From 37c6765044c75864f963ba6d6d0585f7ff2e8cd4 Mon Sep 17 00:00:00 2001
From: Subhransu Sekhar Mohanty <sub.mohanty@samsung.com>
Date: Thu, 5 Feb 2015 12:01:24 +0900
Subject: [PATCH] evas/example : updated evas-vg-simple application

Change-Id: Id38a5aca1f5fb7e98021ee325c0b99a63f0df0cf
---
 src/examples/evas/evas-vg-simple.c | 361 ++-----------------------------------
 1 file changed, 12 insertions(+), 349 deletions(-)

diff --git a/src/examples/evas/evas-vg-simple.c b/src/examples/evas/evas-vg-simple.c
index cfaddd5..ea7409f 100644
--- a/src/examples/evas/evas-vg-simple.c
+++ b/src/examples/evas/evas-vg-simple.c
@@ -32,352 +32,13 @@
 #include <Ecore.h>
 #include <Ecore_Evas.h>
 
-
-#include <math.h>
-#include <Eina.h>
-
-#define PATH_KAPPA 0.5522847498
-#define PI         3.1415926535
-
-typedef struct _Bezier
-{
-float x1, y1, x2, y2, x3, y3, x4, y4;
-}Bezier;
-
-typedef struct _Point
-{
-    int x;
-    int y;
-}Point;
-
-static
-Bezier bezierFromPoints(Point p1, Point p2,
-                            Point p3, Point p4)
-{
-    Bezier b;
-    b.x1 = p1.x;
-    b.y1 = p1.y;
-    b.x2 = p2.x;
-    b.y2 = p2.y;
-    b.x3 = p3.x;
-    b.y3 = p3.y;
-    b.x4 = p4.x;
-    b.y4 = p4.y;
-    return b;
-}
-
-inline void
-parameterSplitLeft(Bezier *b, float t, Bezier *left)
-{
-    left->x1 = b->x1;
-    left->y1 = b->y1;
-
-    left->x2 = b->x1 + t * ( b->x2 - b->x1 );
-    left->y2 = b->y1 + t * ( b->y2 - b->y1 );
-
-    left->x3 = b->x2 + t * ( b->x3 - b->x2 ); // temporary holding spot
-    left->y3 = b->y2 + t * ( b->y3 - b->y2 ); // temporary holding spot
-
-    b->x3 = b->x3 + t * ( b->x4 - b->x3 );
-    b->y3 = b->y3 + t * ( b->y4 - b->y3 );
-
-    b->x2 = left->x3 + t * ( b->x3 - left->x3);
-    b->y2 = left->y3 + t * ( b->y3 - left->y3);
-
-    left->x3 = left->x2 + t * ( left->x3 - left->x2 );
-    left->y3 = left->y2 + t * ( left->y3 - left->y2 );
-
-    left->x4 = b->x1 = left->x3 + t * (b->x2 - left->x3);
-    left->y4 = b->y1 = left->y3 + t * (b->y2 - left->y3);
-}
-static
-Bezier bezierOnInterval(Bezier *b, float t0, float t1)
-{
-    if (t0 == 0 && t1 == 1)
-        return *b;
-
-    Bezier result;
-    parameterSplitLeft(b, t0, &result);
-    float trueT = (t1-t0)/(1-t0);
-    parameterSplitLeft(b, trueT, &result);
-
-    return result;
-}
-
-inline void
-_bezier_coefficients(float t, float *ap, float *bp, float *cp, float *dp)
-{
-    float a,b,c,d;
-    float m_t = 1. - t;
-    b = m_t * m_t;
-    c = t * t;
-    d = c * t;
-    a = b * m_t;
-    b *= 3. * t;
-    c *= 3. * m_t;
-    *ap = a;
-    *bp = b;
-    *cp = c;
-    *dp = d;
-}
-
-static
-float _t_for_arc_angle(float angle)
-{
-    if (angle < 0.00001)
-        return 0;
-
-    if (angle == 90.0)
-        return 1;
-
-    float radians = PI * angle / 180;
-    float cosAngle = cos(radians);
-    float sinAngle = sin(radians);
-
-    // initial guess
-    float tc = angle / 90;
-    // do some iterations of newton's method to approximate cosAngle
-    // finds the zero of the function b.pointAt(tc).x() - cosAngle
-    tc -= ((((2-3*PATH_KAPPA) * tc + 3*(PATH_KAPPA-1)) * tc) * tc + 1 - cosAngle) // value
-         / (((6-9*PATH_KAPPA) * tc + 6*(PATH_KAPPA-1)) * tc); // derivative
-    tc -= ((((2-3*PATH_KAPPA) * tc + 3*(PATH_KAPPA-1)) * tc) * tc + 1 - cosAngle) // value
-         / (((6-9*PATH_KAPPA) * tc + 6*(PATH_KAPPA-1)) * tc); // derivative
-
-    // initial guess
-    float ts = tc;
-    // do some iterations of newton's method to approximate sinAngle
-    // finds the zero of the function b.pointAt(tc).y() - sinAngle
