Polygons not working :(

[rohmer]

So, I have some code that is supposed to draw a vector compass.



I draw two circles, and that works fine.



Here is where the issue comes in when I try to do a polygon.  I have abstracted some of the GD library in a wrapper (To support different types of hardware).



So I initially thought it was that, but its not.



I stripped everything away and here is what I have:



GD.ColorRGB(0xf3d417);

Poly po;

po.begin();

/*

po.v(pt1.x * 16, pt1.y * 16);

po.v(pt2.x * 16, pt2.y * 16);

po.v(pt3.x * 16, pt3.y * 16);

*/

po.v(16 * 108, 16 * 100);

po.v(16 * 111, 16 * 105);

po.v(16 * 148, 16 * 100);

po.draw();





I get my circles (Eariler in the code), but this polygon refuses to show..



 I'm completely at a loss.

This is on an FT812, I assume polygons support 800x480 (Although the above doesnt have that resolution)

[jamesbowman]

I just tried this on an FT812 with the latest GD library:

#include <EEPROM.h>
#include <SPI.h>
#include <GD2.h>

void setup()
{
 GD.begin();
}

void loop()
{
 GD.ClearColorRGB(0x103000);
 GD.Clear();
 GD.ColorRGB(0xf3d417);
 Poly po;
 po.begin();
 po.v(16 * 154, 16 * 262);
 po.v(16 * 256, 16 * 182);
 po.v(16 * 312, 16 * 262);
 po.v(16 * 240, 16 *  10);
 po.draw();
 GD.swap();
}

It works fine -- could the earlier circles be somehow interfering with the polygon?

[rohmer]

Hmmm, Looking at the code, I had the following:
#ifdef FT81X
//GD.VertexFormat(2);
#endif

Removing that seems to have fixed the issue. When you hear hoofbeats think horses, I suppose

[rohmer]

One quick question, are Vertex2ii and Vertex2f universally interchangeable?

[jamesbowman]

GD.Vertex2ii(x, y, handle, cell)
is identical to:

GD.BitmapHandle(handle);
GD.Cell(cell);
GD.Vertex2f(16 * x, 16 * y);
And if you're drawing LINES or POINTS the bitmap handle and cell don't matter anyway.

And Vertex2ii doesn't allow subpixel coordinates, or coordinates outside 0-511.