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add a function(DrawEllipseRotation and DrawEllipseLinesRotation) to support drawing a rotated ellipse

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cmanlh 2024-10-30 20:29:02 +08:00
parent ffdce81678
commit 1f0153a2cb
2 changed files with 57 additions and 0 deletions
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2
src/raylib.h
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@ -1258,7 +1258,9 @@ RLAPI void DrawCircleV(Vector2 center, float radius, Color color);
RLAPI void DrawCircleLines(int centerX, int centerY, float radius, Color color); // Draw circle outline
RLAPI void DrawCircleLinesV(Vector2 center, float radius, Color color); // Draw circle outline (Vector version)
RLAPI void DrawEllipse(int centerX, int centerY, float radiusH, float radiusV, Color color); // Draw ellipse
RLAPI void DrawEllipseRotation(int centerX, int centerY, float radiusH, float radiusV, Color color, float angle); // Draw ellipse with rotation
RLAPI void DrawEllipseLines(int centerX, int centerY, float radiusH, float radiusV, Color color); // Draw ellipse outline
RLAPI void DrawEllipseLinesRotation(int centerX, int centerY, float radiusH, float radiusV, Color color, float angle); // Draw ellipse outline with rotation
RLAPI void DrawRing(Vector2 center, float innerRadius, float outerRadius, float startAngle, float endAngle, int segments, Color color); // Draw ring
RLAPI void DrawRingLines(Vector2 center, float innerRadius, float outerRadius, float startAngle, float endAngle, int segments, Color color); // Draw ring outline
RLAPI void DrawRectangle(int posX, int posY, int width, int height, Color color); // Draw a color-filled rectangle

55
src/rshapes.c
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@ -86,6 +86,7 @@ static Rectangle texShapesRec = { 0.0f, 0.0f, 1.0f, 1.0f }; // Texture source
// Module specific Functions Declaration
//----------------------------------------------------------------------------------
static float EaseCubicInOut(float t, float b, float c, float d); // Cubic easing
static Vector2 RotatePointAroundPoint(Vector2 point, Vector2 center, float angle); // Fetch new coordinates of a point after it rotates around a center point by a certain angle
//----------------------------------------------------------------------------------
// Module Functions Definition
@ -480,6 +481,25 @@ void DrawEllipse(int centerX, int centerY, float radiusH, float radiusV, Color c
rlEnd();
}
// Draw ellipse with rotation
void DrawEllipseRotation(int centerX, int centerY, float radiusH, float radiusV, Color color, float angle)
{
rlBegin(RL_TRIANGLES);
rlColor4ub(color.r, color.g, color.b, color.a);
Vector2 center = (Vector2){(float)centerX, (float)centerY};
Vector2 startPoint = RotatePointAroundPoint((Vector2){center.x + radiusH, center.y}, center, angle);
for (int i = 0; i < 360; i += 10)
{
Vector2 endPoint = RotatePointAroundPoint((Vector2){center.x + cosf(DEG2RAD*(i + 10))*radiusH, center.y + sinf(DEG2RAD*(i + 10))*radiusV}, center, angle);
rlVertex2f(center.x, center.y);
rlVertex2f(endPoint.x, endPoint.y);
rlVertex2f(startPoint.x, startPoint.y);
startPoint = endPoint;
}
rlEnd();
}
// Draw ellipse outline
void DrawEllipseLines(int centerX, int centerY, float radiusH, float radiusV, Color color)
{
@ -493,6 +513,24 @@ void DrawEllipseLines(int centerX, int centerY, float radiusH, float radiusV, Co
rlEnd();
}
// Draw ellipse outline with rotation
void DrawEllipseLinesRotation(int centerX, int centerY, float radiusH, float radiusV, Color color, float angle)
{
rlBegin(RL_LINES);
rlColor4ub(color.r, color.g, color.b, color.a);
Vector2 center = (Vector2){(float)centerX, (float)centerY};
Vector2 startPoint = RotatePointAroundPoint((Vector2){center.x + radiusH, center.y}, center, angle);
for (int i = 0; i < 360; i += 10)
{
Vector2 endPoint = RotatePointAroundPoint((Vector2){center.x + cosf(DEG2RAD*(i + 10))*radiusH, center.y + sinf(DEG2RAD*(i + 10))*radiusV}, center, angle);
rlVertex2f(startPoint.x, startPoint.y);
rlVertex2f(endPoint.x, endPoint.y);
startPoint = endPoint;
}
rlEnd();
}
// Draw ring
void DrawRing(Vector2 center, float innerRadius, float outerRadius, float startAngle, float endAngle, int segments, Color color)
{
@ -2411,4 +2449,21 @@ static float EaseCubicInOut(float t, float b, float c, float d)
return result;
}
// Fetch new coordinates of a point after it rotates around a center point by a certain angle
static Vector2 RotatePointAroundPoint(Vector2 point, Vector2 center, float angle)
{
// Vector center->point
float x = point.x - center.x;
float y = point.y - center.y;
// new vector after rotation
float cosres = cosf(angle);
float sinres = sinf(angle);
float newX = x*cosres - y*sinres;
float newY = x*sinres + y*cosres;
// new point
return (Vector2){newX + center.x, newY + center.y};
}
#endif // SUPPORT_MODULE_RSHAPES