-    ts -= ((((3*PATH_KAPPA-2) * ts -  6*PATH_KAPPA + 3) * ts + 3*PATH_KAPPA) * ts - sinAngle)
-         / (((9*PATH_KAPPA-6) * ts + 12*PATH_KAPPA - 6) * ts + 3*PATH_KAPPA);
-    ts -= ((((3*PATH_KAPPA-2) * ts -  6*PATH_KAPPA + 3) * ts + 3*PATH_KAPPA) * ts - sinAngle)
-         / (((9*PATH_KAPPA-6) * ts + 12*PATH_KAPPA - 6) * ts + 3*PATH_KAPPA);
-
-    // use the average of the t that best approximates cosAngle
-    // and the t that best approximates sinAngle
-    float t = 0.5 * (tc + ts);
-    return t;
-}
-
-static void
-_find_ellipse_coords(int x, int y, int w, int h, float angle, float length,
-                            Point* startPoint, Point *endPoint)
-{
-    if (!w || !h ) {
-        if (startPoint)
-            startPoint->x = 0 , startPoint->y = 0;
-        if (endPoint)
-            endPoint->x = 0 , endPoint->y = 0;
-        return;
-    }
-
-    int w2 = w / 2;
-    int h2 = h / 2;
-
-    float angles[2] = { angle, angle + length };
-    Point *points[2] = { startPoint, endPoint };
-    int i =0;
-    for (i = 0; i < 2; ++i) {
-        if (!points[i])
-            continue;
-
-        float theta = angles[i] - 360 * floor(angles[i] / 360);
-        float t = theta / 90;
-        // truncate
-        int quadrant = (int)t;
-        t -= quadrant;
-
-        t = _t_for_arc_angle(90 * t);
-
-        // swap x and y?
-        if (quadrant & 1)
-            t = 1 - t;
-
-        float a, b, c, d;
-        _bezier_coefficients(t, &a, &b, &c, &d);
-        float px = a + b + c*PATH_KAPPA;
-        float py = d + c + b*PATH_KAPPA;
-
-        // left quadrants
-        if (quadrant == 1 || quadrant == 2)
-            px = -px;
-
-        // top quadrants
-        if (quadrant == 0 || quadrant == 1)
-            py = -py;
-           int cx = x+w/2;
-           int cy = y+h/2;
-         points[i]->x = cx + w2 * px;
-         points[i]->y = cy + h2 * py;
-    }
-}
-
-
-//// The return value is the starting point of the arc
-static
-Point _curves_for_arc(int x, int y, int w, int h,
-                      float startAngle, float sweepLength,
-                      Point *curves, int *point_count)
-{
-    *point_count = 0;
-    int w2 = w / 2;
-    int w2k = w2 * PATH_KAPPA;
-
-    int h2 = h / 2;
-    int h2k = h2 * PATH_KAPPA;
-
-    Point points[16] =
-    {
-        // start point
-        x + w, y + h2,
-
-        // 0 -> 270 degrees
-        x + w, y + h2 + h2k,
-        x + w2 + w2k, y + h,
-        x + w2, y + h,
-
-        // 270 -> 180 degrees
-        x + w2 - w2k, y + h,
-        x, y + h2 + h2k,
-        x, y + h2,
-
-        // 180 -> 90 degrees
-        x, y + h2 - h2k,
-        x + w2 - w2k, y,
-        x + w2, y,
-
-        // 90 -> 0 degrees
-        x + w2 + w2k, y,
-        x + w, y + h2 - h2k,
-        x + w, y + h2
-    };
-
-    if (sweepLength > 360) sweepLength = 360;
-    else if (sweepLength < -360) sweepLength = -360;
-
-    // Special case fast paths
-    if (startAngle == 0) {
-        if (sweepLength == 360) {
-	    int i;
-            for (i = 11; i >= 0; --i)
-                curves[(*point_count)++] = points[i];
-            return points[12];
-        } else if (sweepLength == -360) {
-	    int i ;
-            for (i = 1; i <= 12; ++i)
-                curves[(*point_count)++] = points[i];
-            return points[0];
-        }
-    }
-
-    int startSegment = (int)(floor(startAngle / 90));
-    int endSegment = (int)(floor((startAngle + sweepLength) / 90));
-
-    float startT = (startAngle - startSegment * 90) / 90;
-    float endT = (startAngle + sweepLength - endSegment * 90) / 90;
-
-    int delta = sweepLength > 0 ? 1 : -1;
