47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
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package pixel_test
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import (
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"fmt"
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"math"
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"testing"
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"github.com/faiface/pixel"
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)
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// closeEnough will shift the decimal point by the accuracy required, truncates the results and compares them.
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// Effectively this compares two floats to a given decimal point.
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// Example:
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// closeEnough(100.125342432, 100.125, 2) == true
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// closeEnough(math.Pi, 3.14, 2) == true
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// closeEnough(0.1234, 0.1245, 3) == false
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func closeEnough(got, expected float64, decimalAccuracy int) bool {
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gotShifted := got * math.Pow10(decimalAccuracy)
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expectedShifted := expected * math.Pow10(decimalAccuracy)
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return math.Trunc(gotShifted) == math.Trunc(expectedShifted)
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}
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type clampTest struct {
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number float64
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min float64
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max float64
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expected float64
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}
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func TestClamp(t *testing.T) {
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tests := []clampTest{
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{number: 1, min: 0, max: 5, expected: 1},
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{number: 2, min: 0, max: 5, expected: 2},
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{number: 8, min: 0, max: 5, expected: 5},
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{number: -5, min: 0, max: 5, expected: 0},
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{number: -5, min: -4, max: 5, expected: -4},
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}
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for _, tc := range tests {
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result := pixel.Clamp(tc.number, tc.min, tc.max)
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if result != tc.expected {
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t.Error(fmt.Sprintf("Clamping %v with min %v and max %v should have given %v, but gave %v", tc.number, tc.min, tc.max, tc.expected, result))
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}
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}
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}
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