76 lines
3.1 KiB
C
76 lines
3.1 KiB
C
#include "header.h"
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void three_point_beizerfan(Vector2 start, Vector2 mid, Vector2 end, Vector2* arr);
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struct squishy_square init_squishy_square(Rectangle *rect, Color color){
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struct squishy_square sqr = {
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.rect = rect,
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.color = color,
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.topleft = (Vector2){0,0},
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.topright= (Vector2){0,0},
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.bottomleft = (Vector2){0,0},
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.bottomright = (Vector2){0,0},
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.top_handle = (Vector2){0,0},
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.bottom_handle = (Vector2){0,0},
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.left_handle = (Vector2){0,0},
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.right_handle = (Vector2){0,0},
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.top_offset = 0.0,
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.bottom_offset = 0.0,
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.left_offset = 0.0,
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.right_offset = 0.0
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};
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return sqr;
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}
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void update_squishy(struct squishy_square *square){
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square->topleft.x = square->rect->x;
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square->topleft.y = square->rect->y;
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square->topright.x = square->rect->x + square->rect->width;
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square->topright.y = square->rect->y;
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square->bottomleft.x = square->rect->x;
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square->bottomleft.y = square->rect->y + square->rect->height;
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square->bottomright.x = square->rect->x + square->rect->width;
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square->bottomright.y = square->rect->y + square->rect->height;
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square->top_handle.x = square->rect->x + square->rect->width / 2;
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square->top_handle.y = square->rect->y;
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square->bottom_handle.x = square->rect->x + square->rect->width / 2;
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square->bottom_handle.y = square->rect->y + square->rect->height;
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square->left_handle.x = square->rect->x;
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square->left_handle.y = square->rect->y + square->rect->height / 2;
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square->right_handle.x = square->rect->x + square->rect->width;
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square->right_handle.y = square->rect->y+ square->rect->height / 2;
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}
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void draw_squishy(struct squishy_square *square){
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Vector2 center = (Vector2){
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.x = (square->topleft.x + square->topright.x)/2,
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.y = (square->topleft.y + square->bottomleft.y)/2
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};
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Vector2 vertices[BEZIER_POINTS+1];
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int i;
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three_point_beizerfan(square->topleft, square->top_handle, square->topright, vertices);
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for(i=0;i<BEZIER_POINTS;++i)
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DrawTriangle(vertices[i], center,vertices[i+1], square->color);
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three_point_beizerfan(square->topright, square->right_handle, square->bottomright, vertices);
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for(i=0;i<BEZIER_POINTS;++i)
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DrawTriangle(vertices[i], center,vertices[i+1], square->color);
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three_point_beizerfan(square->bottomright, square->bottom_handle, square->bottomleft, vertices);
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for(i=0;i<BEZIER_POINTS;++i)
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DrawTriangle(vertices[i], center,vertices[i+1], square->color);
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three_point_beizerfan(square->bottomleft, square->left_handle, square->topleft, vertices);
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for(i=0;i<BEZIER_POINTS;++i)
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DrawTriangle(vertices[i], center,vertices[i+1],square->color);
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}
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void three_point_beizerfan(Vector2 start, Vector2 mid, Vector2 end, Vector2* arr){
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double t;
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double t_prime;
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for (int i=0;i<=BEZIER_POINTS;++i){
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t = i*1.0/BEZIER_POINTS;
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t_prime = 1-t;
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arr[i].x = t_prime*t_prime*start.x + 2*t_prime*t*mid.x + t*t*end.x;
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arr[i].y = t_prime*t_prime*start.y + 2*t_prime*t*mid.y + t*t*end.y;
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}
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}
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