[shapes] Add shapes_rectangle_advanced example implementing a DrawRectangleRoundedGradientH function (#4435)
* [rshapes] Add function * "[shapes] rectangle advanced: fix screen width and height to fit with other examples"
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330
examples/shapes/shapes_rectangle_advanced.c
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330
examples/shapes/shapes_rectangle_advanced.c
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#include "raylib.h"
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#include "rlgl.h"
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#include <math.h>
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// Draw rectangle with rounded edges and horizontal gradient, with options to choose side of roundness
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// Adapted from both `DrawRectangleRounded` and `DrawRectangleGradientH`
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void DrawRectangleRoundedGradientH(Rectangle rec, float roundnessLeft, float roundnessRight, int segments, Color left, Color right)
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{
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// Neither side is rounded
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if ((roundnessLeft <= 0.0f && roundnessRight <= 0.0f) || (rec.width < 1) || (rec.height < 1 ))
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{
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DrawRectangleGradientEx(rec, left, left, right, right);
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return;
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}
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if (roundnessLeft >= 1.0f) roundnessLeft = 1.0f;
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if (roundnessRight >= 1.0f) roundnessRight = 1.0f;
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// Calculate corner radius both from right and left
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float recSize = rec.width > rec.height ? rec.height : rec.width;
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float radiusLeft = (recSize*roundnessLeft)/2;
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float radiusRight = (recSize*roundnessRight)/2;
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if (radiusLeft <= 0.0f) radiusLeft = 0.0f;
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if (radiusRight <= 0.0f) radiusRight = 0.0f;
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if (radiusRight <= 0.0f && radiusLeft <= 0.0f) return;
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float stepLength = 90.0f/(float)segments;
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/*
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Diagram Copied here for reference, original at `DrawRectangleRounded` source code
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P0____________________P1
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/| |\
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/1| 2 |3\
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P7 /__|____________________|__\ P2
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| |P8 P9| |
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| 8 | 9 | 4 |
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| __|____________________|__ |
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P6 \ |P11 P10| / P3
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\7| 6 |5/
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\|____________________|/
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P5 P4
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*/
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// Coordinates of the 12 points also apdated from `DrawRectangleRounded`
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const Vector2 point[12] = {
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// PO, P1, P2
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{(float)rec.x + radiusLeft, rec.y}, {(float)(rec.x + rec.width) - radiusRight, rec.y}, { rec.x + rec.width, (float)rec.y + radiusRight },
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// P3, P4
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{rec.x + rec.width, (float)(rec.y + rec.height) - radiusRight}, {(float)(rec.x + rec.width) - radiusRight, rec.y + rec.height},
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// P5, P6, P7
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{(float)rec.x + radiusLeft, rec.y + rec.height}, { rec.x, (float)(rec.y + rec.height) - radiusLeft}, {rec.x, (float)rec.y + radiusLeft},
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// P8, P9
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{(float)rec.x + radiusLeft, (float)rec.y + radiusLeft}, {(float)(rec.x + rec.width) - radiusRight, (float)rec.y + radiusRight},
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// P10, P11
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{(float)(rec.x + rec.width) - radiusRight, (float)(rec.y + rec.height) - radiusRight}, {(float)rec.x + radiusLeft, (float)(rec.y + rec.height) - radiusLeft}
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};
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const Vector2 centers[4] = { point[8], point[9], point[10], point[11] };
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const float angles[4] = { 180.0f, 270.0f, 0.0f, 90.0f };
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#if defined(SUPPORT_QUADS_DRAW_MODE)
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rlSetTexture(GetShapesTexture().id);
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Rectangle shapeRect = GetShapesTextureRectangle();
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rlBegin(RL_QUADS);
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// Draw all the 4 corners: [1] Upper Left Corner, [3] Upper Right Corner, [5] Lower Right Corner, [7] Lower Left Corner
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for (int k = 0; k < 4; ++k)
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{
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Color color;
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float radius;
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if (k == 0) color = left, radius = radiusLeft; // [1] Upper Left Corner
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if (k == 1) color = right, radius = radiusRight; // [3] Upper Right Corner
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if (k == 2) color = right, radius = radiusRight; // [5] Lower Right Corner
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if (k == 3) color = left, radius = radiusLeft; // [7] Lower Left Corner
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float angle = angles[k];
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const Vector2 center = centers[k];
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for (int i = 0; i < segments/2; i++)
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{
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rlColor4ub(color.r, color.g, color.b, color.a);
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rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(center.x, center.y);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(center.x + cosf(DEG2RAD*(angle + stepLength*2))*radius, center.y + sinf(DEG2RAD*(angle + stepLength*2))*radius);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(center.x + cosf(DEG2RAD*(angle + stepLength))*radius, center.y + sinf(DEG2RAD*(angle + stepLength))*radius);
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rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(center.x + cosf(DEG2RAD*angle)*radius, center.y + sinf(DEG2RAD*angle)*radius);
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angle += (stepLength*2);
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}
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// End one even segments
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if ( segments % 2)
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{
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rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(center.x, center.y);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(center.x + cosf(DEG2RAD*(angle + stepLength))*radius, center.y + sinf(DEG2RAD*(angle + stepLength))*radius);
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rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(center.x + cosf(DEG2RAD*angle)*radius, center.y + sinf(DEG2RAD*angle)*radius);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(center.x, center.y);
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}
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}
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//
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// Here we use the `Diagram` to guide ourselves to which point receives what color.
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//
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// By choosing the color correctly associated with a pointe the gradient effect
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// will naturally come from OpenGL interpolation.
