/*******************************************************************************************
*
* raylib [shapes] example - Rectangle advanced
*
* Example complexity rating: [★★★★] 4/4
*
* Example originally created with raylib 5.5, last time updated with raylib 5.5
*
* Example contributed by Everton Jr. (@evertonse) and reviewed by Ramon Santamaria (@raysan5)
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2024-2025 Everton Jr. (@evertonse) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#include "rlgl.h"
#include <math.h>
// Draw rectangle with rounded edges and horizontal gradient, with options to choose side of roundness
static void DrawRectangleRoundedGradientH(Rectangle rec, float roundnessLeft, float roundnessRight, int segments, Color left, Color right);
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [shapes] example - rectangle avanced");
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update rectangle bounds
//----------------------------------------------------------------------------------
float width = GetScreenWidth()/2.0f, height = GetScreenHeight()/6.0f;
Rectangle rec = {
GetScreenWidth() / 2.0f - width/2,
GetScreenHeight() / 2.0f - 5*(height/2),
width, height
};
//--------------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
// Draw All Rectangles with different roundess for each side and different gradients
DrawRectangleRoundedGradientH(rec, 0.8f, 0.8f, 36, BLUE, RED);
rec.y += rec.height + 1;
DrawRectangleRoundedGradientH(rec, 0.5f, 1.0f, 36, RED, PINK);
rec.y += rec.height + 1;
DrawRectangleRoundedGradientH(rec, 1.0f, 0.5f, 36, RED, BLUE);
rec.y += rec.height + 1;
DrawRectangleRoundedGradientH(rec, 0.0f, 1.0f, 36, BLUE, BLACK);
rec.y += rec.height + 1;
DrawRectangleRoundedGradientH(rec, 1.0f, 0.0f, 36, BLUE, PINK);
EndDrawing();
//--------------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
// Draw rectangle with rounded edges and horizontal gradient, with options to choose side of roundness
// NOTE: Adapted from both 'DrawRectangleRounded()' and 'DrawRectangleGradientH()' raylib [rshapes] implementations
static void DrawRectangleRoundedGradientH(Rectangle rec, float roundnessLeft, float roundnessRight, int segments, Color left, Color right)
{
// Neither side is rounded
if ((roundnessLeft <= 0.0f && roundnessRight <= 0.0f) || (rec.width < 1) || (rec.height < 1 ))
{
DrawRectangleGradientEx(rec, left, left, right, right);
return;
}
if (roundnessLeft >= 1.0f) roundnessLeft = 1.0f;
if (roundnessRight >= 1.0f) roundnessRight = 1.0f;
// Calculate corner radius both from right and left
float recSize = rec.width > rec.height ? rec.height : rec.width;
float radiusLeft = (recSize*roundnessLeft)/2;
float radiusRight = (recSize*roundnessRight)/2;
if (radiusLeft <= 0.0f) radiusLeft = 0.0f;
if (radiusRight <= 0.0f) radiusRight = 0.0f;
if (radiusRight <= 0.0f && radiusLeft <= 0.0f) return;
float stepLength = 90.0f/(float)segments;
/*
Diagram Copied here for reference, original at 'DrawRectangleRounded()' source code
P0____________________P1
/| |\
/1| 2 |3\
P7 /__|____________________|__\ P2
| |P8 P9| |
| 8 | 9 | 4 |
| __|____________________|__ |
P6 \ |P11 P10| / P3
\7| 6 |5/
\|____________________|/
P5 P4
*/
// Coordinates of the 12 points also apdated from `DrawRectangleRounded`
const Vector2 point[12] = {
// PO, P1, P2
{(float)rec.x + radiusLeft, rec.y}, {(float)(rec.x + rec.width) - radiusRight, rec.y}, { rec.x + rec.width, (float)rec.y + radiusRight },
// P3, P4
{rec.x + rec.width, (float)(rec.y + rec.height) - radiusRight}, {(float)(rec.x + rec.width) - radiusRight, rec.y + rec.height},
// P5, P6, P7
{(float)rec.x + radiusLeft, rec.y + rec.height}, { rec.x, (float)(rec.y + rec.height) - radiusLeft}, {rec.x, (float)rec.y + radiusLeft},
// P8, P9
{(float)rec.x + radiusLeft, (float)rec.y + radiusLeft}, {(float)(rec.x + rec.width) - radiusRight, (float)rec.y + radiusRight},
// P10, P11
{(float)(rec.x + rec.width) - radiusRight, (float)(rec.y + rec.height) - radiusRight}, {(float)rec.x + radiusLeft, (float)(rec.y + rec.height) - radiusLeft}
};
