Method run

test/cairoTest/cairoTest.cpp:416–440

// text align center
struct TestTextAlignCenter : public TestBase {
	virtual void run( fli::cairo::Context &ctx ) {
		const std::string text = "cairo";
		double x,y;

		ctx.selectFontFace( "Sans", fli::cairo::FONT_SLANT_NORMAL, fli::cairo::FONT_WEIGHT_NORMAL );

		ctx.setFontSize( 52.0 );
		fli::cairo::TextExtents extents = ctx.textExtents( text );
		x = 128.0 - ( extents.width() / 2 + extents.xBearing() );
		y = 128.0 - ( extents.height() / 2 + extents.yBearing() );

		ctx.moveTo( x, y );
		ctx.showText( text );

		// draw helping lines
		ctx.setSourceRgba( 1, 0.2, 0.2, 0.6 );
		ctx.setLineWidth( 6.0 );
		ctx.arc( x, y, 10.0, 0, 2 * M_PI );
		ctx.fill();
		ctx.moveTo( 128.0, 0 );
		ctx.relLineTo( 0, 256 );
		ctx.moveTo( 0, 128.0 );
		ctx.relLineTo( 256, 0 );
		ctx.stroke();
	}
};

// text extents