ST_PARAM_TG 
   #define ST_PARAM_END_TG 
#else
   #define ST_PARAM_FRAME &st_frame, 
   #define ST_PARAM_END_FRAME &st_frame 
   #define ST_PARAM_TG &st_tg, 
   #define ST_PARAM_END_TG &st_tg 
#endif

#define ST_DEFAULT_CP "./grubc.jar" 
#define ST_DEFAULT_TITLE "SIMPLE TURTLE" 
#define ST_DEFAULT_WIDTH 600 
#define ST_DEFAULT_HEIGHT 400 
static Jvm st_jvm; 
static Frame st_frame; 
static TurtleGraphic st_tg; 
static jboolean st_init = JNI_FALSE;
static jboolean st_closeing = JNI_FALSE;

void st_windowListener(jint event, jobject window) {
   switch (event) {
      case CB_WINDOW_CLOSING:
         st_closeing = JNI_TRUE;
         break;
   }
}

void initSimpleTurtle(const char* classpath, const char* title, jint framewidth, jint frameheight) {
   if (!st_init) { /* init the Simple Turtle only once */
      st_init = JNI_TRUE;

      initJvm(&st_jvm, classpath);

      createFrame(&st_frame);
      createTurtleGraphic(&st_tg, &st_frame);

      st_frame.addWindowListener(ST_PARAM_FRAME &st_windowListener);

      st_frame.setTitle(ST_PARAM_FRAME title);
      st_frame.setSize(ST_PARAM_FRAME framewidth, frameheight);
      st_frame.show(ST_PARAM_END_FRAME);
   }
}

void checkSimpleTurtleInit() {
   if (!st_init) {
      initSimpleTurtle(ST_DEFAULT_CP, ST_DEFAULT_TITLE, ST_DEFAULT_WIDTH, ST_DEFAULT_HEIGHT);
   }
}

void forward(jfloat l) {
   checkSimpleTurtleInit();
   st_tg.forward(ST_PARAM_TG l);
}

void backward(jfloat l) {
   checkSimpleTurtleInit();
   st_tg.backward(ST_PARAM_TG l);
}

void left(jfloat angle) {
   checkSimpleTurtleInit();
   st_tg.left(ST_PARAM_TG angle);
}

void right(jfloat angle) {
   checkSimpleTurtleInit();
   st_tg.right(ST_PARAM_TG angle);
}

void penUp() {
   checkSimpleTurtleInit();
   st_tg.setDraw(ST_PARAM_TG JNI_FALSE);
}

void penDown() {
   checkSimpleTurtleInit();
   st_tg.setDraw(ST_PARAM_TG JNI_TRUE);
}

void print(const char* text) {
   checkSimpleTurtleInit();
   st_tg.printText(ST_PARAM_TG text);
}

void setColor(Color c) {
   checkSimpleTurtleInit();
   st_tg.setColor(ST_PARAM_TG c);
}

void setBGColor(Color c) {
   checkSimpleTurtleInit();
   st_frame.setBackgroundColor(ST_PARAM_FRAME c);
}

void clearScreen() {
   checkSimpleTurtleInit();
   st_tg.clearScreen(ST_PARAM_END_TG);
}

void waitForClosingFrame() {
   checkSimpleTurtleInit();
   while (!st_closeing) {
      jnisleep(100);
   }
}

#ifdef __cplusplus
} /* extern "C" */
#endif

/* end of file simpleturtle.c */

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