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Fixed bezier line breaking #2735

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This commit is contained in:
nobytesgiven 2022-10-22 15:47:50 +03:00
parent 483f10397e
commit cd7048ffbd
1 changed files with 62 additions and 10 deletions
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72
src/rshapes.c
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@ -58,6 +58,7 @@
#include <math.h> // Required for: sinf(), asinf(), cosf(), acosf(), sqrtf(), fabsf()
#include <float.h> // Required for: FLT_EPSILON
#include <stdlib.h> // Required for: RL_FREE
//----------------------------------------------------------------------------------
// Defines and Macros
@ -196,7 +197,9 @@ void DrawLineBezier(Vector2 startPos, Vector2 endPos, float thick, Color color)
{
Vector2 previous = startPos;
Vector2 current = { 0 };
Vector2* pts = RL_MALLOC((2*BEZIER_LINE_DIVISIONS+2)*sizeof(Vector2));
for (int i = 1; i <= BEZIER_LINE_DIVISIONS; i++)
{
// Cubic easing in-out
@ -204,12 +207,27 @@ void DrawLineBezier(Vector2 startPos, Vector2 endPos, float thick, Color color)
current.y = EaseCubicInOut((float)i, startPos.y, endPos.y - startPos.y, (float)BEZIER_LINE_DIVISIONS);
current.x = previous.x + (endPos.x - startPos.x)/ (float)BEZIER_LINE_DIVISIONS;
// TODO: Avoid drawing the line by pieces, it generates gaps for big thicks,
// Custom "triangle-strip" implementation should be used, check DrawTriangleStrip() for reference
DrawLineEx(previous, current, thick, color);
double dy = current.y-previous.y;
double dx = current.x-previous.x;
double size = 0.5*thick/sqrt(dx*dx+dy*dy);
if (i==1) {
pts[0].x = previous.x+dy*size;
pts[0].y = previous.y-dx*size;
pts[1].x = previous.x-dy*size;
pts[1].y = previous.y+dx*size;
}
pts[2*i+1].x = current.x-dy*size;
pts[2*i+1].y = current.y+dx*size;
pts[2*i].x = current.x+dy*size;
pts[2*i].y = current.y-dx*size;
previous = current;
}
DrawTriangleStrip(pts, 2*BEZIER_LINE_DIVISIONS+2, color);
RL_FREE(pts);
}
// Draw line using quadratic bezier curves with a control point
@ -221,6 +239,8 @@ void DrawLineBezierQuad(Vector2 startPos, Vector2 endPos, Vector2 controlPos, fl
Vector2 current = { 0 };
float t = 0.0f;
Vector2* pts = RL_MALLOC((2*BEZIER_LINE_DIVISIONS+2)*sizeof(Vector2));
for (int i = 0; i <= BEZIER_LINE_DIVISIONS; i++)
{
t = step*i;
@ -232,12 +252,27 @@ void DrawLineBezierQuad(Vector2 startPos, Vector2 endPos, Vector2 controlPos, fl
current.y = a*startPos.y + b*controlPos.y + c*endPos.y;
current.x = a*startPos.x + b*controlPos.x + c*endPos.x;
// TODO: Avoid drawing the line by pieces, it generates gaps for big thicks,
// Custom "triangle-strip" implementation should be used, check DrawTriangleStrip() for reference
DrawLineEx(previous, current, thick, color);
double dy = current.y-previous.y;
double dx = current.x-previous.x;
double size = 0.5*thick/sqrt(dx*dx+dy*dy);
if (i==1) {
pts[0].x = previous.x+dy*size;
pts[0].y = previous.y-dx*size;
pts[1].x = previous.x-dy*size;
pts[1].y = previous.y+dx*size;
}
pts[2*i+1].x = current.x-dy*size;
pts[2*i+1].y = current.y+dx*size;
pts[2*i].x = current.x+dy*size;
pts[2*i].y = current.y-dx*size;
previous = current;
}
DrawTriangleStrip(pts, 2*BEZIER_LINE_DIVISIONS+2, color);
RL_FREE(pts);
}
// Draw line using cubic bezier curves with 2 control points
@ -249,6 +284,8 @@ void DrawLineBezierCubic(Vector2 startPos, Vector2 endPos, Vector2 startControlP
Vector2 current = { 0 };
float t = 0.0f;
Vector2* pts = RL_MALLOC((2*BEZIER_LINE_DIVISIONS+2)*sizeof(Vector2));
for (int i = 0; i <= BEZIER_LINE_DIVISIONS; i++)
{
t = step*i;
@ -260,12 +297,27 @@ void DrawLineBezierCubic(Vector2 startPos, Vector2 endPos, Vector2 startControlP
current.y = a*startPos.y + b*startControlPos.y + c*endControlPos.y + d*endPos.y;
current.x = a*startPos.x + b*startControlPos.x + c*endControlPos.x + d*endPos.x;
// TODO: Avoid drawing the line by pieces, it generates gaps for big thicks,
// Custom "triangle-strip" implementation should be used, check DrawTriangleStrip() for reference
DrawLineEx(previous, current, thick, color);
double dy = current.y-previous.y;
double dx = current.x-previous.x;
double size = 0.5*thick/sqrt(dx*dx+dy*dy);
if (i==1) {
pts[0].x = previous.x+dy*size;
pts[0].y = previous.y-dx*size;
pts[1].x = previous.x-dy*size;
pts[1].y = previous.y+dx*size;
}
pts[2*i+1].x = current.x-dy*size;
pts[2*i+1].y = current.y+dx*size;
pts[2*i].x = current.x+dy*size;
pts[2*i].y = current.y-dx*size;
previous = current;
}
DrawTriangleStrip(pts, 2*BEZIER_LINE_DIVISIONS+2, color);
RL_FREE(pts);
}
// Draw lines sequence