#include <stdio.h>

#include <math.h>

#include <VG/openvg.h>

#include <VG/vgu.h>

#include "segl.h"

void bounce(int numpts, float *pos, float *inc, float width, float height)

{

while (numpts--) {

*pos += *inc;

if (*pos >= width) {

*pos = width - (*pos - width);

*inc = -*inc;

}

if (*pos < 0.0) {

*pos = -*pos;

*inc = -*inc;

}

pos++;

inc++;

*pos += *inc;

if (*pos >= height) {

*pos = height - (*pos - height);

*inc = -*inc;

}

if (*pos < 0.0) {

*pos = -*pos;

*inc = -*inc;

}

pos++;

inc++;

}

}

int main(int argc, char **argv)

{

float rotate, color[4] = {0.0, 0.33, 0.33, 1.0};

VGPath path;

VGPaint paintStroke;

VGubyte pathSegments[] = {VG_MOVE_TO_ABS, VG_LINE_TO_ABS, VG_CLOSE_PATH};

float pathData[] = {200.0, 300.0, 100.0, 100.0};

float incData[] = { 1.0, 2.0, -2.5, -0.5};

EGLDisplayState *eglState = eglOpenDisplay(0 /* min win dimension */,

8 /* min color component size */,

8 /* min alpha size */,

0 /* min Z depth */,

EGL_OPENVG_BIT /* render type */);

path = vgCreatePath(VG_PATH_FORMAT_STANDARD,

VG_PATH_DATATYPE_F,

1.0, 0.0,

0, 0,

VG_PATH_CAPABILITY_APPEND_TO | VG_PATH_CAPABILITY_MODIFY);

vgAppendPathData(path, 3, pathSegments, pathData);

paintStroke = vgCreatePaint();

vgSetColor(paintStroke, 0x00FF00FF);

vgSetParameteri(paintStroke, VG_PAINT_TYPE, VG_PAINT_TYPE_COLOR);

vgSetPaint(paintStroke, VG_STROKE_PATH | VG_FILL_PATH);

vgSetf(VG_STROKE_LINE_WIDTH, 5.0);

vgLoadIdentity();

for (rotate = 0.0; rotate < 1000.0; rotate++) {

color[0] = rotate / 1000.0;

vgSetfv(VG_CLEAR_COLOR, 4, color);

vgClear(0, 0, eglState->win.width, eglState->win.height);

bounce(2, pathData, incData, eglState->win.width, eglState->win.height);

vgModifyPathCoords(path, 0, 3, pathData);

vgDrawPath(path, VG_STROKE_PATH);

eglUpdateDisplay(eglState);

}

eglCloseDisplay(eglState);

}