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//
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// [2] Upper Rectangle
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[0].x, point[0].y);
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rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[8].x, point[8].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[9].x, point[9].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[1].x, point[1].y);
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// [4] Left Rectangle
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[2].x, point[2].y);
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rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[9].x, point[9].y);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[10].x, point[10].y);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[3].x, point[3].y);
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// [6] Bottom Rectangle
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[11].x, point[11].y);
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rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[5].x, point[5].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[4].x, point[4].y);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[10].x, point[10].y);
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// [8] left Rectangle
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[7].x, point[7].y);
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rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[6].x, point[6].y);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[11].x, point[11].y);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[8].x, point[8].y);
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// [9] Middle Rectangle
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlTexCoord2f(shapeRect.x/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[8].x, point[8].y);
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rlTexCoord2f(shapeRect.x/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[11].x, point[11].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, (shapeRect.y + shapeRect.height)/texShapes.height);
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rlVertex2f(point[10].x, point[10].y);
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rlTexCoord2f((shapeRect.x + shapeRect.width)/texShapes.width, shapeRect.y/texShapes.height);
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rlVertex2f(point[9].x, point[9].y);
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rlEnd();
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rlSetTexture(0);
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#else
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//
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// Here we use the `Diagram` to guide ourselves to which point receives what color.
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//
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// By choosing the color correctly associated with a pointe the gradient effect
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// will naturally come from OpenGL interpolation.
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// But this time instead of Quad, we think in triangles.
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//
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rlBegin(RL_TRIANGLES);
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// Draw all of the 4 corners: [1] Upper Left Corner, [3] Upper Right Corner, [5] Lower Right Corner, [7] Lower Left Corner
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for (int k = 0; k < 4; ++k)
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{
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Color color;
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float radius;
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if (k == 0) color = left, radius = radiusLeft; // [1] Upper Left Corner
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if (k == 1) color = right, radius = radiusRight; // [3] Upper Right Corner
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if (k == 2) color = right, radius = radiusRight; // [5] Lower Right Corner
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if (k == 3) color = left, radius = radiusLeft; // [7] Lower Left Corner
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float angle = angles[k];
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const Vector2 center = centers[k];
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for (int i = 0; i < segments; i++)
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{
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rlColor4ub(color.r, color.g, color.b, color.a);
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rlVertex2f(center.x, center.y);
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rlVertex2f(center.x + cosf(DEG2RAD*(angle + stepLength))*radius, center.y + sinf(DEG2RAD*(angle + stepLength))*radius);
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rlVertex2f(center.x + cosf(DEG2RAD*angle)*radius, center.y + sinf(DEG2RAD*angle)*radius);
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angle += stepLength;
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}
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}
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// [2] Upper Rectangle
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlVertex2f(point[0].x, point[0].y);
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rlVertex2f(point[8].x, point[8].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlVertex2f(point[9].x, point[9].y);
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rlVertex2f(point[1].x, point[1].y);
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlVertex2f(point[0].x, point[0].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlVertex2f(point[9].x, point[9].y);
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// [4] Right Rectangle
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlVertex2f(point[9].x, point[9].y);
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rlVertex2f(point[10].x, point[10].y);
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rlVertex2f(point[3].x, point[3].y);
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rlVertex2f(point[2].x, point[2].y);
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rlVertex2f(point[9].x, point[9].y);
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rlVertex2f(point[3].x, point[3].y);
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// [6] Bottom Rectangle
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlVertex2f(point[11].x, point[11].y);
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rlVertex2f(point[5].x, point[5].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlVertex2f(point[4].x, point[4].y);
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rlVertex2f(point[10].x, point[10].y);
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlVertex2f(point[11].x, point[11].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlVertex2f(point[4].x, point[4].y);
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// [8] Left Rectangle
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlVertex2f(point[7].x, point[7].y);
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rlVertex2f(point[6].x, point[6].y);
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rlVertex2f(point[11].x, point[11].y);
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rlVertex2f(point[8].x, point[8].y);
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rlVertex2f(point[7].x, point[7].y);
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rlVertex2f(point[11].x, point[11].y);
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// [9] Middle Rectangle
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlVertex2f(point[8].x, point[8].y);
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rlVertex2f(point[11].x, point[11].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlVertex2f(point[10].x, point[10].y);
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rlVertex2f(point[9].x, point[9].y);
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rlColor4ub(left.r, left.g, left.b, left.a);
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rlVertex2f(point[8].x, point[8].y);
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rlColor4ub(right.r, right.g, right.b, right.a);
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rlVertex2f(point[10].x, point[10].y);
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rlEnd();
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#endif
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}
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int main(int argc, char *argv[])
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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InitWindow(screenWidth, screenHeight, "raylib [shapes] example - rectangle avanced");
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SetTargetFPS(60);
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update rectangle bounds
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//----------------------------------------------------------------------------------
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double width = GetScreenWidth()/2.0, height = GetScreenHeight()/6.0;
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Rectangle rec = {
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GetScreenWidth() / 2.0 - width/2,
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GetScreenHeight() / 2.0 - (5)*(height/2),
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width, height
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};
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//--------------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(RAYWHITE);
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// Draw All Rectangles with different roundess for each side and different gradients
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DrawRectangleRoundedGradientH(rec, 0.8, 0.8, 36, BLUE, RED);
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rec.y += rec.height + 1;
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DrawRectangleRoundedGradientH(rec, 0.5, 1.0, 36, RED, PINK);
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rec.y += rec.height + 1;
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DrawRectangleRoundedGradientH(rec, 1.0, 0.5, 36, RED, BLUE);
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rec.y += rec.height + 1;
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DrawRectangleRoundedGradientH(rec, 0.0, 1.0, 36, BLUE, BLACK);
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rec.y += rec.height + 1;
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DrawRectangleRoundedGradientH(rec, 1.0, 0.0, 36, BLUE, PINK);
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EndDrawing();
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//--------------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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