-    if (delta < 0) {
-        startT = 1 - startT;
-        endT = 1 - endT;
-    }
-
-    // avoid empty start segment
-    if (startT == 1.0) {
-        startT = 0;
-        startSegment += delta;
-    }
-
-    // avoid empty end segment
-    if (endT == 0) {
-        endT = 1;
-        endSegment -= delta;
-    }
-
-    startT = _t_for_arc_angle(startT * 90);
-    endT = _t_for_arc_angle(endT * 90);
-
-    Eina_Bool splitAtStart = !(fabs(startT) <= 0.00001f);
-    Eina_Bool splitAtEnd = !(fabs(endT - 1.0) <= 0.00001f);
-
-    const int end = endSegment + delta;
-
-    // empty arc?
-    if (startSegment == end) {
-        const int quadrant = 3 - ((startSegment % 4) + 4) % 4;
-        const int j = 3 * quadrant;
-        return delta > 0 ? points[j + 3] : points[j];
-    }
-
-
-    Point startPoint, endPoint;
-    _find_ellipse_coords(x, y, w, h, startAngle, sweepLength, &startPoint, &endPoint);
-    int i;
-    for (i = startSegment; i != end; i += delta) {
-        const int quadrant = 3 - ((i % 4) + 4) % 4;
-        const int j = 3 * quadrant;
-
-        Bezier b;
-        if (delta > 0)
-            b = bezierFromPoints(points[j + 3], points[j + 2], points[j + 1], points[j]);
-        else
-            b = bezierFromPoints(points[j], points[j + 1], points[j + 2], points[j + 3]);
-
-        // empty arc?
-        if (startSegment == endSegment && (startT == endT))
-            return startPoint;
-
-        if (i == startSegment) {
-            if (i == endSegment && splitAtEnd)
-                b = bezierOnInterval(&b, startT, endT);
-            else if (splitAtStart)
-                b = bezierOnInterval(&b, startT, 1);
-        } else if (i == endSegment && splitAtEnd) {
-            b = bezierOnInterval(&b, 0, endT);
-        }
-
-        // push control points
-        curves[(*point_count)].x = b.x2;
-        curves[(*point_count)++].y = b.y2;
-        curves[(*point_count)].x = b.x3;
-        curves[(*point_count)++].y = b.y3;
-        curves[(*point_count)].x = b.x4;
-        curves[(*point_count)++].y = b.y4;
-    }
-
-    curves[*(point_count)-1] = endPoint;
-
-    return startPoint;
-}
-
-void _arcto(Efl_Gfx_Path_Command **path_cmd, double **points,int x, int y, int width, int height, int startAngle, int sweepLength)
-{
-    int point_count;
-
-    Point pts[15];
-    Point curve_start = _curves_for_arc(x,y,width,height, startAngle, sweepLength, pts, &point_count);
-    int cx = x + (width)/2;
-    int cy = y + (height)/2;
-
-    efl_gfx_path_append_move_to(path_cmd, points, cx, cy);
-
-    efl_gfx_path_append_line_to(path_cmd, points, curve_start.x, curve_start.y);
-    int i;
-    for (i=0; i<point_count; i+=3) {
-        efl_gfx_path_append_cubic_to(path_cmd, points,
-                pts[i+2].x, pts[i+2].y,
-                pts[i].x, pts[i].y,
-                pts[i+1].x, pts[i+1].y);
-    }
-    efl_gfx_path_append_close(path_cmd, points);
-}
-
 void _rect_add(Efl_Gfx_Path_Command **path_cmd, double **points,int x, int y, int w, int h)
 {
-    efl_gfx_path_append_move_to(path_cmd, points, x, y);
-    efl_gfx_path_append_line_to(path_cmd, points, x + w, y);
-    efl_gfx_path_append_line_to(path_cmd, points, x + w, y +h);
-    efl_gfx_path_append_line_to(path_cmd, points, x, y +h);
-    efl_gfx_path_append_close(path_cmd, points);
+   efl_gfx_path_append_move_to(path_cmd, points, x, y);
+   efl_gfx_path_append_line_to(path_cmd, points, x + w, y);
+   efl_gfx_path_append_line_to(path_cmd, points, x + w, y +h);
+   efl_gfx_path_append_line_to(path_cmd, points, x, y +h);
+   efl_gfx_path_append_close(path_cmd, points);
 }
 
