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Minimum number of segments in circle sector functions changed from hard-coded to based on degree range. (#1707) 

Co-authored-by: Simon <simon@frithrah.com>
This commit is contained in:
frithrah 2021-04-06 13:29:58 +01:00 committed by GitHub
parent 109d00cb14
commit b2545e053a
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 22 additions and 10 deletions
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4
examples/shapes/shapes_draw_circle_sector.c
View File

@ -31,6 +31,7 @@ int main(void)
float startAngle = 0.0f;
float endAngle = 180.0f;
int segments = 0;
int minSegments = 4;
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
@ -64,7 +65,8 @@ int main(void)
segments = GuiSliderBar((Rectangle){ 600, 170, 120, 20}, "Segments", NULL, segments, 0, 100);
//------------------------------------------------------------------------------
DrawText(TextFormat("MODE: %s", (segments >= 4)? "MANUAL" : "AUTO"), 600, 200, 10, (segments >= 4)? MAROON : DARKGRAY);
minSegments = (int)ceilf((endAngle - startAngle) / 90);
DrawText(TextFormat("MODE: %s", (segments >= minSegments)? "MANUAL" : "AUTO"), 600, 200, 10, (segments >= minSegments)? MAROON : DARKGRAY);
DrawFPS(10, 10);

4
examples/shapes/shapes_draw_ring.c
View File

@ -33,6 +33,7 @@ int main(void)
float startAngle = 0.0f;
float endAngle = 360.0f;
int segments = 0;
int minSegments = 4;
bool drawRing = true;
bool drawRingLines = false;
@ -77,7 +78,8 @@ int main(void)
drawCircleLines = GuiCheckBox((Rectangle){ 600, 380, 20, 20 }, "Draw CircleLines", drawCircleLines);
//------------------------------------------------------------------------------
DrawText(TextFormat("MODE: %s", (segments >= 4)? "MANUAL" : "AUTO"), 600, 270, 10, (segments >= 4)? MAROON : DARKGRAY);
int minSegments = (int)ceilf((endAngle - startAngle) / 90);
DrawText(TextFormat("MODE: %s", (segments >= minSegments)? "MANUAL" : "AUTO"), 600, 270, 10, (segments >= minSegments)? MAROON : DARKGRAY);
DrawFPS(10, 10);

24
src/shapes.c
View File

@ -224,13 +224,15 @@ void DrawCircleSector(Vector2 center, float radius, float startAngle, float endA
endAngle = tmp;
}
if (segments < 4)
int minSegments = (int)ceilf((endAngle - startAngle)/90);
if (segments < minSegments)
{
// Calculate the maximum angle between segments based on the error rate (usually 0.5f)
float th = acosf(2*powf(1 - SMOOTH_CIRCLE_ERROR_RATE/radius, 2) - 1);
segments = (int)((endAngle - startAngle)*ceilf(2*PI/th)/360);
if (segments <= 0) segments = 4;
if (segments <= 0) segments = minSegments;
}
float stepLength = (endAngle - startAngle)/(float)segments;
@ -313,13 +315,15 @@ void DrawCircleSectorLines(Vector2 center, float radius, float startAngle, float
endAngle = tmp;
}
if (segments < 4)
int minSegments = (int)ceilf((endAngle - startAngle)/90);
if (segments < minSegments)
{
// Calculate the maximum angle between segments based on the error rate (usually 0.5f)
float th = acosf(2*powf(1 - SMOOTH_CIRCLE_ERROR_RATE/radius, 2) - 1);
segments = (int)((endAngle - startAngle)*ceilf(2*PI/th)/360);
if (segments <= 0) segments = 4;
if (segments <= 0) segments = minSegments;
}
float stepLength = (endAngle - startAngle)/(float)segments;
@ -456,13 +460,15 @@ void DrawRing(Vector2 center, float innerRadius, float outerRadius, float startA
endAngle = tmp;
}
if (segments < 4)
int minSegments = (int)ceilf((endAngle - startAngle)/90);
if (segments < minSegments)
{
// Calculate the maximum angle between segments based on the error rate (usually 0.5f)
float th = acosf(2*powf(1 - SMOOTH_CIRCLE_ERROR_RATE/outerRadius, 2) - 1);
segments = (int)((endAngle - startAngle)*ceilf(2*PI/th)/360);
if (segments <= 0) segments = 4;
if (segments <= 0) segments = minSegments;
}
// Not a ring
@ -547,13 +553,15 @@ void DrawRingLines(Vector2 center, float innerRadius, float outerRadius, float s
endAngle = tmp;
}
if (segments < 4)
int minSegments = (int)ceilf((endAngle - startAngle)/90);
if (segments < minSegments)
{
// Calculate the maximum angle between segments based on the error rate (usually 0.5f)
float th = acosf(2*powf(1 - SMOOTH_CIRCLE_ERROR_RATE/outerRadius, 2) - 1);
segments = (int)((endAngle - startAngle)*ceilf(2*PI/th)/360);
if (segments <= 0) segments = 4;
if (segments <= 0) segments = minSegments;
}
if (innerRadius <= 0.0f)