gxapi_graphics_kni.c

This is a resource based on j2me embedded,if you dont understand,you can connection with me .

             * Optimization: This whole block can skip if 
             * native platform support negative arc input.
             */
            if (arcAngle < 0) {
                startAngle += arcAngle;
                arcAngle = -arcAngle;
            }
            startAngle = (startAngle + 360) % 360;
#endif

            GET_CLIP(thisObject, clip);

            gx_draw_arc(GET_PIXEL(thisObject),
                        clip,
                        GET_IMAGEDATA_PTR_FROM_GRAPHICS(thisObject),
                        GET_LINESTYLE(thisObject),
                        x, y, w, h, startAngle, arcAngle);
        }

        KNI_EndHandles();
    }

    KNI_ReturnVoid();
}

/**
 * Fills the specified circular or elliptical arc segment using the
 * current color and stroke style. According to the MIDP specification,
 * if either the <tt>width</tt> or <tt>height</tt> are negative, no
 * arc is drawn.
 * <p>
 * Java declaration:
 * <pre>
 *     fillArc(IIIIII)V
 * </pre>
 *
 * @param x The x coordinate of the upper-left corner of the arc
 *          to be drawn
 * @param y The y coordinate of the upper-left corner of the arc
 *          to be drawn
 * @param width The width of the arc to be drawn
 * @param height The height of the arc to be drawn
 * @param startAngle The beginning angle
 * @param arcAngle The angular extent of the arc, relative to
 *                 <tt>startAngle</tt>
 */
KNIEXPORT KNI_RETURNTYPE_VOID
KNIDECL(javax_microedition_lcdui_Graphics_fillArc) {
    int   arcAngle = KNI_GetParameterAsInt(6);
    int startAngle = KNI_GetParameterAsInt(5);
    int          h = KNI_GetParameterAsInt(4);
    int          w = KNI_GetParameterAsInt(3);
    int          y = KNI_GetParameterAsInt(2);
    int          x = KNI_GetParameterAsInt(1);

    /*
     * @note { Spec verify step: "If either width or height
     * is less than zero, nothing is drawn." }
     */
    if ((w >= 0) && (h >= 0)) {
        KNI_StartHandles(1);
        KNI_DeclareHandle(thisObject);
        
        KNI_GetThisPointer(thisObject);

        if (GRAPHICS_OP_IS_ALLOWED(thisObject)) {
            jshort clip[4]; /* Defined in Graphics.java as 4 shorts */

            TRANSLATE(thisObject, x, y);
        
#ifdef PLATFORM_SUPPORT_CCW_ARC_ONLY
            /* Please see above for explanation */
            if (arcAngle < 0) {
                startAngle += arcAngle;
                arcAngle = -arcAngle;
            }
            startAngle = (startAngle + 360) % 360;
#endif

            GET_CLIP(thisObject, clip);

            gx_fill_arc(GET_PIXEL(thisObject),
                        clip,
                        GET_IMAGEDATA_PTR_FROM_GRAPHICS(thisObject),
                        GET_LINESTYLE(thisObject),
                        x, y, w, h, startAngle, arcAngle);
        }

        KNI_EndHandles();
    }

    KNI_ReturnVoid();
}

/**
 * Fills the specified triangle using the current color and stroke
 * style.
 * <p>
 * Java declaration:
 * <pre>
 *     fillTriangle(IIIIII)V
 * </pre>
 *
 * @param x1 The x coordinate of the first vertices
 * @param y1 The y coordinate of the first vertices
 * @param x2 The x coordinate of the second vertices
 * @param y2 The y coordinate of the second vertices
 * @param x3 The x coordinate of the third vertices
 * @param y3 The y coordinate of the third vertices
 */
KNIEXPORT KNI_RETURNTYPE_VOID
KNIDECL(javax_microedition_lcdui_Graphics_fillTriangle) {
    int         y3 = KNI_GetParameterAsInt(6);
    int         x3 = KNI_GetParameterAsInt(5);
    int         y2 = KNI_GetParameterAsInt(4);
    int         x2 = KNI_GetParameterAsInt(3);
    int         y1 = KNI_GetParameterAsInt(2);
    int         x1 = KNI_GetParameterAsInt(1);

    KNI_StartHandles(1);
    KNI_DeclareHandle(thisObject);

    KNI_GetThisPointer(thisObject);

    if (GRAPHICS_OP_IS_ALLOWED(thisObject)) {
        jshort clip[4]; /* Defined in Graphics.java as 4 shorts */

        TRANSLATE(thisObject, x1, y1);
        TRANSLATE(thisObject, x2, y2);
        TRANSLATE(thisObject, x3, y3);
      