const Vector2 centers[4] = { point[8], point[9], point[10], point[11] };
const float angles[4] = { 180.0f, 270.0f, 0.0f, 90.0f };
#if defined(SUPPORT_QUADS_DRAW_MODE)
rlSetTexture(GetShapesTexture().id);
Rectangle shapeRect = GetShapesTextureRectangle();
rlBegin(RL_QUADS);
// Draw all the 4 corners: [1] Upper Left Corner, [3] Upper Right Corner, [5] Lower Right Corner, [7] Lower Left Corner
for (int k = 0; k < 4; ++k)
{
Color color;
float radius;
if (k == 0) color = left, radius = radiusLeft; // [1] Upper Left Corner
if (k == 1) color = right, radius = radiusRight; // [3] Upper Right Corner
if (k == 2) color = right, radius = radiusRight; // [5] Lower Right Corner
if (k == 3) color = left, radius = radiusLeft; // [7] Lower Left Corner
float angle = angles[k];
const Vector2 center = centers[k];
for (int i = 0; i < segments/2; i++)
{
rlColor4ub(color.r, color.g, color.b, color.a);
rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(center.x, center.y);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(center.x + cosf(DEG2RAD*(angle + stepLength*2))*radius, center.y + sinf(DEG2RAD*(angle + stepLength*2))*radius);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(center.x + cosf(DEG2RAD*(angle + stepLength))*radius, center.y + sinf(DEG2RAD*(angle + stepLength))*radius);
rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(center.x + cosf(DEG2RAD*angle)*radius, center.y + sinf(DEG2RAD*angle)*radius);
angle += (stepLength*2);
}
// End one even segments
if ( segments % 2)
{
rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(center.x, center.y);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(center.x + cosf(DEG2RAD*(angle + stepLength))*radius, center.y + sinf(DEG2RAD*(angle + stepLength))*radius);
rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(center.x + cosf(DEG2RAD*angle)*radius, center.y + sinf(DEG2RAD*angle)*radius);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(center.x, center.y);
}
}
// Here we use the 'Diagram' to guide ourselves to which point receives what color
// By choosing the color correctly associated with a pointe the gradient effect
// will naturally come from OpenGL interpolation
// [2] Upper Rectangle
rlColor4ub(left.r, left.g, left.b, left.a);
rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[0].x, point[0].y);
rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[8].x, point[8].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[9].x, point[9].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[1].x, point[1].y);
// [4] Left Rectangle
rlColor4ub(right.r, right.g, right.b, right.a);
rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[2].x, point[2].y);
rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[9].x, point[9].y);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[10].x, point[10].y);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[3].x, point[3].y);
// [6] Bottom Rectangle
rlColor4ub(left.r, left.g, left.b, left.a);
rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[11].x, point[11].y);
rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[5].x, point[5].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[4].x, point[4].y);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[10].x, point[10].y);
// [8] left Rectangle
rlColor4ub(left.r, left.g, left.b, left.a);
rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[7].x, point[7].y);
rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[6].x, point[6].y);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[11].x, point[11].y);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[8].x, point[8].y);
// [9] Middle Rectangle
rlColor4ub(left.r, left.g, left.b, left.a);
rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[8].x, point[8].y);
rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[11].x, point[11].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
rlVertex2f(point[10].x, point[10].y);
rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
rlVertex2f(point[9].x, point[9].y);
rlEnd();
rlSetTexture(0);
#else
// Here we use the 'Diagram' to guide ourselves to which point receives what color.
