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Appendix A — The geometry in SWF — Gradient Fills

It is possible in SWF to use gradient fills. The gradient definitions are pretty raw and require you to draw large objects (that you can scale down later if you wish). A radial fill will usually be used to draw a round corner or a big & smooth dot. A linear fill can be used to draw objects which go from one color to another. The linear fill goes from left to right by default. It can be rotation as required though. Yet, in either case what is drawn in the shape object needs to be at the right scale and in the right direction. This may not always prove easy to deal with!

SWF Gradient Record (swf_gradient_record)

SWF Structure Info
Tag Flash Version: 
3
SWF Structure: 
struct swf_gradient_record {
	if(f_tag == DefineMorphShape || f_tag == DefineMorphShape2) {
		unsigned char	f_position;
		swf_rgba	f_rgba;
		unsigned char	f_position_morph;
		swf_rgba	f_rgba_morph;
	}
	else if(f_tag == DefineShape3 || f_tag == DefineShape4) {
		unsigned char	f_position;
		swf_rgba	f_rgba;
	}
	else {
		unsigned char	f_position;
		swf_rgb		f_rgb;
	}
};

The first record position should be 0 and the last 255. The intermediate should use the corresponding value depending on their position in the gradient effect.

SWF Line Style (swf_line_style)

SWF Structure Info
Tag Flash Version: 
1
SWF Structure: 
struct swf_line_style {
	if(f_tag == DefineMorphShape) {
		unsigned short twips	f_width;
		unsigned short twips	f_width_morph;
		swf_rgba		f_rgba;
		swf_rgba		f_rgba_morph;
	}
	else if(f_tag == DefineShape4 || f_tag == DefineMorphShape2) {
		unsigned short twips	f_width;
		if(f_tag == DefineMorphShape2) {
			unsigned short twips	f_width_morph;
		}
		unsigned		f_start_cap_style : 2;
		unsigned		f_join_style : 2;
		unsigned		f_has_fill : 1;
		unsigned		f_no_hscale : 1;
		unsigned		f_no_vscale : 1;
		unsigned		f_pixel_hinting : 1;
		unsigned		f_reserved : 5;
		unsigned		f_no_close : 1;
		unsigned		f_end_cap_style : 2;
		if(f_join_style == 2) {
			unsigned short fixed	f_miter_limit_factor;
		}
		if(f_has_fill) {
			swf_fill_style		f_fill_style;
		}
		else {
			swf_rgba		f_rgba;
			if(f_tag == DefineMorphShape2) {
				swf_rgba		f_rgba_morph;
			}
		}
	}
	else if(f_tag == DefineShape3) {
		unsigned short twips	f_width;
		swf_rgba		f_rgba;
	}
	else {
		unsigned short twips	f_width;
		swf_rgb				f_rgb;
	}
};

The width of the line is in TWIPS (1/20th of a pixel).

The f_start_cap_style and f_end_cap_style can be:

  • 0 - Round cap,
  • 1 - No cap,
  • 2 - Square cap.

Round is the default, the way line caps looked before version 8. No Cap means that nothing is added at the tip of the line. This means the line stops exactly where you say it should end. The Square Cap is like the No Cap, but it has the cap which is about Width / 2.

The f_join_style can be:

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