C++ GImage::clear方法代码示例

	void update()
	{
		m_pImage->clear(0xff000000); // a=ff, r=00, g=00, b=00
		HelloModel* pModel = m_pController->model();
		m_pImage->text(g_szMessage, pModel->x(), pModel->y(), TEXT_SIZE, 0xffffff30); // a=ff, r=ff, g=ff, b=30
		m_pCanvas->setImage(m_pImage);
	}

// static
void GSubImageFinder2::test()
{
	// Make some random image
	GImage foo;
	foo.setSize(256, 256);
	foo.clear(0xff000000);
	foo.boxFill(13, 8, 12, 17, 0xff808030);
	foo.boxFill(8, 13, 10, 9, 0xff407040);
	foo.boxFill(20, 20, 220, 220, 0xffffffee);

	// Make the finder
	GSubImageFinder2 finder(&foo);

	// Make a sub-image
	GRect r2(0, 0, 256, 256);
	GRect r;
	r.x = 13;
	r.y = 17;
	r.w = 32;
	r.h = 32;
	GImage bar;
	bar.setSize(32, 32);
	bar.blit(0, 0, &foo, &r);

	// Find the sub-image
	r.x = 0;
	r.y = 0;
	int x, y;
	finder.findSubImage(&x, &y, &bar, &r);
	if(x != 13 || y != 17)
		throw "wrong answer";
}

// static
void GPlotWindow::stringLabel(GImage* pImage, const char* szText, int x, int y, float size, unsigned int color, double angle)
{
	// Draw the label such that it ends at the center of the temp image
	int width = GImage::measureTextWidth(szText, size);
	int nSize = (int)(std::max((float)width, size * 12) * 2.3);
	GImage tmp;
	tmp.setSize(nSize, nSize);
	tmp.clear(0x0);
	tmp.text(szText, nSize / 2 - width, (int)((nSize - size * 12) / 2), size, color, 1000, 1000);

	// Rotate the label around the center
	GImage tmp2;
	tmp2.rotate(&tmp, nSize / 2, nSize / 2, angle);

	// Blit such that the label ends at the specified point
	GRect r(0, 0, nSize, nSize);
	pImage->blitAlpha(x - nSize / 2, y - nSize / 2, &tmp2, &r);
}

	void Redraw(bool forw)
	{
		m_pImage->clear(0xff80c0e0);

		// Draw the hill
		{
			int i, j;
			double x, y;
			for(i = 0; i < (int)m_pImage->width(); i++)
			{
				x = (double)i * 1.4 / m_pImage->width() - 0.4;
				y = x * x - x * x * x;
				j = (int)(m_pImage->height() - y * 3 * m_pImage->height() - 50);
				m_pImage->lineNoChecks(i, j, i, m_pImage->height() - 1, 0xff40a060);
			}
		}

		// Draw the car
		DrawCar();

		// Draw the acceleration arrow
		m_pImage->arrow(240, 20, 240 + (forw ? 15 : -15), 20, 0xff000000, 10);
	}

GImage* GPlotWindow::labelAxes(int maxHorizAxisLabels, int maxVertAxisLabels, int precision, float size, unsigned int color, double angle)
{
	int spacing = 10;
	int horizMargin = 200;
	int vertMargin = 200;
	GImage* pOutImage = new GImage();
	pOutImage->setSize(m_pImage->width() + horizMargin, m_pImage->height() + vertMargin);
	pOutImage->clear(0xffffffff);
	GRect r(0, 0, m_pImage->width(), m_pImage->height());
	pOutImage->blit(horizMargin, 0, m_pImage, &r);
	if(maxHorizAxisLabels > 0)
	{
		GPlotLabelSpacer spacer(m_window.x, m_window.x + m_window.w, maxHorizAxisLabels);
		for(int i = 0; i < spacer.count(); i++)
		{
			double pos = spacer.label(i);
			int x1, y1;
			windowToView(pos, 0, &x1, &y1);
			numericLabel(pOutImage, pos, horizMargin + x1, m_pImage->height() + spacing, precision, size, color, angle);
		}
	}
	else if(maxHorizAxisLabels == -1)
	{
		GPlotLabelSpacerLogarithmic spacer(m_window.x, m_window.x + m_window.w);
		while(true)
		{
			double pos;
			bool primary;
			if(!spacer.next(&pos, &primary))
				break;
			if(primary)
			{
				double x = log(pos);
				int x1, y1;
				windowToView(x, 0, &x1, &y1);
				numericLabel(pOutImage, pos, horizMargin + x1, m_pImage->height() + spacing, precision, size, color, angle);
			}
		}
	}
	if(maxVertAxisLabels > 0)
	{
		GPlotLabelSpacer spacer(m_window.y, m_window.y + m_window.h, maxVertAxisLabels);
		for(int i = 0; i < spacer.count(); i++)
		{
			double pos = spacer.label(i);
			int x1, y1;
			windowToView(0, pos, &x1, &y1);
			numericLabel(pOutImage, pos, horizMargin - spacing, y1, precision, size, color, 0.0);
		}
	}
	else if(maxVertAxisLabels == -1)
	{
		GPlotLabelSpacerLogarithmic spacer(m_window.y, m_window.y + m_window.h);
		while(true)
		{
			double pos;
			bool primary;
			if(!spacer.next(&pos, &primary))
				break;
			if(primary)
			{
				double y = log(pos);
				int x1, y1;
				windowToView(0, y, &x1, &y1);
				numericLabel(pOutImage, pos, horizMargin - spacing, y1, precision, size, color, 0.0);
			}
		}
	}
	return pOutImage;
}