User:Hg200: Difference between revisions
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get (hax, "position"); | get (hax, "position"); | ||
In the following simplified code section | In the following simplified code section the matrix "x_projection" is assembled. It is used to scale the image of the above transformation into the bounding box of the window. For this purpose, the field of view (FOV) must be calculated: | ||
{{Code|Section of axes::properties::update_camera ()"|<syntaxhighlight lang="C" style="font-size:13px"> | {{Code|Section of axes::properties::update_camera ()"|<syntaxhighlight lang="C" style="font-size:13px"> | ||
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v_angle = get_cameraviewangle (); | v_angle = get_cameraviewangle (); | ||
// x_projection = diag([1, 1, 1, 1]) | |||
Matrix x_projection = xform_matrix (); | |||
// Calculate backwards from the angle to the ratio. This step | // Calculate backwards from the angle to the ratio. This step | ||
// is necessary because "v_angle" can be set manually. | // is necessary because "v_angle" can be set manually. | ||
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pix = (bb(2) < bb(3) ? bb(2) : bb(3)); | pix = (bb(2) < bb(3) ? bb(2) : bb(3)); | ||
// x_viewport = diag([1, 1, 1, 1]) | |||
Matrix x_viewport = xform_matrix (); | |||
// Move to the center of the bounding box inside the figure. | // Move to the center of the bounding box inside the figure. | ||
translate (x_viewport, bb(0)+bb(2)/2, bb(1)+bb(3)/2, 0); | translate (x_viewport, bb(0)+bb(2)/2, bb(1)+bb(3)/2, 0); | ||
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</syntaxhighlight>}} | </syntaxhighlight>}} | ||
Note: The | Note: The matrix just scales x, y so that the image fits tightly into the bounding box. The z-coordinate is not modified. | ||