 
@@ -461,8 +122,9 @@ vector_set(int x, int y, int w, int h)
    Evas_VG_Node *shape = eo_add(EVAS_VG_SHAPE_CLASS, root);
    Evas_VG_Node *rgradient = eo_add(EVAS_VG_GRADIENT_RADIAL_CLASS, root);
    Evas_VG_Node *lgradient = eo_add(EVAS_VG_GRADIENT_LINEAR_CLASS, root);
-
-    _arcto(&path_cmd, &points, 0, 0, 100, 100, 25, 330);
+    efl_gfx_path_append_move_to(&path_cmd, &points, 50, 50);
+    efl_gfx_path_append_arc(&path_cmd, &points, 0, 0, 100, 100, 120, 300);
+    efl_gfx_path_append_close(&path_cmd, &points);
 
     Efl_Gfx_Gradient_Stop stops[3];
     stops[0].r = 255;
@@ -501,10 +163,10 @@ vector_set(int x, int y, int w, int h)
 
    eo_do(shape,
          evas_vg_node_origin_set(10, 10),
-         evas_vg_shape_fill_set(rgradient),
+         //evas_vg_shape_fill_set(rgradient),
          efl_gfx_shape_stroke_scale_set(2.0),
          efl_gfx_shape_stroke_width_set(1.0),
-         efl_gfx_color_set(0, 0, 255, 255),
+         //efl_gfx_color_set(0, 0, 255, 255),
          efl_gfx_shape_stroke_color_set(0, 0, 255, 128),
          efl_gfx_shape_path_set(path_cmd, points));
 
@@ -549,7 +211,8 @@ vector_set(int x, int y, int w, int h)
 
 
    Evas_VG_Node *circle = eo_add(EVAS_VG_SHAPE_CLASS, root);
-   _arcto(&path_cmd, &points, 0, 0, 250, 100, 30, 300);
+   efl_gfx_path_append_move_to(&path_cmd, &points, 125, 50);
+   efl_gfx_path_append_arc(&path_cmd, &points, 0, 0, 250, 100, 30, 300);
    eo_do(circle,
          evas_vg_shape_fill_set(lgradient),
          //evas_vg_node_transformation_set(&matrix),
-- 
2.7.4