Adjust sprite bounds of the visible part

cocos2d-x C++
#1

Is there any way to adjust the boundaries of the visible part of the sprite? To make it easier to understand: I have a texture, such as shown at figure 1. Then I break it into pieces and fill the resulting fragments using PRKit - http://www.cocos2d-x.org/boards/6/topics/8101?r=12361#message-12361 (wood texture on figure 2 and 3). But the resulting fragments have the transparent (green color on figure 2 and 3) and when creating a sprite from the fragments they have the size of the initial texture. Is there a way to get rid of this transparency and to adjust the size of the visible part (wood texture), openGL or cocos2d-x means?
Maybe it help - draw() method from PRKit:

void PRFilledPolygon::draw() {

    //CCNode::draw();

    glDisableClientState(GL_COLOR_ARRAY);

    // we have a pointer to vertex points so enable client state
    glBindTexture(GL_TEXTURE_2D, texture->getName());


    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ONE_MINUS_SRC_ALPHA);
    glVertexPointer(2, GL_FLOAT, 0, areaTrianglePoints);
    glTexCoordPointer(2, GL_FLOAT, 0, textureCoordinates);

    glDrawArrays(GL_TRIANGLES, 0, areaTrianglePointCount);
    //glColor4f(abs(rand()%255), abs(rand()%255), 0, 1.0f);

    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

    //Restore texture matrix and switch back to modelview matrix
    glEnableClientState(GL_COLOR_ARRAY);

}


textur.jpg (37.6 KB)

#2

Ok, i did this. First, i create texture from PRFilledPolygon (PRKit), use for that CCRenderTexture, after this i applied the resulting texture for new CCSprite and then i created a bounding box, using data from sites of PRKit and applied it to a sprite using setTextureRect ().

#3

Hi Alex,
How to use PRFilledPolygon?
Could you share some sample code snippet about using PRFilledPolygon in cocos2d-x for me?
I had tried to use it,but it cann’t work correctly.

#4

kundi jiang wrote:

Hi Alex,
How to use PRFilledPolygon?
Could you share some sample code snippet about using PRFilledPolygon in cocos2d-x for me?
I had tried to use it,but it cann’t work correctly.

Ok, take this:

std::vector polygonPoints;
polygonPoints.push_back(Vector2d(0, 0));
polygonPoints.push_back(Vector2d(10, 0));
polygonPoints.push_back(Vector2d(10, 10));
polygonPoints.push_back(Vector2d(0, 10));


CCTexture2D* pTexture =   CCTextureCache::sharedTextureCache()->addImage("your_texture_image"); //must be power of 2 - 32x32, 64x64...512x512

PRFilledPolygon* aFilledPolygon = PRFilledPolygon::filledPolygonWithPointsAndTexture(polygonPoints, pTexture);

CCRenderTexture* polygon = CCRenderTexture::renderTextureWithWidthAndHeight(pTexture->getPixelsWide(), pTexture->getPixelsHigh());
polygon->beginWithClear(1, 1, 1, 0);
aFilledPolygon->visit();
polygon->end();

CCSprite* myNewSprite = polygon->getSprite();
#5

Hi Alex,Could help me about the problem I encountered, reference to url:

http://www.cocos2d-x.org/boards/6/topics/8101?r=14423#message-14423