        GET_CLIP(thisObject, clip);

        gx_fill_triangle(GET_PIXEL(thisObject),
                         clip,
                         GET_IMAGEDATA_PTR_FROM_GRAPHICS(thisObject),
                         GET_LINESTYLE(thisObject),
                         x1, y1, x2, y2, x3, y3);
    }

    KNI_EndHandles();
    KNI_ReturnVoid();
}

/**
 * Draws the specified <tt>String</tt> using the current font and color.
 * <p>
 * Java declaration:
 * <pre>
 *     drawString(Ljava/lang/String;III)V
 * </pre>
 *
 * @param str The <tt>String</tt> to be drawn
 * @param x The x coordinate of the anchor point
 * @param y The y coordinate of the anchor point
 * @param anchor The anchor point for positioning the text
 */
KNIEXPORT KNI_RETURNTYPE_VOID
KNIDECL(javax_microedition_lcdui_Graphics_drawString) {
    int anchor = KNI_GetParameterAsInt(4);
    int      y = KNI_GetParameterAsInt(3);
    int      x = KNI_GetParameterAsInt(2);
    int strLen;

    KNI_StartHandles(3);

    KNI_DeclareHandle(str);
    KNI_DeclareHandle(thisObject);
    KNI_DeclareHandle(font);

    KNI_GetParameterAsObject(1, str);
    KNI_GetThisPointer(thisObject);

    if (GRAPHICS_OP_IS_ALLOWED(thisObject)) {
        strLen = KNI_GetStringLength(str);
        if (strLen < 0) {
            KNI_ThrowNew(midpNullPointerException, NULL);
        } else if (!check_anchor(anchor, VCENTER)) {
            KNI_ThrowNew(midpIllegalArgumentException, NULL);
        } else {
            int      face, style, size;
            _JavaString *jstr;
            jshort clip[4]; /* Defined in Graphics.java as 4 shorts */

            GET_FONT(thisObject, font);
        
            DECLARE_FONT_PARAMS(font);
        
            TRANSLATE(thisObject, x, y);
        
            jstr = GET_STRING_PTR(str);
        
            GET_CLIP(thisObject, clip);

            gx_draw_chars(GET_PIXEL(thisObject),
                          clip,
                          GET_IMAGEDATA_PTR_FROM_GRAPHICS(thisObject),
                          GET_LINESTYLE(thisObject),
                          face, style, size, x, y, anchor, 
                          jstr->value->elements + jstr->offset,
                          strLen);
        }
    }

    KNI_EndHandles();
    KNI_ReturnVoid();
}

/**
 * Draws a portion of the specified <tt>String</tt> using the
 * current font and color.
 * <p>
 * Java declaration:
 * <pre>
 *     drawSubstring(Ljava/lang/String;III)V
 * </pre>
 *
 * @param str The <tt>String</tt> to be drawn
 * @param offset Zero-based index of first character in the substring
 * @param length Length of the substring
 * @param x The x coordinate of the anchor point
 * @param y The y coordinate of the anchor point
 * @param anchor The anchor point for positioning the text
 */
KNIEXPORT KNI_RETURNTYPE_VOID
KNIDECL(javax_microedition_lcdui_Graphics_drawSubstring) {
    int anchor = KNI_GetParameterAsInt(6);
    int      y = KNI_GetParameterAsInt(5);
    int      x = KNI_GetParameterAsInt(4);
    int length = KNI_GetParameterAsInt(3);
    int offset = KNI_GetParameterAsInt(2);
    int strLen;

    KNI_StartHandles(3);

    KNI_DeclareHandle(str);
    KNI_DeclareHandle(thisObject);
    KNI_DeclareHandle(font);

    KNI_GetParameterAsObject(1, str);
    KNI_GetThisPointer(thisObject);

    if (GRAPHICS_OP_IS_ALLOWED(thisObject)) {
        strLen = KNI_GetStringLength(str);
        if (strLen < 0) {
            KNI_ThrowNew(midpNullPointerException, NULL);
        } else if (   (offset < 0) 
                      || (offset > strLen) 
                      || (length < 0)
                      || (length > strLen)
                      || ((offset + length) < 0)
                      || ((offset + length) > strLen)) {
            KNI_ThrowNew(midpStringIndexOutOfBoundsException, NULL);
        } else if (!check_anchor(anchor, VCENTER)) {
            KNI_ThrowNew(midpIllegalArgumentException, NULL);
        } else if (length != 0) {
            int      face, style, size;
            _JavaString *jstr;

            jshort clip[4]; /* Defined in Graphics.java as 4 shorts */
        
            GET_FONT(thisObject, font);
        
