xref: /haiku/src/apps/haikudepot/util/RatingUtils.cpp (revision c3cad236175a6b7fab561908914816ce22ec0590)

/*
 * Copyright 2020-2024, Andrew Lindesay <apl@lindesay.co.nz>.
 * All rights reserved. Distributed under the terms of the MIT License.
 */

#include <View.h>


#include "HaikuDepotConstants.h"
#include "Logger.h"
#include "RatingUtils.h"
#include "SharedIcons.h"


RatingStarsMetrics::RatingStarsMetrics(BSize starSize)
	:
	fStarSize(starSize)
{
}


const BSize
RatingStarsMetrics::StarSize() const
{
	return fStarSize;
}


float
RatingStarsMetrics::SpacingBetweenStars() const
{
	return 2.0 * fStarSize.Width() / 16.0;
}


const BPoint
RatingStarsMetrics::LocationOfStarAtIndex(int index) const
{
	float indexf = static_cast<float>(index);
	return BPoint(indexf * (fStarSize.Width() + SpacingBetweenStars()), 0.0);
}


const BSize
RatingStarsMetrics::Size() const
{
	return BSize((fStarSize.Width() * 5) + (SpacingBetweenStars() * 4), fStarSize.Height());
}


/*static*/ void
RatingUtils::Draw(BView* target, BPoint at, float value)
{
	const BBitmap* star;

	if (value < RATING_MIN)
		star = SharedIcons::IconStarGrey16Scaled()->Bitmap();
	else
		star = SharedIcons::IconStarBlue16Scaled()->Bitmap();

	if (star == NULL) {
		debugger("no star icon found in application resources.");
		return;
	}

	Draw(target, at, value, star);
}


/*static*/ void
RatingUtils::Draw(BView* target, BPoint at, float value,
	const BBitmap* star)
{
	if (star == NULL) {
		HDFATAL("no star icon found in application resources.");
		return;
	}

	RatingStarsMetrics metrics(star->Bounds().Size());
	BRect rect(at, metrics.Size());

	target->FillRect(rect, B_SOLID_LOW);
		// a rectangle covering the whole area of the stars

	target->SetDrawingMode(B_OP_OVER);

	for (int i = 0; i < 5; i++)
		target->DrawBitmap(star, rect.LeftTop() + metrics.LocationOfStarAtIndex(i));

	if (value >= RATING_MIN && value < 5.0f) {
		target->SetDrawingMode(B_OP_OVER);
		BRect shadeOverRect = rect;
		shadeOverRect.left = ceilf(rect.right - (1.0 - (value / 5.0f)) * rect.Width());

		rgb_color color = target->LowColor();
		color.alpha = 190;
		target->SetHighColor(color);

		target->SetDrawingMode(B_OP_ALPHA);
		target->FillRect(shadeOverRect, B_SOLID_HIGH);
	}
}