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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** GUIX Component */ |
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/** */ |
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/** Canvas Management (Canvas) */ |
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/** */ |
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/**************************************************************************/ |
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#define GX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "gx_api.h" |
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#include "gx_system.h" |
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#include "gx_utility.h" |
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#include "gx_display.h" |
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#include "gx_canvas.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_canvas_polygon_draw PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Kenneth Maxwell, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This draws a polygon into the current context. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* point_array Array of points of the polygon*/ |
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/* terminated by NULL entry. */ |
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/* number_of_points Number of points of polygon */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* status Completion status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _gx_utility_rectangle_define Define a rectangle */ |
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/* _gx_utility_rectangle_overlap_detect Detect rectangle overlap */ |
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/* [gx_display_driver_polygon_draw] The display driver basic */ |
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/* polygon drawing routine */ |
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/* [gx_display_driver_polygon_fill] The display driver basic */ |
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/* polygon drawing routine */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application Code */ |
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/* */ |
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/**************************************************************************/ |
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UINT _gx_canvas_polygon_draw(GX_POINT *point_array, INT number_of_points) |
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{ |
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GX_DRAW_CONTEXT *context; |
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GX_DISPLAY *display; |
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GX_RECTANGLE bound; |
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GX_VIEW *view; |
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GX_RECTANGLE clip_rect; |
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INT i; |
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GX_VALUE left = point_array[0].gx_point_x; |
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GX_VALUE right = point_array[0].gx_point_x; |
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GX_VALUE top = point_array[0].gx_point_y; |
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GX_VALUE bottom = point_array[0].gx_point_y; |
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GX_VALUE width; |
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/* Calculate the minumum bounding rectangle. */ |
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✓✓ |
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for (i = 1; i < number_of_points; i++) |
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{ |
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✓✓ |
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if (point_array[i].gx_point_x < left) |
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{ |
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left = point_array[i].gx_point_x; |
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} |
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✓✓ |
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if (point_array[i].gx_point_x > right) |
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{ |
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right = point_array[i].gx_point_x; |
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} |
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✓✓ |
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if (point_array[i].gx_point_y < top) |
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{ |
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top = point_array[i].gx_point_y; |
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} |
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✓✓ |
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if (point_array[i].gx_point_y > bottom) |
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{ |
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bottom = point_array[i].gx_point_y; |
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} |
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} |
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/* pick up the current drawing context */ |
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context = _gx_system_current_draw_context; |
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width = (GX_VALUE)((context -> gx_draw_context_brush.gx_brush_width + 1) >> 1); |
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_gx_utility_rectangle_define(&bound, (GX_VALUE)(left - width), (GX_VALUE)(top - width), (GX_VALUE)(right + width), (GX_VALUE)(bottom + width)); |
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/* clip the polygon bounding box to the dirty rectangle */ |
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✓✓ |
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if (!_gx_utility_rectangle_overlap_detect(&bound, &context -> gx_draw_context_dirty, &bound)) |
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{ |
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/* nothing to draw, return */ |
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return GX_SUCCESS; |
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} |
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/* pick up current display driver */ |
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display = context -> gx_draw_context_display; |
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/* test to determine if the bounding rectangle overlaps the region we are allowed to draw |
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into. For each view that overlaps the bounding rectangle, do some drawing. |
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*/ |
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view = context -> gx_draw_context_view_head; |
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✓✓ |
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while (view) |
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{ |
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✓✓ |
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if (!_gx_utility_rectangle_overlap_detect(&view -> gx_view_rectangle, &bound, &clip_rect)) |
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{ |
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view = view -> gx_view_next; |
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continue; |
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} |
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/* we have a view into which we can draw the polygon, do it */ |
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GX_RECTANGLE *original_clip = context->gx_draw_context_clip; |
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context -> gx_draw_context_clip = &clip_rect; |
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✓✓ |
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if (context -> gx_draw_context_brush.gx_brush_style & (GX_BRUSH_SOLID_FILL | GX_BRUSH_PIXELMAP_FILL)) |
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{ |
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display -> gx_display_driver_polygon_fill(context, point_array, number_of_points); |
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} |
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✓✓ |
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if (display -> gx_display_driver_polygon_draw) |
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{ |
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/* Draw polygon. */ |
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display -> gx_display_driver_polygon_draw(context, point_array, number_of_points); |
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} |
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view = view -> gx_view_next; |
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context -> gx_draw_context_clip = original_clip; |
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} |
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/* Return successful completion. */ |
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return(GX_SUCCESS); |
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} |
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