Mercurial > hg > orthanc-stone

comparison Framework/Scene2D/Internals/CairoInfoPanelRenderer.cpp @ 1325:be17fed8c7c5 broker

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added flag in InfoPanelSceneLayer to apply the scene rotation to the displayed image.
author Benjamin Golinvaux <bgo@osimis.io>
date Tue, 24 Mar 2020 20:34:28 +0100
parents 2d8ab34c8c91
children
comparison
equal deleted inserted replaced
1324:4d8d642f7036 1325:be17fed8c7c5
32 const InfoPanelSceneLayer& l = dynamic_cast<const InfoPanelSceneLayer&>(layer); 32 const InfoPanelSceneLayer& l = dynamic_cast<const InfoPanelSceneLayer&>(layer);
33 33
34 texture_.Copy(l.GetTexture(), true); 34 texture_.Copy(l.GetTexture(), true);
35 anchor_ = l.GetAnchor(); 35 anchor_ = l.GetAnchor();
36 isLinearInterpolation_ = l.IsLinearInterpolation(); 36 isLinearInterpolation_ = l.IsLinearInterpolation();
37 applySceneRotation_ = l.ShouldApplySceneRotation();
37 } 38 }
38 39
39
40 void CairoInfoPanelRenderer::Render(const AffineTransform2D& transform, 40 void CairoInfoPanelRenderer::Render(const AffineTransform2D& transform,
41 unsigned int canvasWidth, 41 unsigned int canvasWidth,
42 unsigned int canvasHeight) 42 unsigned int canvasHeight)
43 { 43 {
44 int dx, dy; 44 int dx, dy;
45 InfoPanelSceneLayer::ComputeAnchorLocation( 45 InfoPanelSceneLayer::ComputeAnchorLocation(
46 dx, dy, anchor_, texture_.GetWidth(), texture_.GetHeight(), 46 dx, dy, anchor_, texture_.GetWidth(), texture_.GetHeight(),
47 canvasWidth, canvasHeight); 47 canvasWidth, canvasHeight);
48 48
49 cairo_t* cr = target_.GetCairoContext(); 49 cairo_t* cr = target_.GetCairoContext();
50
51 cairo_save(cr); 50 cairo_save(cr);
52 51
53 cairo_matrix_t t; 52 if (applySceneRotation_)
54 cairo_matrix_init_identity(&t); 53 {
55 cairo_matrix_translate(&t, dx, dy); 54 // the transformation is as follows:
56 cairo_transform(cr, &t); 55 // - originally, the image is aligned so that its top left corner
56 // is at 0,0
57 // - first, we translate the image by -w/2,-h/2
58 // - then we rotate it, so that the next rotation will make the
59 // image rotate around its center.
60 // - then, we translate the image by +w/2,+h/2 to put it
61 // back in place
62 // - the fourth and last transform is the one that brings the
63 // image to its desired anchored location.
57 64
65 int32_t halfWidth =
66 static_cast<int32_t>(0.5 * texture_.GetWidth());
67
68 int32_t halfHeight =
69 static_cast<int32_t>(0.5 * texture_.GetHeight());
70
71 AffineTransform2D translation1 =
72 AffineTransform2D::CreateOffset(-halfWidth, -halfHeight);
73
74 const Matrix& sceneTransformM = transform.GetHomogeneousMatrix();
75 Matrix r;
76 Matrix q;
77 LinearAlgebra::RQDecomposition3x3(r, q, sceneTransformM);
78
79 // first, put the scene rotation in a cairo matrix
80 cairo_matrix_t m;
81 cairo_matrix_init(
82 &m, q(0, 0), q(1, 0), q(0, 1), q(1, 1), q(0, 2), q(1, 2));
83
84 // now let's build the transform piece by piece
85 // first translation (directly written in `transform`)
86 cairo_matrix_t transform;
87 cairo_matrix_init_identity(&transform);
88 cairo_matrix_translate(&transform, -halfWidth, -halfHeight);
89
90 // then the rotation
91 cairo_matrix_multiply(&transform, &transform, &m);
92
93 // then the second translation
94 {
95 cairo_matrix_t translation2;
96 cairo_matrix_init_translate(&translation2, halfWidth, halfHeight);
97 cairo_matrix_multiply(&transform, &transform, &m);
98 }
99
100 // then the last translation
101 {
102 cairo_matrix_t translation3;
103 cairo_matrix_init_translate(&translation3, dx, dy);
104 cairo_matrix_multiply(&transform, &transform, &translation3);
105 }
106 cairo_transform(cr, &transform);
107 }
108 else
109 {
110 cairo_matrix_t t;
111 cairo_matrix_init_identity(&t);
112 cairo_matrix_translate(&t, dx, dy);
113 cairo_transform(cr, &t);
114 }
58 cairo_set_operator(cr, CAIRO_OPERATOR_OVER); 115 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
59 cairo_set_source_surface(cr, texture_.GetObject(), 0, 0); 116 cairo_set_source_surface(cr, texture_.GetObject(), 0, 0);
60 117
61 if (isLinearInterpolation_) 118 if (isLinearInterpolation_)
62 { 119 {