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This thread is locked; no one can reply to it.
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| [A5] al_draw_filled_polygon don't work |
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SilverTES
Member #16,572
October 2016
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Hum, it's strange : 1
2...
3 std::vector<Vec2D> polygon0;
4
5 polygon0.push_back(Vec2D{100,100});
6 polygon0.push_back(Vec2D{120,100});
7 polygon0.push_back(Vec2D{160,140});
8 polygon0.push_back(Vec2D{130,160});
9 polygon0.push_back(Vec2D{80,140});
10
11
12 if (Collision2D::pointPolygon<Vec2D>(Point{(int)_xMouse, (int)_yMouse}, &polygon0[0], polygon0.size() ))
13 {
14 std::cout << "<-- Mouse in Polygon -->";
15
16 al_draw_filled_polygon // don't draw anything ! <-----
17 (
18 (float*)&polygon0[0],
19 polygon0.size(),
20 al_map_rgb(180,130,240)
21 );
22
23 al_draw_polygon // draw the polygon normally !
24 (
25 (float*)&polygon0[0],
26 polygon0.size(),
27 ALLEGRO_LINE_JOIN_BEVEL,
28 al_map_rgb(180,130,240),
29 4,
30 0
31 );
32 }
33...
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Polybios
Member #12,293
October 2010
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This could be the problem, although I'm not really sure about the order right now: Allegro manual said: When the y-axis is facing downwards (the usual), the coordinates must be ordered anti-clockwise.
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SilverTES
Member #16,572
October 2016
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I don't understand the problem.
, Thanks, it's working now ! 