            DECLARE_FONT_PARAMS(font);
        
            TRANSLATE(thisObject, x, y);
        
            jstr = GET_STRING_PTR(str);
        
            GET_CLIP(thisObject, clip);

            gx_draw_chars(GET_PIXEL(thisObject),
                          clip,
                          GET_IMAGEDATA_PTR_FROM_GRAPHICS(thisObject),
                          GET_LINESTYLE(thisObject),
                          face, style, size, x, y, anchor,
                          jstr->value->elements + (jstr->offset + offset),
                          length);
        }
    }

    KNI_EndHandles();
    KNI_ReturnVoid();
}

/**
 * Draws the specified character using the current font and color.
 * <p>
 * Java declaration:
 * <pre>
 *     drawChar(CIII)V
 * </pre>
 *
 * @param ch The character to be drawn
 * @param x The x coordinate of the anchor point
 * @param y The y coordinate of the anchor point
 * @param anchor The anchor point for positioning the text
 */
KNIEXPORT KNI_RETURNTYPE_VOID
KNIDECL(javax_microedition_lcdui_Graphics_drawChar) {
    int anchor = KNI_GetParameterAsInt(4);
    int      y = KNI_GetParameterAsInt(3);
    int      x = KNI_GetParameterAsInt(2);
    jchar  c = KNI_GetParameterAsShort(1);

    KNI_StartHandles(2);
    KNI_DeclareHandle(thisObject);
    KNI_DeclareHandle(font);

    KNI_GetThisPointer(thisObject);

    if (GRAPHICS_OP_IS_ALLOWED(thisObject)) {
        if (!check_anchor(anchor, VCENTER)) {
            KNI_ThrowNew(midpIllegalArgumentException, NULL);
        } else {
            int      face, style, size;
            jshort clip[4]; /* Defined in Graphics.java as 4 shorts */

            GET_FONT(thisObject, font);

            DECLARE_FONT_PARAMS(font);

            TRANSLATE(thisObject, x, y);

            GET_CLIP(thisObject, clip);

            gx_draw_chars(GET_PIXEL(thisObject),
                          clip,
                          GET_IMAGEDATA_PTR_FROM_GRAPHICS(thisObject),
                          GET_LINESTYLE(thisObject),
                          face, style, size, x, y, anchor, &c, 1);
        }
    }

    KNI_EndHandles();
    KNI_ReturnVoid();
}

/**
 * Draws the specified characters using the current font and color.
 * <p>
 * Java declaration:
 * <pre>
 *     drawChars([CIIIII)V
 * </pre>
 *
 * @param data The array of characters to be drawn
 * @param offset Zero-based index of first character to be drawn
 * @param length Number of characters to be drawn
 * @param x The x coordinate of the anchor point
 * @param y The y coordinate of the anchor point
 * @param anchor The anchor point for positioning the text
 */
KNIEXPORT KNI_RETURNTYPE_VOID
KNIDECL(javax_microedition_lcdui_Graphics_drawChars) {
    int anchor = KNI_GetParameterAsInt(6);
    int      y = KNI_GetParameterAsInt(5);
    int      x = KNI_GetParameterAsInt(4);
    int length = KNI_GetParameterAsInt(3);
    int offset = KNI_GetParameterAsInt(2);
    int chLen;

    KNI_StartHandles(3);

    KNI_DeclareHandle(ch);
    KNI_DeclareHandle(thisObject);
    KNI_DeclareHandle(font);

    KNI_GetParameterAsObject(1, ch);
    KNI_GetThisPointer(thisObject);

    if (GRAPHICS_OP_IS_ALLOWED(thisObject)) {
        chLen = KNI_GetArrayLength(ch);
        if (chLen < 0) {
            KNI_ThrowNew(midpNullPointerException, NULL);
        } else if (   (offset < 0) 
                      || (offset > chLen) 
                      || (length < 0)
                      || (length > chLen)
                      || ((offset + length) < 0)
                      || ((offset + length) > chLen)) {
            KNI_ThrowNew(midpArrayIndexOutOfBoundsException, NULL);
        } else if (!check_anchor(anchor, VCENTER)) {
            KNI_ThrowNew(midpIllegalArgumentException, NULL);
        } else if (length != 0) {
            int      face, style, size;
            jshort clip[4]; /* Defined in Graphics.java as 4 shorts */

            GET_FONT(thisObject, font);
        
            DECLARE_FONT_PARAMS(font);
        
            TRANSLATE(thisObject, x, y);
        
            GET_CLIP(thisObject, clip);