// By choosing the color correctly associated with a pointe the gradient effect
// will naturally come from OpenGL interpolation.
// But this time instead of Quad, we think in triangles.
rlBegin(RL_TRIANGLES);
// Draw all of the 4 corners: [1] Upper Left Corner, [3] Upper Right Corner, [5] Lower Right Corner, [7] Lower Left Corner
for (int k = 0; k < 4; ++k)
{
Color color = { 0 };
float radius = 0.0f;
if (k == 0) color = left, radius = radiusLeft; // [1] Upper Left Corner
if (k == 1) color = right, radius = radiusRight; // [3] Upper Right Corner
if (k == 2) color = right, radius = radiusRight; // [5] Lower Right Corner
if (k == 3) color = left, radius = radiusLeft; // [7] Lower Left Corner
float angle = angles[k];
const Vector2 center = centers[k];
for (int i = 0; i < segments; i++)
{
rlColor4ub(color.r, color.g, color.b, color.a);
rlVertex2f(center.x, center.y);
rlVertex2f(center.x + cosf(DEG2RAD*(angle + stepLength))*radius, center.y + sinf(DEG2RAD*(angle + stepLength))*radius);
rlVertex2f(center.x + cosf(DEG2RAD*angle)*radius, center.y + sinf(DEG2RAD*angle)*radius);
angle += stepLength;
}
}
// [2] Upper Rectangle
rlColor4ub(left.r, left.g, left.b, left.a);
rlVertex2f(point[0].x, point[0].y);
rlVertex2f(point[8].x, point[8].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlVertex2f(point[9].x, point[9].y);
rlVertex2f(point[1].x, point[1].y);
rlColor4ub(left.r, left.g, left.b, left.a);
rlVertex2f(point[0].x, point[0].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlVertex2f(point[9].x, point[9].y);
// [4] Right Rectangle
rlColor4ub(right.r, right.g, right.b, right.a);
rlVertex2f(point[9].x, point[9].y);
rlVertex2f(point[10].x, point[10].y);
rlVertex2f(point[3].x, point[3].y);
rlVertex2f(point[2].x, point[2].y);
rlVertex2f(point[9].x, point[9].y);
rlVertex2f(point[3].x, point[3].y);
// [6] Bottom Rectangle
rlColor4ub(left.r, left.g, left.b, left.a);
rlVertex2f(point[11].x, point[11].y);
rlVertex2f(point[5].x, point[5].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlVertex2f(point[4].x, point[4].y);
rlVertex2f(point[10].x, point[10].y);
rlColor4ub(left.r, left.g, left.b, left.a);
rlVertex2f(point[11].x, point[11].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlVertex2f(point[4].x, point[4].y);
// [8] Left Rectangle
rlColor4ub(left.r, left.g, left.b, left.a);
rlVertex2f(point[7].x, point[7].y);
rlVertex2f(point[6].x, point[6].y);
rlVertex2f(point[11].x, point[11].y);
rlVertex2f(point[8].x, point[8].y);
rlVertex2f(point[7].x, point[7].y);
rlVertex2f(point[11].x, point[11].y);
// [9] Middle Rectangle
rlColor4ub(left.r, left.g, left.b, left.a);
rlVertex2f(point[8].x, point[8].y);
rlVertex2f(point[11].x, point[11].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlVertex2f(point[10].x, point[10].y);
rlVertex2f(point[9].x, point[9].y);
rlColor4ub(left.r, left.g, left.b, left.a);
rlVertex2f(point[8].x, point[8].y);
rlColor4ub(right.r, right.g, right.b, right.a);
rlVertex2f(point[10].x, point[10].y);
rlEnd();
#endif
}