CPSC 221 block cpp basic algorithm and problem solving

#include "block.h"


/**
* From im, grabs the vertical strip of pixels whose
* upper left corner is at position (column,0), and
* whose width is width.
*/
void Block::build(PNG & im, int column, int width){

int h = im.height();
// first x,then y,copy vertically
for (int i = column; i < column + width; i++) {
vector<HSLAPixel> temp;
for (int j = 0; j < h; j++) {
HSLAPixel* p = im.getPixel(i, j);
temp.push_back(*p);
}
data.push_back(temp);
}
return;
};




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/**
* Draws the current block at position (column,0) in im.




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void Block::render(PNG & im, int column) const {
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for (int i = column; i <column + width(); i++) {
for (int j = 0; j < height(); j++) {
HSLAPixel* p = im.getPixel(i, j);
*p = data[i-column][j];
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}
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}
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};

/**
* This function changes the saturation of every pixel
* in the block to 0, which removes the color, leaving grey.
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*/
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void Block::greyscale(){
if (data.empty())
{return;}

for(int i = 0; i < width(); i++){
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for(int j = 0; j < height(); j++){
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HSLAPixel * pixel= &data[i][j];
pixel->s=0;
}}

};

/**
* Returns the width of the current block.
*/
int Block::width() const {
return data.size();

};

/**
* Returns the height of the current block.

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